MicroPython on NodeMCU for Temperature and Humidity logging

DIY, IoT Platform, , , , , , ,

This is basically cloud weather station, you can check data on your phone or use some phone as live display

With NodeMCU device you can log temperature and humidity data outside, in room, greenhouse, lab, cooling room or any other places completely free.

Device will be connected to internet via Wifi

You will be able to check latest readings on your mobile phone, desktop or any other device with browser

1. You need hardware parts to make logging device

You can purchase needed devices here (minimal required):

Also nice to have:

This also tested/works with industrial AM2305 sensor:

2. Add your device to LoggingPlatform

Here you can add your device to get api keys needed later: https://loggingforest.com/index.php/page/pricing

3. Hardware connection

Connect DHT22 Out to NodeMCU D2

Connect DHT22 + to NodeMCU 3V

Connect DHT22 – to NodeMCU GND

Diagram example:

4. Upload software needed to device (Windows Guide)

Connect device to USB on your Windows PC

Download and install Python here: https://www.python.org/downloads/

Download and run uPyCraft IDE tool to flash your NodeMCU here: uPyCraft.exe

Select COM port (this is usualy larger number if you don’t have other devices connected):

Burn microPython downloaded firmware to device

If you have pyBoard or device with preloaded firmware you can skip this step

Download MicroPython firmware for NodeMCU here: https://micropython.org/resources/firmware/esp8266-20190125-v1.10.bin

Upload LoggingForest basic code example to device

Download example code here: main.py

Use menu->Save page as or CTRL+S to download from this page main.py

Now open file in uPiCraft tool and change parameters received on loggingforest.com website:

Download and Run

After that your device will start sending data to loggingforest and you can see it there

In loggingforest device edit just define parameters name and values:

Click on preview:

And you will see nice data:

Feel free to comment and share your logger

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