https://github.com/costastf/temperature_sensor_mqtt

A micropython project for wemos d1 mini with wemos SHT30 sensor using mqtt as transport
https://github.com/costastf/temperature_sensor_mqtt

humidity micropython mqtt sht30 temperature wemos-d1-mini

Last synced: about 1 year ago
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A micropython project for wemos d1 mini with wemos SHT30 sensor using mqtt as transport

• Host: GitHub
• URL: https://github.com/costastf/temperature_sensor_mqtt
• Owner: costastf
• License: gpl-3.0
• Created: 2017-05-09T11:17:37.000Z (about 9 years ago)
• Default Branch: master
• Last Pushed: 2017-11-28T09:56:32.000Z (over 8 years ago)
• Last Synced: 2025-04-02T23:12:45.057Z (about 1 year ago)
• Topics: humidity, micropython, mqtt, sht30, temperature, wemos-d1-mini
• Language: Python
• Size: 20.3 MB
• Stars: 5
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Temperature and humidity measuring published on mqtt

A micropython project for wemos d1 mini with wemos SHT30 sensor using mqtt as transport

The implementation of the sensor is taken from here [SHT30](https://github.com/rsc1975/micropython-sht30) 

In order to use this an mqtt server must be set up. The one used for this 

project is [mosquitto](https://hub.docker.com/_/eclipse-mosquitto/) and has 

been setup to run on docker.

 

This project does not use authentication since it is build for a local deployment. If this does not 

work for you, edit accordingly. 

This assumes that you are using a linux box and was done on one running 

ubuntu.

# Physical Connection

The sensor is just stacked on top of the wemos d1. Keep in mind that it picks

 up temperature from the board so the reading is not true if used without 

 some form of insulation. Even with insulation the sensor picks up a lot of 

 heat from the board so the code puts the board in deepsleep instead of a 

 while loop. The board waking from deep sleep reconnects to the wifi, to the 

 mqtt sends the message, disconnects and sleeps again. For the board to wake 

 up from deep sleep a connection has to be made between gpio16 (D0) and RST.

 

# Configuration

 

 Rename configuration_sample.json to configuration.json and edit accordingly.

  Everything else should just work out of the box.

To load this project the wemos d1 needs to be running micropython and you 

could probably use ampy.

# Flashing micropython

Required tools:

    

   [esptool](https://github.com/espressif/esptool)    

   [micropython](http://micropython.org/download) # Firmware for ESP8266 

   boards, get latest.  

  

  

  With the board connected to a usb port of your linux box assuming that the 

  port is ttyUSB0 (check with dmesg after connecting to see what is assigned)

    

    esptool.py --port /dev/ttyUSB0 erase_flash

    esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect 0 esp8266-20170108-v1.8.7.bin

   

  I have had some d1 boards having trouble flashing with the above with 

  garbage on the serial and the led staying on. On those boards this command 

  works.

    

    esptool.py --port /dev/ttyUSB0 write_flash -fm dio -fs 32m 0 esp8266-20170108-v1.8.7.bin

   

   

# Loading the project

Required tools:

   [ampy](https://github.com/adafruit/ampy)

   

    export AMPY_PORT=/dev/ttyUSB0

    ampy put drivers/

    ampy put configuration.json 

    ampy put main.py 

    ampy put boot.py 

# Checking output

   On an ubuntu box you can install mosquitto clients with:

    

    sudo apt-get install mosquitto-clients

    

   For other distros or platforms please search what is required.

   Checking messages:

   

    mosquitto_sub -h MQTT_SERVER_IP -v -t "CONFIGURED_TOPIC"

    

   should show something like this every however long the configuration is 

   set to:

    

    CONFIGURED_TOPIC {"humidity": 27.65392, "temperature": 27.68366}