Update: Wifi Scanner with ESP8266 + TFT ST7735B (NodeMCU)

I updated the lua code of the Wifi Scanner. It now runs with the sdk 3.0.1.

Migrate TTN-Gateway to The Things Stack Community Edition (aka V3)

 I just migrate my TTN-gateway to the new The Things Stack Community Edition (aka V3). 

I followed the instructions I found in the thread on GitHub.

1. Create a new gateway on the things network (link)
2. Change the server url in your local_conf.json to eu1.cloud.thethings.network
3. Restart the gateway

Unfortunately the new stack does not provide a NOC api - so my script to output the gateway status to a OLED stop working. I will invest into this next.

TTN-Gateway in a box

During the last days I worked on the installation of my TTN-Gateway into a case. This is the result:

Beside the LoraWAN hardware I have installed an OLED display and 3 sensors (1x Si7021, 2x DS18B20). The OLED display is connected via I2C, the sensors via 1-wire and I2C.

The sensor data is read by Python3 Script and published with MQTT. The OLED is also controlled by a Python3 script. Both scripts run as systemd-service.

The software is available on github.

Raspi + RAK831 + converter board - make standard i2c bus available

The RAK831 converter board connects the standard i2c pins of the Raspi with the RAK831 board (RASPI.PIN3 -> RAK.PIN7, RASPI.PIN5 -> RAK.PIN9) (see picture). The RAK831 documentation states the line(s ?) are used to enable the RFSW1012 (see page 15) but does not uses it as i2c bus. The consequence is that the standard i2c bus cannot be used.

On the other hand when looking how to connect the RAK831 direct with a Raspi (e.g. here) the RAK pins 7 and 9 are not used.

This means the i2c bus can be revitalize by removing the 0R bridges R11 and R6 on the converter board.

Setting up a Zigbee2mqtt gateway

Here are the steps I performed to setup a Zigbee2mqtt gateway using a CC2530+CC2591 board and a RaspberryPI 3.

• My RaspberryPI 3 is running

  pi@racknode:~ $ uname -a
  Linux racknode 4.19.42-v7+ #1219 SMP Tue May 14 21:20:58 BST 2019 armv7l GNU/Linux
  pi@racknode:~ $ hostnamectl
     Static hostname: racknode
           Icon name: computer
          Machine ID: confidential
             Boot ID: confidential
    Operating System: Raspbian GNU/Linux 9 (stretch)
              Kernel: Linux 4.19.42-v7+
        Architecture: arm

• My Zigbee board:
  
  
  
  
  

The steps can be structured in three groups:

1. Flash the Z-Stack coordinator firmware on the Zigbee board
2. Install zigbee2mqtt to run on the Raspberry Pi
3. Setup a daemon to run zigbee2mqtt

Flash the Z-Stack coordinator firmware on the Zigbee board

• Connect the Zigbee board with the Raspberry (Note: this is the connection schema for flashing the firmware, while normal operation another connection schema is used.)
  
  

  Name	Raspi	CC2530+CC2591*
  3,3V/VCC	Pin01	P12 Pin02
  GND	Pin39	P12 Pin01
  RESET	Pin35	P12 Pin03
  DC	Pin36	P14 Pin04
  DD	Pin38	P14 Pin05

  *) P12 - 12pin connector, P14 - 14 pin connector
  
  
  
  
  
  
  
  
  
  
• Install the wiringPI library
  

  sudo apt-get install wiringpi

• Install git

  pi@racknode:~ $ sudo apt-get install git
  

• Clone the flasher repo

  git clone https://github.com/jmichault/flash_cc2531.git

• Test the connection

  pi@racknode:~/flash_cc2531 $ ./cc_chipid
    ID = a524.

