The idea of this repo is to create a framework of some sort to easily add new sensors to my IOT network. You can see more info here, but the gist of it is:
- Written in MicroPython (sensors) and Python3 (services)
- Clients subscribe/publish to MQTT
- A daemon on a real box converts this to whatever protocol necessary
- You shouldn't need to write more than ~40 lines of code for your sensor
- OTA updates included
- Remote logging (simple messages sent via UDP)
- The program flow is an event loop; setup followed by loop()
- You have to set up your IRQ handlers during setup
- By providing a
HOSTNAMEfile you can set your device's name. It will be used for DHCP and MQTT topics.
ESP8266
esptool.py --port /dev/ttyUSB0 erase_flash
esptool.py --port /dev/ttyUSB0 write_flash -fs 2MB -fm dout 0x0 esp8266-20200911-v1.13.bin
ESP32
esptool.py --port /dev/ttyUSB0 erase_flash
esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x1000 esp32-idf4-20200902-v1.13.bin
Simply run ./server/OTA_sender.py --target NIGHTLAMP firmware/nightlamp/main.py --reboot to push main.py to the sensor NIGHTLAMP and reboot it.
This consists of a simple sensor (main.py) that reads from a DHT22 every 300s and publishes temperature and humidity data. Then the mqtt-influx service is in charge of POSTing that data to InfluxDB.
The code for a sensor that:
- Toggles a GPIO on button press
- Sets the GPIO state on an incoming MQTT message
- Publishes the button status (on change) to MQTT
is as trivial as:
def set_pin(pin, state):
pin(state)
common.publish(PUBTOPIC, str(pin()))
def sub_cb(topic, msg):
if msg == b'1':
set_pin(relay, True)
elif msg == b'0':
set_pin(relay, False)
else:
set_pin(relay, not relay())
@common.debounce(250)
def handle_button(pin):
set_pin(relay, not relay())
common.log('Someone pressed the button!')
def main():
setup_fns = [lambda: button.irq(handler=handle_button, trigger=Pin.IRQ_RISING),
lambda: led(1) # Turn off LED, it is inverted
]
common.loop(setup_fn=setup_fns, loop_fn=[], callback=sub_cb, subtopic=[SUBTOPIC])
main()(see nightlamp.py)
This is what's received by the remote logging server
22:32:12,488 - [ALL_CURTAINS]: Moving curtains up for 3 sec
22:32:33,769 - [ALL_CURTAINS]: Receiving OTA update..
22:32:33,781 - [ALL_CURTAINS]: ['192.168.2.189', '1233', 'main.py', '819d7bf839af03c912af6e81f65ab404e5915ab5', '1']
22:32:33,788 - [ALL_CURTAINS]: Target IP: 192.168.2.189, Target Port: 1233, Local filename: main.py, hash: 819d7bf839af03c912af6e81f65ab404e5915ab5
22:32:34,023 - [ALL_CURTAINS]: renaming tmp to main.py
22:32:34,183 - [ALL_CURTAINS]: Restarting, as requested by OTA (or default)
22:32:39,433 - [ALL_CURTAINS]: Connected to SSID!
22:32:39,643 - [ALL_CURTAINS]: Subscribing to b'ALL_CURTAINS/set/#'
22:32:39,772 - [ALL_CURTAINS]: Subscribing to b'ALL_CURTAINS/OTA'
22:32:41,927 - [ALL_CURTAINS]: Moving curtains down for 3 sec
22:32:44,935 - [ALL_CURTAINS]: Done
22:35:51,629 - [NIGHTLAMP]: Publish 24.30 to b'TEMP/NIGHTLAMP'
22:35:51,629 - [NIGHTLAMP]: Publish 48.30 to b'HUM/NIGHTLAMP'
22:40:51,660 - [NIGHTLAMP]: Publish 24.30 to b'TEMP/NIGHTLAMP'
22:40:51,660 - [NIGHTLAMP]: Publish 48.30 to b'HUM/NIGHTLAMP'
22:45:51,765 - [NIGHTLAMP]: Publish 24.10 to b'TEMP/NIGHTLAMP'
22:45:51,765 - [NIGHTLAMP]: Publish 49.20 to b'HUM/NIGHTLAMP'
22:50:51,805 - [NIGHTLAMP]: Publish 25.00 to b'TEMP/NIGHTLAMP'
22:50:51,806 - [NIGHTLAMP]: Publish 47.20 to b'HUM/NIGHTLAMP'