Install RPi relay board

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The Waveshare RPi Relay Board houses 3 relays controlled by Raspberry Pi General-Purpose Input/Outputs (GPIOs).

They can be controlled by:

WiringPi

Ckeck the download link.

Install the library:

su
cd /tmp/
wget http://www.waveshare.com/w/upload/f/f3/WiringPi.tar.gz
tar -xvzf WiringPi.tar.gz
cd wiringPi/
chmod 777 build
./build

Check the installation:

gpio -v

Test the relays:

PIN=25
gpio mode $PIN output ; gpio write $PIN 0 ; sleep 1 ; gpio write $PIN 1

for PIN in 25 28 29; do
  echo driving pin $PIN
  gpio mode $PIN output
  gpio write $PIN 0
  sleep 1
  gpio write $PIN 1
  sleep 1
done