• Get the firmware - as mentioned above I need the CC2530+CC2591 version. See https://github.com/Koenkk/Z-Stack-firmware/tree/master/coordinator/Z-Stack_Home_1.2/bin/default for the correct version.

  pi@racknode:~/flash_cc2531 $ wget https://github.com/Koenkk/Z-Stack-firmware/raw/master/
  coordinator/Z-Stack_Home_1.2/bin/default/CC2530_CC2591_DEFAULT_20190608.zip

• Extract the archive

  pi@racknode:~/flash_cc2531 $ unzip CC2530_CC2591_DEFAULT_20190608.zip
  Archive:  CC2530_CC2591_DEFAULT_20190608.zip
    inflating: CC2530ZNP-Prod.hex
    inflating: CC2530ZNP-Prod.bin
  pi@racknode:~/flash_cc2531 $

• Erase the CC2531 CC2530

  pi@racknode:~/flash_cc2531 $ ./cc_erase
    ID = a524.
    erase result = 00a6.
  pi@racknode:~/flash_cc2531 $

• Write the new firmware (takes about 2-3 minutes)

  pi@racknode:~/flash_cc2531 $ ./cc_write CC2530ZNP-Prod.hex
    ID = a524.
    reading line 15490.
    file loaded (15497 lines read).
  writing page 128/128.
  verifying page 128/128.
   flash OK.
  pi@racknode:~/flash_cc2531 $ cd ..
  pi@racknode:~ $

Install zigbee2mqtt to run on the Raspberry Pi

Steps based on

• Connecting CC2530
• Running zigbee2mqtt

My steps were

• Connect the Zigbee board with the Raspberry for operation mode
  
  

  Name	Raspi	CC2530+CC2591*
  3,3V/VCC	Pin01	P12 Pin02
  GND	Pin39	P12 Pin01
  TX (R→Z)	Pin08	P12 Pin07
  RX (R←Z)	Pin10	P12 Pin08

  *) P12 - 12pin connector
  
  
  
  
  
  
  
  
  
• Enable UART and disable UART use for Bluetooth by adding following lines to /boot/config.txt

  pi@racknode:~ $ sudo vi /boot/config.txt
  
  enable_uart=1
  dtoverlay=pi3-disable-bt
  

• Disable modem system

  sudo systemctl disable hciuart

• Remove the serial console entry from /boot/cmdline.txt
  Before

  pi@racknode:~ $ cat /boot/cmdline.txt
  dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=...
  

  After

  pi@racknode:~ $ cat /boot/cmdline.txt
  dwc_otg.lpm_enable=0 console=tty1 root=...
  

• Reboot the Raspberry
• Installing the node.js 10.0 repo and install node.js

  pi@racknode:~ $ sudo curl -sL https://deb.nodesource.com/setup_10.x | sudo -E bash -

  ... and install node.js

  pi@racknode:~ $ sudo apt-get install -y nodejs

• Clone the zigbee2mqtt repo

  pi@racknode:~ $ sudo git clone https://github.com/Koenkk/zigbee2mqtt.git /opt/zigbee2mqtt

  ... and change own to pi

  pi@racknode:~ $ sudo chown -R pi:pi /opt/zigbee2mqtt

• Install the dependencies

  pi@racknode:~ $ cd /opt/zigbee2mqtt
  pi@racknode:/opt/zigbee2mqtt $ npm ci
  
  prebuild-install WARN install No prebuilt binaries found 
  (target=10.17.0 runtime=node arch=arm libc= platform=linux)
  make: Entering directory '/opt/zigbee2mqtt/node_modules/zigbee-herdsman/
  node_modules/@serialport/bindings/build'
    CXX(target) Release/obj.target/bindings/src/serialport.o
    CXX(target) Release/obj.target/bindings/src/serialport_unix.o
    CXX(target) Release/obj.target/bindings/src/poller.o
    CXX(target) Release/obj.target/bindings/src/serialport_linux.o
    SOLINK_MODULE(target) Release/obj.target/bindings.node
    COPY Release/bindings.node
  make: Leaving directory '/opt/zigbee2mqtt/node_modules/zigbee-herdsman/
  node_modules/@serialport/bindings/build'
  
  > serialport@8.0.1 postinstall /opt/zigbee2mqtt/node_modules/zigbee-herdsman/
  node_modules/serialport
  > node thank-you.js
  
  Thank you for using serialport!
  If you rely on this package, please consider supporting our open collective:
  > https://opencollective.com/serialport/donate
  
  
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9 (node_modules/
  zigbee-herdsman/node_modules/fsevents):
  npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for 
  fsevents@1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"arm"})
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9 (node_modules/
  fsevents):
  npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for 
  fsevents@1.2.9: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"arm"})
  
  added 1356 packages from 856 contributors and audited 877179 packages in 220.282s
  found 3 high severity vulnerabilities
    run `npm audit fix` to fix them, or `npm audit` for details

