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

==========================================================================

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

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

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