Raspberry Pi RPi Relay Board User Guide

Introduction

Raspberry Pi Expansion Board, Power Relay

Interface description

• Correspondence between relay channel and RPi Pin

Notices: The labels on the PCB are corresponding to the wiringPi code.

• Relay_JMP (6P jumpeer) usage:

Relay_JMP is the relay control pin selecting jumper. When this jumper is connected, the relay can be controlled by the Raspberry Pi.

• Relay screw terminal description:

This board integrates three screw terminals, and each has three pins for connecting external circuits.

All the terminals are low active. When the Raspberry Pi outputs Low Level from its IO, the LED related to the corresponding channel lights up. At the same time, the relay NO (normally open contacts) close and the NC (normally close contacts) open, so as to change the ON/OFF status of the external circuit.

(PS: Remember to connect the jumper Relay_JMP!)
Before the relay action:                   After the relay action:

Sample programs

The sample programs of this board include Shell, bcm2835, WiringPi, python and Webiopi.

Development environment

Before using this expansion board, you should install some libraries to Raspberry Pi, such as bcm2835, wiringPi and python. For more information about the installation and configuration of the RPi library functions, please refer to Libraries Installation for RPi.

tar -zxvf RPi_Relay_Board.tar.gz ~

chmod +x filename

Operations and results

Shell program

Enter the Linux terminal, and input the following line: Execute the code:

pi@raspberrypi ~/RPi_Relay_Board/shell $ sudo ./Relay.sh CH1 ON

Expected result: The LED of relay channel 1 is ON, and you can hear the relay closes. The two parameters at the end of this line are configurable. For example, when you change these parameters to CH2 ON, the relay 2 will connect; and then to CH3 OFF, the relay 3 will disconnect.

pi@raspberrypi ~/RPi_Relay_Board/shell $ sudo ./Relay.sh CH2 ON

pi@raspberrypi ~/RPi_Relay_Board/shell $ sudo ./Relay.sh CH3 OFF

Bcm2835 program

Compile the program:

pi@raspberrypi ~/RPi_Relay_Board/bcm2835 $ make

And execute the following line under the terminal:

pi@raspberrypi ~/RPi_Relay_Board/bcm2835 $ sudo ./Relay_Module

Expected result: Three LEDs light up by turns and the relays switch back and forth between the NC contacts and NO contacts by turns. In the meantime, the terminal will show the contacts that the current relay stays at.

Press the Keys Ctrl + C to end the program.

wiringPi program

Compile the program:

pi@raspberrypi ~/RPi_Relay_Board/wiringPi $ make

And execute the following line under the terminal:

pi@raspberrypi ~/RPi_Relay_Board/wiringPi $ sudo ./Relay_Module

Expected result: Three LEDs light up by turns and the relays switch back and forth between the NC node and NO node. In the meantime, the terminal will show the node that the current relay stays at.

Press the keys Ctrl + C to end the program.

Python program

Execute the following line under the terminal:

pi@raspberrypi ~/RPi_Relay_Board/python $ sudo python Relay_Module.py

Expected result: Three LEDs light up by turns and the relays switch back and forth between the NC node and NO node. In the meantime, the terminal will show the node that the current relay stays at.

Press the keys Ctrl + C to end the program.

Webiopi program

The webpage remote control in this sample program is based on the WebioPi software architecture to control the relay.

• Environment installation:

Enter the directory of Webiopi, and then unzip and install the library file.

pi@raspberrypi ~/RPi_Relay_Board/Webiopi $ tar -zxvf WebIOPi-0.7.1-raspi2.tar.gz

pi@raspberrypi ~/RPi_Relay_Board/Webiopi $ cd WebIOPi-0.7.1-raspi2

pi@raspberrypi ~/RPi_Relay_Board/WebioPi/WebIOPi-0.7.1-raspi2 $ sudo ./setup

webiopi -h

Enter the terminal, and execute the code:

pi@raspberrypi ~ $ sudo webiopi -d -c /etc/webiopi/config

Then, open the browser on your PC or cell phone, and enter the IP address of RPi into the address bar and end with the port number: 8000. For example, input http://192.168.1.16:8000/ (the address can be changeable according to your actual condition). To login the website, you should enter your account and password. The default account name is webiopi, and the original password is raspberry. When finished the steps above, if you can enter the webpage WebIOPi Main Menu, it means the environment is configured well.

• Operations and results:

Return to the terminal, and press the keys Ctrl + C to end the program. And then, execute the code:

cd ~/RPi_Relay_Board/Webiopi

pi@raspberrypi ~/RPi_Relay_Board/Webiopi $ sudo webiopi -d -c config

Then, open the browser on your PC or cell phone, and enter the IP address of RPi into the address bar and end with the port number: 8000. Or you can reload the webpage.

sudo webiopi -d -c config

After entering this webpage, you can control the relays by clicking the controls of different relay channels on the webpage.

• Schematic
• Demo Code
• Libraries Installation for RPi

3D Drawing

• RPi_Relay_Board_3D_Drawing
  

To：

Dear Customers, There may be a lag of several hours before we could process your order, depending on the time difference between your location and ours. Sincerely hoping your understanding!

Email(support)

services01@spotpear.com