Pi4J :: Java I/O Library for Raspberry Pi :: Device :: DHT22

Uses SN74HC595 to update D0-D7 of the LCD display module

This repository contains device specific support for various devices.

This is an example implementation and will need to be adjusted to fit your needs.

Project by Tom Aarts

/**

If the commented use of the listener DataInGpioListener, this would
be a more normal implementation. However, the time to idle the gpio from output operation and
re-init the gpio as an input with a listener takes too long to complete
and DHT22 signals are lost and the device attempt to send data fails.
So, for the time being a simple polling implementation is used. */

https://www.sparkfun.com/datasheets/Sensors/Temperature/DHT22.pdf

Simple usage of the DHT22 Humidity and Temperature sensor.

Pi DHT22
5+ 1. VDD
GPIO 2. Data
Gnd 3. Ground

./mvnw clean package
cd target/distribution
sudo ./runDHT22.sh parms........

sudo ./runDHT22.sh -d 22 -t trace