• Fix the mentioned issues

  pi@racknode:/opt/zigbee2mqtt $ npm audit fix
  npm WARN tsutils@3.17.1 requires a peer of typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || ↵
  >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta but ↵
  none is installed. You must install peer dependencies yourself.
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9 (node_modules/↵
  zigbee-herdsman/node_modules/fsevents):
  npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.9: ↵
  wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"arm"})
  npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.9 (node_modules/fsevents):
  npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.9: ↵
  wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"arm"})
  
  updated 2 packages in 52.752s
  fixed 3 of 3 vulnerabilities in 877319 scanned packages
  pi@racknode:/opt/zigbee2mqtt $
  

• Enter your configuration in /opt/zigbee2mqtt/data/configuration.yaml

  vi data/configuration.yaml

  Enter your settings 

  # MQTT settings
  mqtt:
    # MQTT base topic for zigbee2mqtt MQTT messages
    base_topic: zigbee2mqtt
    # MQTT server URL
    server: 'mqtt://localhost'
    # MQTT server authentication, uncomment if required:
    # user: my_user
    # password: my_password
  # CC2590 is connected to serial line
  serial:
    port: /dev/ttyAMA0
  advanced:
    baudrate: 115200
    rtscts: false 
  

• Start zigbee2mqtt

  pi@racknode:/opt/zigbee2mqtt $ npm start
  
  > zigbee2mqtt@1.7.1 start /opt/zigbee2mqtt
  > node index.js
  
  Logging to directory: '/opt/zigbee2mqtt/data/log/2019-11-30.16-53-43'
  Starting zigbee2mqtt version 1.7.1 (commit #b459c35)
  Starting zigbee-herdsman...
  zigbee-herdsman started
  Coordinator firmware version: '{"type":"zStack12","meta":{"transportrev":2,↵
  "product":0,"majorrel":2,"minorrel":6,"maintrel":3,"revision":20190608}}'
  Currently 0 devices are joined:
  `permit_join` set to  `true` in configuration.yaml.
  Allowing new devices to join.
  Set `permit_join` to `false` once you joined all devices.
  Zigbee: allowing new devices to join.
  Connecting to MQTT server at mqtt://xxx.xxx.xxx
  Connected to MQTT server
  MQTT publish: topic 'zigbee/bridge/state', payload 'online'
  MQTT publish: topic 'zigbee/bridge/config', payload '{"version":"1.7.1",↵
  "commit":"b459c35","coordinator":{"type":"zStack12","meta":{"transportrev":2,↵
  "product":0,"majorrel":2,"minorrel":6,"maintrel":3,"revision":20190608}},↵
  "log_level":"info","permit_join":true}'

Setup a daemon to run zigbee2mqtt

based on zigbee2mqtt - 5. (Optional) Running as a daemon with systemctl

• Create a zigbee2mqtt service

  sudo vi /etc/systemd/system/zigbee2mqtt.service

  enter

  [Unit]
  Description=zigbee2mqtt
  After=network.target
  
  [Service]
  ExecStart=/usr/bin/npm start
  WorkingDirectory=/opt/zigbee2mqtt
  StandardOutput=inherit
  StandardError=inherit
  Restart=always
  User=pi
  
  [Install]
  WantedBy=multi-user.target
  

• Verify that it works

  pi@racknode:/opt/zigbee2mqtt $ sudo systemctl start zigbee2mqtt
  pi@racknode:/opt/zigbee2mqtt $ sudo systemctl status zigbee2mqtt
  ● zigbee2mqtt.service - zigbee2mqtt
     Loaded: loaded (/etc/systemd/system/zigbee2mqtt.service; disabled; ↵
     vendor preset: enabled)

•    Active: active (running) since Tue 2019-12-03 08:35:46 CET; 7s ago
   Main PID: 626 (npm)
      Tasks: 23 (limit: 4915)
     CGroup: /system.slice/zigbee2mqtt.service
             ├─626 npm
             ├─643 sh -c node index.js
             └─644 node index.js
  
  Dec 03 08:35:46 racknode systemd[1]: Started zigbee2mqtt.
  Dec 03 08:35:50 racknode npm[626]: > zigbee2mqtt@1.7.1 start /opt/zigbee2mqtt
  Dec 03 08:35:50 racknode npm[626]: > node index.js
  Dec 03 08:35:53 racknode npm[626]: [..] Logging to directory: '/opt/zigb
  Dec 03 08:35:53 racknode npm[626]: [..] Starting zigbee2mqtt version 1.7
  Dec 03 08:35:53 racknode npm[626]: [..] Starting zigbee-herdsman...

