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uPython-DHT22

This module provides a device driver for DHT22 (or DHT11 or AM2302) sensors on microPython board.

You can check more about these temperature and humidity sensors at the following page: http://www.adafruit.com/products/385

You can check more about the microPython project here: http://micropython.org/

Wiring

The basic wiring is designed to use no additional parts (like a pull-up resistor) and can be directly put to the microPython board. The wiring:

Sensor pin | board pin
-----------+----------
    VDD    |    Y1
    DTA    |    Y2
    NC     |    Y3
    GND    |    Y4

You can check photos, how it is plugged in at this page.

Installation

There are two files:

  • DHT22.py - the module implementing communication with the sensor
  • main.py - a sample file how to use the module (to use it you will need LCD panel installed)

The simplest installation way is to follow these steps (Linux):

  1. Connect your microPython board to your PC using a USB cable
  2. Mount the device pointing to the board (/dev/sdb1 in my case)
mkdir ~/tmp
sudo mount /dev/sdb1 ~/tmp
  1. copy DHT22.py and main.py files to the board
sudo cp DHT22.py main.py ~/tmp
  1. Unmount the device
sudo umount ~/tmp
  1. Restart your microPython board

uPython-DHT

universal library for DHT11, DHT21 and DHT22

Installation

There are one files:

  • dht.py - the module implementing communication with the sensor copy on the uPython.

Hardware

Sensor pin | board pin
-----------+----------
Pin1 VDD   | 3.3V
Pin2 DTA   | Y9 (or other Data-Pin)
Pin3 NC    | not conect
Pin4 GND   | GND

usage

on the console (Putty):

import dht
dht.init()

default-> timer_id = 2, data_pin = 'Y9', the_dhttype='DHT11'

dht.measure()

give the (humidity, temperature)

dht.hum()

give the humidity

dht.temp()

give the temperature