Repository information

This repository contains a modified driver for the DHT22 / AM2302 temperature and humidity sensors on Raspberry Pi.

Based on dht11.c: http://ubuntuone.com/6mT9cTREz90BUfvQD1AGNy (license unknown). Forked from the repository https://github.com/technion/lol_dht22.git Requires wiringPi library.

This version was created to make slight improvements which allow for a more reliable and faster reading with fewer delays.

Building

./configure
sudo make install

Running

Due to file locking and other aspects, super user access is required.

sudo kdht

Features

• Output temperature displayed in both Celsius and Fahrenheit.
• Faster read time than previous revisions.
• Identifies some invalid readings - out of range values ignored and confirmation when inconsistent values read.
• Lock files no longer prevent simultaneous reads to different pins.

Example output

sudo ./kdht 28 10
Reading DHT21/22 sensor on GPIO 28
10 attempts will be made.
Humidity = 62.10 % Temperature = 23.80 *C (74.84 *F)

Licence

As with previous licence: Public domain. Do what you want. No warranties.