• Configure the autostart of the service

  pi@racknode:/opt/zigbee2mqtt $ sudo systemctl enable zigbee2mqtt.service
  Created symlink /etc/systemd/system/multi-user.target.wants/zigbee2mqtt.service ↵
  → /etc/systemd/system/zigbee2mqtt.service.

• Reboot the Raspberry to verify your setup

  pi@racknode:/opt/zigbee2mqtt $ sudo reboot
  Connection to racknode closed by remote host.
  Connection to racknode closed.
  
  $ ssh pi@racknode
  Linux racknode 4.19.66-v7+ #1253 SMP Thu Aug 15 11:49:46 BST 2019 armv7l
  
  The programs included with the Debian GNU/Linux system are free software;
  the exact distribution terms for each program are described in the
  individual files in /usr/share/doc/*/copyright.
  
  Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
  permitted by applicable law.
  Last login: Tue Dec  3 08:42:26 2019 from 10.0.0.171
  pi@racknode:~ $ sudo journalctl -u zigbee2mqtt.service -f
  -- Logs begin at Thu 2016-11-03 18:16:43 CET. --
  [..] Started zigbee2mqtt.
  [..] > zigbee2mqtt@1.7.1 start /opt/zigbee2mqtt
  [..] > node index.js
  [..] Logging to directory: '/opt/zigbee2mqtt/data/log/2019-12-03.08-44-14'
  [..] Starting zigbee2mqtt version 1.7.1 (commit #b459c35)
  [..] Starting zigbee-herdsman...
  [..] zigbee-herdsman started
  [..] Coordinator firmware version: '{"type":"zStack12","meta":{"transportrev":2,↵
       "product":0,"majorrel":2,"minorrel":6,"maintrel":3,"revision":20190608}}'
  [..] Currently 1 devices are joined:
  [..] 0x00158d00029acb06 (0x00158d00029acb06): MFKZQ01LM - Xiaomi Mi/Aqara smart ↵
       home cube (EndDevice)
  [..] `permit_join` set to  `true` in configuration.yaml.
  [..] Allowing new devices to join.
  [..] Set `permit_join` to `false` once you joined all devices.
  [..] Zigbee: allowing new devices to join.
  [..] Connecting to MQTT server at mqtt://mqtt.thomo.de
  [..] Connected to MQTT server
  [..] MQTT publish: topic 'zigbee/bridge/state', payload 'online'
  [..] MQTT publish: topic 'zigbee/0x00158d00029acb06', payload '{"battery":31,↵
       "voltage":2825,"linkquality":18,"angle":10.55,"side":3}'
  [..] MQTT publish: topic 'zigbee/bridge/config', payload '{"version":"1.7.1",↵
       "commit":"b459c35","coordinator":{"type":"zStack12","meta":{"transportrev":2,↵
       "product":0,"majorrel":2,"minorrel":6,"maintrel":3,"revision":20190608}},↵
       "log_level":"info","permit_join":true}'
  ^C
  pi@racknode:~ $

Links

• https://www.zigbee2mqtt.io/

Update

2020-02-15: Fix error in flash connection table and picture.

Setup TTN Gateway using Raspi3 with RAK831 and converter board

Finally I was able to put my TTN Gateway into operation.

The first attempt a few month ago failed and therefore the project was on hold until now. An article in make 03/2019 gave me the impetus for a new attempt.

