RPi Zero Relay

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RPi Zero Relay
RPi Zero Relay

Industrial 6-ch Relay Module for Raspberry Pi Zero
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Overview

Industrial 6-Channel Relay Module For Raspberry Pi Zero, RS485/CAN Bus, Power Supply Isolation, Photocoupler Isolation.

Features

  • RS485 half-duplex communication: using SP3485, UART control, auto RX/TX switch.
  • CAN half-duplex communication: using MCP2515 + SN65HVD230 solution, SPI control.
  • Onboard unibody power supply isolation, provides stable isolated voltage, needs no extra power supply for the isolated terminal.
  • Onboard photocoupler isolation, prevent interference from external high-voltage circuit connected to the relay.
  • Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, lightningproof & anti-electrostatic.
  • Onboard resettable fuses and protection diodes, ensuring current/voltage stable output, preventing over current/voltage, and better shock-resistance performance.
  • High-quality relay, contact rating: ≤10A 250V AC or ≤10A 30V DC.
  • ABS protection enclosure with rail-mount support, easy to install, safe to use.

Specifications

  • Supply voltage: 7V~36V
  • CAN control chip: MCP2515
  • CAN transceiver: SN65HVD230
  • 485 transceiver: SP3485
  • Product size: 123mm x 87.92mm
  • Fixed hole diameter: 3.5mm

Pinouts

  • CAN bus
PIN Raspberry Pi (BCM) Description
GND GND Ground
SCK SCK SPI clock input
MOSI MOSI SPI data input
MISO MISP SPI Data output
CS CE0 Data/Command Selection
INT 25 Interrupt output
  • RS485 bus
PIN Raspberry Pi (BCM) Description
GND GND Ground
RXD RXD UART receive
TXD TXD UART transimit
  • Relay interfaces
PIN Raspberry Pi (BCM) Description
GND GND Ground
IN_CH1 GPIO5 Relay Channel 1
IN_CH2 GPIO6 Relay Channel 2
IN_CH3 GPIO13 Relay Channel 3
IN_CH4 GPIO16 Relay Channel 4
IN_CH5 GPIO19 Relay Channel 5
IN_CH6 GPIO20 Relay Channel 6

Install libraries

  • BCM2835 libraries
wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.68.tar.gz
tar zxvf bcm2835-1.68.tar.gz 
cd bcm2835-1.68/
sudo ./configure && sudo make && sudo make check && sudo make install
  • Install wringPi
sudo apt-get install wiringpi
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
  • Python
sudo apt-get update
sudo apt-get install python-serial
sudo pip install python-can

Download Examples

Open a terminal and run the following commands to download the demo codes 

sudo apt-get install p7zip-full
wget https://www.waveshare.com/w/upload/2/2f/RPi_Zero_Relay_Code.7z
7z x RPi_Zero_Relay_Code.7z  -r -o./RPi_Zero_Relay_Code
sudo chmod 777 -R RPi_Zero_Relay_Code/

CAN Bus

Configuration

  • Modify the config.txt file
sudo nano /boot/config.txt
Add the fololwing lines to the config.txt file and save
dtparam=spi=on
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25,spimaxfrequency=3000000
  • Reboot
sudo reboot
  • Check if the driver is initalized normally
dmesg | grep -i '\(can\|spi\)'
The result should like the picture:
RS485 CAN HAT CAN1.png
If the MCP2515 driver is not initalized normall you need to reboot and check if the devices are connected properly (H to H and L to L).
RS485 CAN HAT CAN2.png

C examples

  • Run the receive example
cd ~/RPi_Zero_Relay_Code/CAN/wiringPi/receive/
make clean
make
sudo ./can_receive
After running the receive code, the terminal is waiting for data
RPi Zero Relay CAN 2.jpg
  • Run the Send examples:
cd RPi_Zero_Relay_Code/CAN/wiringPi/send/
make clean
make
sudo ./can_send
RPi Zero Relay CAN 1.jpg
Type data to send
RPi Zero Relay CAN 3.jpg
In the receive terminal, you will get the packet related to id.
RPi Zero Relay CAN 4.jpg

Python examples

  • Open a terminal and run the commands
cd RPi_Zero_Relay_Code/CAN/python/
#For receiving：
sudo python can_reveive.py
#For sending：
sudo python can_send.py

Connect to other CAN device

If you need to connect the RPi Zero Relay to other CAN devices, please note that:

  • Please check the connection, it should be H to H and L to L
  • Make sure that the baud rate of both sides are the same, the default baud rate of examples is 100K
  • Check if the CAN ID of both sides are the same
  • If data is always lost while transmitting, please decrease the baud rate and test it again.
RPi Zero Relay CAN 9.jpgRPi Zero Relay CAN 10.jpg

RS485 Interface

Configuration

  • Open a terminal and run the command
sudo raspi-config
Choose Interfacing Options -> Serial -> No -> Yes
Disable the login shell function and enable the hardware serial port.
  • Reboot
sudo reboot
  • Connect the device, A to A and B to B

C examples

  • Run the receive example
cd RPi_Zero_Relay_Code/485/WiringPi/send
make clean
make
sudo ./485_receive
After running the receive code, the terminal is waiting for data
RPi Zero Relay 485 2.jpg
  • Run the Send example
cd RPi_Zero_Relay_Code/485/WiringPi/send
make clean
make
sudo ./485_send
RPi Zero Relay 485 1.jpg
  • Input data and send:
RPi Zero Relay 485 3.jpg
  • The receive terminal recieve and print:
RPi Zero Relay 485 4.jpg

Python examples

Open a terminal and run the commands: 

cd RPi_Zero_Relay_Code/485/python/
#Receive example：
sudo python receive.py
#Send example：
sudo python send.py

Troubleshooting

If the RS485 cannot work normally, please check:

  • Please check if you have disabled the login shell function
  • Please check the connection, it should be A to A and B to B
  • Please test with USB to RS485, make sure that all the settings are correct.

Resource

Support

If you require technical support, please go to the Support page and open a ticket.

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