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Onboard Interfaces

RPi

RPi Relay Board

Raspberry Pi Expansion Board, Power Relay

Primary Attribute

Category: Expansions, Raspberry Pi

Brand: Waveshare

RPi Relay Board

From Waveshare Wiki

Contents

1 Introduction

2 Interface description

3 Sample programs

3.1 Development environment

3.2 Operations and results

3.2.1 Shell program

3.2.2 Bcm2835 program

3.2.3 wiringPi program

3.2.4 Python program

3.2.5 Webiopi program

4 Resources

5 Support

Introduction

Raspberry Pi Expansion Board, Power Relay

Interface description

Correspondence between relay channel and RPi Pin

Channel No. RPi Pin No. wiringPi BCM Descriptions

CH1 37 P25 26 Channel 1

CH2 38 P28 20 Channel 2

CH3 40 P29 21 Channel 3

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

Summary of content (7 pages)

PAGE 1
RPi Relay Board From Waveshare Wiki Contents RPi Relay Board 1 Introduction 2 Interface description 3 Sample programs 3.1 Development environment 3.2 Operations and results 3.2.1 Shell program 3.2.2 Bcm2835 program 3.2.3 wiringPi program 3.2.4 Python program 3.2.
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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.
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chmod +x filename to grant the program the executable permission. 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.
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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.
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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, inputhttp://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.
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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. If you still cannot enter this webpage, we recommend you to use the Chrome browser or the Firefox browser. Furthermore, please make sure the current directory of Raspberry Pi is ~/RPi_Relay_Board/Webiopi , and there should be a file index.
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