My essential setup steps:

1. Put the parts together.
   Caution: Do not power up the RAK831 card without connecting the antenna.
2. Prepare a SDCard with a Raspberry Image - I use "Raspbian Buster with desktop" (Release date: 2019-09-26, Kernel 4.19)
3. Perform a general update
   

   sudo apt-get update && sudo apt-get upgrade

4. Enable SPI using raspi-config
5. Clone the ttn gateway repo
   

   git clone https://github.com/ttn-zh/ic880a-gateway.git

6. Run the setup script
   

   cd ic880a-gateway
   sudo ./install.sh

7. Register the gateway on TTN website

After the restart I check the service status:

pi@ttn-gateway:~ $ systemctl status ttn-gateway
● ttn-gateway.service - The Things Network Gateway
   Loaded: loaded (/lib/systemd/system/ttn-gateway.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since Tue 2019-10-08 14:05:42 CEST; 779ms ago
  Process: 346 ExecStart=/opt/ttn-gateway/bin/start.sh (code=exited, status=1/FAILURE)
 Main PID: 346 (code=exited, status=1/FAILURE)

ttn-gw ttn-gateway[346]: INFO: Statusstream data is enabled
ttn-gw ttn-gateway[346]: INFO: Beacon is disabled
ttn-gw ttn-gateway[346]: INFO: Monitor is disabled
ttn-gw ttn-gateway[346]: INFO: Contact email configured to "my email"
ttn-gw ttn-gateway[346]: INFO: Description configured to "ttn-rak831"
ttn-gw ttn-gateway[346]: INFO: Successfully contacted server router.eu.thethings.network
ttn-gw ttn-gateway[346]: INFO: [main] Starting the concentrator
ttn-gw ttn-gateway[346]: ERROR: [main] failed to start the concentrator
ttn-gw systemd[1]: ttn-gateway.service: Main process exited, code=exited, status=1/FAILURE
ttn-gw systemd[1]: ttn-gateway.service: Failed with result 'exit-code'.

Damn - the same problem as at first try! :-(

An issue thread on github list some possible reasons, among other "the wiring might be wrong". You may also interpret it as "other then expected or as default" and this was the key. On another page about the setup I found the crucial clue: The converter board uses a different reset pin (it use pin 17 instead of 25).

After changing the corresponding setting in /opt/ttn-gateway/bin/start.sh

#! /bin/bash

# Reset iC880a PIN
# SX1301_RESET_BCM_PIN=25
SX1301_RESET_BCM_PIN=17
echo "$SX1301_RESET_BCM_PIN"  > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio$SX1301_RESET_BCM_PIN/direction

... it worked as expected. And I see the status "connected" on the TTN console (on TTN website).

To enable the GPS module I have to:

1. Disable the serial login shell but keep the serial interface enabled - via raspi-config - interface setup.
2. add the following lines to /opt/ttn-gateway/bin/local_conf.json
   

   "gps_tty_path": "/dev/ttyS0",
   "fake_gps": false,
   

3. Reboot and check if it works (it may take some minutes to fetch the GPS position)

   pi@ttn-gateway:/opt/ttn-gateway/bin $ sudo tail -f /var/log/syslog | grep -i gps
   Oct  8 17:55:36 ...: INFO: GPS serial port path is configured to "/dev/ttyS0"
   Oct  8 17:57:39 ...: INFO: GPS is enabled
   Oct  8 17:57:39 ...: INFO: Using real GPS if available.
   Oct  8 17:57:39 ...: INFO: [main] TTY port /dev/ttyS0 open for GPS synchronization
   Oct  8 17:57:39 ...: INFO: GPS thread activated.
   Oct  8 17:57:39 ...: WARNING: [gps] GPS out of sync, keeping previous time reference
   Oct  8 17:57:39 ...: WARNING: [gps] GPS out of sync, keeping previous time reference
   Oct  8 17:57:39 ...: WARNING: [gps] GPS out of sync, keeping previous time reference
   Oct  8 17:57:39 ...: WARNING: [gps] GPS out of sync, keeping previous time reference
   Oct  8 17:57:39 ...: ### [GPS] ###
   Oct  8 17:57:39 ...: # Valid gps time reference (age: 0 sec)
   Oct  8 17:57:39 ...: # System GPS coordinates: latitude 50.94322, longitude 7.37443, altitude 272 m
   Oct  8 17:57:39 ...: ### [GPS] ###
   Oct  8 17:57:39 ...: # Valid gps time reference (age: 0 sec)
   Oct  8 17:57:39 ...: # System GPS coordinates: latitude 50.94322, longitude 7.37443, altitude 274 m
   

Used hardware:

Raspi3

The converter board with GPS support

RAK831 module

On the left side: 

top - the TTN antenna

bottom - the GPS module (optional)

Connection of the GPS signal

Update: The wiring of the converter board is available on the RAK website.

