RS485-CAN-HAT
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RS485 CAN HAT
RS485 CAN HAT is a multi node communication module, to communicate with devices in a long-range, designed dedicatedly for Raspberry Pi with an operating voltage of 3.3 V, CAN controller MCP2515 via SPI interface, onboard transceiver SN65HVD230 that is controlled via UART. It is built to support automatic TX/RX control without programming. It performs half-duplex communication and it has an onboard transceiver SP3485.
Features
- Onboard TVS (Transient Voltage Suppressor),lightning-proof & anti-electrostatic
- Standard Raspberry Pi 40 Pins GPIO Extension Headers
- Half-duplex Communication
- Long-Distance Communication via RS485/CAN functions
Specifications
- Operating voltage: 3.3V
- CAN transceiver: SN65HVD230
- RS485 transceiver: SP3485
- CAN controller: MCP2515
- Communication Protocol - RS485 and CAN
Buy it From : Click Here
Pinout
| Board PIN | Raspberry Pi GPIO (BCM) | DESCRIPTION |
|---|---|---|
| 3V3 | 3V3 | 3.3V Power |
| GND | GND | Ground |
| SCK | GPIO 11 | SPI clock input |
| MOSI | GPIO 10 | SPI data input |
| MISO | GPIO 9 | SPI data output |
| CS | GPIO 8 | SPI chip selection |
| INT | GPIO 25 | Interrupt |
| RXD | GPIO 15 | RS485 UART receive |
| TXD | GPIO 14 | RS485 UART transmit |
| RSE | GPIO 4 | RS485 TX/RX control Line (Currently in auto mode) |
Installation
Python
Library Installation
Before running this board you have install required libraries for RS485 CAN HAT.
- For Python3, install these two libraries by running below command on the terminal.
sudo apt-get install python-pip
sudo pip3 install python-can
CAN TEST
Required Hardware
- Raspberry Pi x 2
- RS485 CAN HAT x 2
Setup
- Stack RS485 CAN HAT on GPIO header of both Raspberry Pi, and modify the boot/config.txt file.
sudo nano /boot/config.txt
- Add below line to the end of the file.
dtparam=spi=on dtoverlay=mcp2515-can0,oscillator=12000000,interrupt=25,spimaxfrequency=2000000
- Save this file on both boards and reboot both raspberry pi one by one.
sudo reboot
- After restart, run the below command to verify the installation by running the below command (Make sure RS485 CAN HAT is connected while booting).
dmesg | grep -i '\(can\|spi\)'
Code Test
- Now connect H and L Terminal of the first HAT to H and L terminal of the second HAT.
- Clone or download Github repository by running below command.
git clone https://github.com/sbcshop/RS485-CAN-HAT.git
- Now enter cloned repository by running below command one by one.
cd RS485-CAN-HAT
cd CAN