Update: ESP8266 based SensorNode V2

I updated the circuit and pcb design of my Esp based SensorNode.

Further details in the github repository.

ESP Programmer

I put together an adapter board to attach a CP2104 board to ESP8266 and provide auto programming mode.

For further details see the github repository.

ESP8266 based SensorNode

In last weeks I put together a Sensor-Node based on ESP8266. The software part provides:

• the standard WiFiMonitor to setup the WiFi credentials
• a web page to configure the connected sensors
• a web service to read the configuration and current sensor values
• the data are published via MQTT in a format to be feed into a influxdb

The following sensors are supported:

• DS18B20 (multiple)
• BME280
• Si7021

SensorNode configuration page

I designed a board to be put into a USB port with a temperature and a humidity sensor. 

SensorNodeUSB circuit

SensorNodeUSB PCB bottom side

SensorNodeUSB PCB top side

More information can be found in the GitHub repo SensorNode.

Wifi Scanner with ESP8266 + TFT ST7735B (NodeMCU)

After successful connect the ESP8266 with the ST7735 display I want to do more than the demo - so here comes a Wifi Scanner.

Same hardware setup as in the previous blog post.

And here is the source code:

ESP8266 (NodeMCU) + 1.8 Inch TFT LCD Display Modul 128X160 SPI Serial ST7735B

Some notes how to connect a "1.8 Inch TFT LCD Display Modul 128X160 SPI Serial ST7735B IC SD Card für Arduino" to a ESP8266 running with NodeMCU.

You need a NodeMCU firmware with (at least) the modules bit and UCG (with st7735 display option).

NodeMCU custom build options.

[Update] Also SPI must be selected! (Thanks to Lorenz)

Pinout/Connection

The display has a 8-pin and 16-pin interface. The TFT interface in both are the same. You can choose either of the two interfaces for wiring.

     ESP8266 --             DISP             -- ESP8266
     OPTION 1                                   OPTION 2
                 --------------------------
                |      ST7735B 1.8 TFT     |
                |                          |
         GND -- | GND  (1)                 |
         3V3 -- | VCC  (2)                 |
                | NC   (3)                 |
         3V3 -- | BL   (4)         (1) RST | -- GPIO16 (D0)
                | NC   (5)         (2) CS  | -- GPIO15* (D8) 
GPIO16  (D0) -- | RST  (6) TFT     (3) D/C | -- GPIO02 (D4)
GPIO02  (D4) -- | RS   (7) TFT     (4) DIN | -- GPIO13 (D7)
GPIO13  (D7) -- | SDA  (8) TFT     (5) CLK | -- GPIO14 (D5)
GPIO14  (D5) -- | SCK  (9) TFT     (6) VCC | -- 3V3
GPIO15* (D8) -- | CS   (10)TFT     (7) BL  | -- 3V3
                | CLK  (11)SD      (8) GND | -- GND
                | MISO (12)SD              |
                | MOSI (13)SD              |
                | CS   (14)SD              |
                | NC   (16)                |
                | NC   (15)                |
                 --------------------------

*) pull-down 10k to GND

ESP8266 NodeMCU dev board connected to 16pin interface of TFT

ESP8266 NodeMCU dev board connected to 8pin interface of TFT

Test

I use the GraphicsTest.lua to test the connection. GraphicsTest is part of the NodeMCU examples (you have to upload also all GT_*.lua files to run the test).

Flash ESP8266-12/12E

Steps to flash new firmware:

1. (optional) Backup flash

   esptool.py --port port-of-esp8266 --baud 115200 read_flash 0x000 4194304 fw_backup.bin

2. Erase flash

   esptool.py --port port-of-esp8266 --baud 115200 erase_flash

3. Write esp init data (see SDK Init Data)

   esptool.py --port port-of-esp8266 --baud 115200 write_flash 0x3fc000 esp_init_data_default.bin

4. Write firmware

   esptool.py --port port-of-esp8266 --baud 115200 write_flash 0x0000 fw.bin

Notes about ESP8266-12/12e adapter plate

Below you see the "circuit" on the ESP8266-12/12e adapter board. 

ESP-01 + DHT22: Send data to influxdb

My first ESP-01 "system" is running now. It measures temperature and humidity using a DHT22 every 20 seconds and send the data to an influxdb database.

The influxdb is then used by a Grafana instance where I define a panel for the temperature and humidity. Here are the first measurements:

Looks like there where a glitch at about 12:30 - I will have a look how often this happen.
And here is the corresponding ESP code:

First Steps with ESP-01 on OS X El Capitan - Part 2

In part 1 I described how I setup my my environment. In this part I will show my first lua programming steps with the ESP8266 using the Lua based NodeMCU firmware.

First I create an init script (init.lua). This will be loaded by the firmware after each boot/restart.
As last step in the boot/restart process the firmware loads and executes the script init.lua (you can see a corresponding error message in the last screenshot in part 1).
It is recommended to provide an opportunity to interrupt the execution of init.lua to be able to change anything. Otherwise it may happen e.g. if your code contains a fatal error which cause a reboot that you are unable to deactivate/fix the code - and finally have to reflash the firmware to be break the loop.

I'm looking around an found a post about Methods of Interrupting init.lua during boot. My init.lua code based mainly on the ideas described there. But here it is:

1. it calls firmwareInfo() to output information about the firmware. For the moment it just inform if it is a FLOAT or INTEGER version
2. after a delay of BootTimeout ms (to give the NodeMCU some time to initialize it self) init() is called
3. in init() the serial port is initialized and configured to watch for a transmitted ENTER key
4. if an ENTER is received the function abort() is called, which set the abortFlag to true.
5. After AbortTimeoutms startup() is called. There the abortFlag is checked and the startup is canceled or executed by trying to load and execute 'user.lua'

The output of such a run without interrupt is shown below:

Next step was to wrote a script to read out a DHT22 sensor. The user_dht22.lua script shown below reads temperature and humidity every 2 sec and prints both values. Depending on the used firmware the output is generated using different format and in case of integer also further values.

Output running the script

First Steps with ESP-01 on OS X El Capitan

Environment: MacBook Pro Mid 2010, OS X El Capitan 10.11.4
ESP-01 Module + Simple DIY Dev Board (based on this)

1. Install esptool to backup/change/update ESP8266 firmware
1. Clone git repository https://github.com/themadinventor/esptool

   $ git clone https://github.com/themadinventor/esptool.git
   Cloning into 'esptool'...
   ...
   

2. cd esptool
3. run install routine

   $ sudo python setup.py install
   Password:
   running install
   ...
   Installing esptool.py script to /usr/local/bin
   

2. Connect ESP8266 ESP-01 Board via CH340G Converter to MBP
1. Install CH340G driver (WCH provides a signed driver)
2. Identify the tty port

   $ ls /dev/tty.w*
   /dev/tty.wchusbserial410

3. activate ESP boot loader (needs to be repeat before each esptool command) by reset ESP and pull GPIO 0 to GND meanwhile.
4. Check communication

   $ esptool.py --port /dev/tty.wchusbserial410 --baud 115200 flash_id
   Connecting...
   Manufacturer: c8
   Device: 4013
   
   $ esptool.py --port /dev/tty.wchusbserial410 --baud 115200 chip_id
   Connecting...
   Chip ID: 0x009b82bc
   
   

3. (optional) make a backup of the original firmware - takes about 48sec

   $ time esptool.py --port /dev/tty.wchusbserial410 --baud 115200 
   read_flash 0x000 524288 fw_backup.bin
   Connecting...
   Please wait...
   
   real 0m47.721s
   user 0m0.762s
   sys 0m0.344s
   

   (Note: ESP12-E has a bigger flash - 4MB = 4194304)
4. Flash alternative firmware - I want to give NodeMCU firmware a try
1. Use standard NodeMCU firmware (download from github) or
2. Config your own customized NodeMCU firmware 
3. Get the download links (integer and float version) about 2min later (you can also use the preconfigured
4. Flash it to the ESP-01 (I start with the integer version)

   $ time esptool.py --port /dev/tty.wchusbserial410 --baud 115200 
   write_flash 0x00000 nodemcu-master-9-modules-2016-03-29-19-22-38-integer.bin
   Connecting...
   Erasing flash...
   Took 1.22s to erase flash block
   Wrote 403456 bytes at 0x00000000 in 48.2 seconds (66.9 kbit/s)...
   
   Leaving...
   
   real 0m50.195s
   user 0m0.383s
   sys 0m0.126s
   

5. Connect to ESP. I use SerialTools (AppStore Link) - Note: Baud Rate is 76800
   

Setup/Configuration for another Magic Mirror

Note: Unfortunately, a glitch from the TV, which sometimes occurred before, seems now to be manifested. The TV doesn't power on anymore, neither using remote control nor buttons. I couldn't find a faulty component on TV circuit board. I will/have to stop this project. However, I have learned a lot, so it was not wasted time. 

General setup

• Raspberry PI 2
• SEG ArtColor TV 
• PIR module (GPIO 17, 18), IR transmitter (GPIO 4)

The PIR module will detect motion. If a motion is sense the TV will be switched on via the IR transmitter (simulation of IR remote). After a predefined timeout periode without further motion the TV will switched off (to standby).

Install and enable lirc

• install lirc

  sudo apt-get install lirc

• enable lirc module - edit /boot/config.txt

  dtoverlay=lirc-rpi,gpio_out_pin=4,gpio_in_pin=22

• configure lirc - edit /etc/lirc/hardware.conf

  LIRCD_ARGS=""
  ...
  DRIVER="default"
  DEVICE="/dev/lirc0"
  MODULES="lirc_rpi"
  

Setup IR command to power on/off the TV

• learn IR command

  irrecord -d /dev/lirc0 ~/lircd.conf

• copy new file

  sudo cp ~/lircd.conf /etc/lirc/lircd.conf

• edit the name parameter in /etc/lirc/lircd.conf I choose magicmirror
• start lirc

  pi@mamomami /etc/lirc $ sudo /etc/init.d/lirc start
  [ ok ] Loading LIRC modules:.
  [ ok ] Starting remote control daemon(s) : LIRC :.

• check if IR command is available

  pi@mamomami /etc/lirc $ irsend LIST "magicmirror" ""
  irsend: 00000000000043bc KEY_POWER
  

• run lirc service on start up

  sudo update-rc.d lirc defaults

Magic-Mirror: OpenWeatherMap Fix und TimeStamp bei den News

Wegen einer Änderung der API bei OpenWeatherMap bedurfte mein MagicMirror einer Wartung. Zum Glück waren die Änderungen gering: Beschrieben sind sie schon an anderer Stelle, daher hier nur ein Link auf eine Beschreibung in Deutsch und beim Magic-Mirror Autor.

Daneben habe ich die Gelegenheit gleich genutzt, um die Anzeige der News um die Angabe der Veröffentlichungszeit zu ergänzen. Das ganze sieht jetzt so aus:

Das GitHub Projekt ist entsprechend aktualisiert - wer will ... bitte schön.

Raspberry Pi - PIR Sensor

For my next project I want to detect movements and switch on/off something (or finally the monitor). Here is the experimental setup

• Raspberry Pi Rev2.0
• PIR sensor (connected to GPIO 4 + 17) - I use two pins because then I can assign a rising and falling edge event handler (see the code)
• 2x LED (connected to GPIO 24 + 25)
• 2x 100Ohm Resistor
• (also on the board but not yet in use: temperature sensor)

and the corresponding source code:
To start the script at boot time I use the following initd script:

Ring Clock

At end of 2014 I had enough time to finish my Ring Clock project (or at least push some steps forward).

I used a picture frame as casing. The passepartout serves as rack for the led ring. I have put a circle of red carton in the middle of the led ring. The carton masks the display board and contains a hole for the light sensor. Two thin carton frames act as spacer to put some distance between the glas plate and the led ring. A sheet of sandwich paper is used as diffusor.

The electronic part is assembled of a Arduino Pro Mini (Watterott), a DCF77 receiver (Pollin), a DS1307 RTC module (ebay), a DS18B20 temperature sensor (ebay), a light sensor (GL5528), a 8 digit display - using 8 old VQB18C modules and a driver (ebay) - and a 60 RGB led ring (Watterott).

The source code and further information can be found here.