Questions tagged [can]
CAN stands for Controller Area Network and is a bus often used in automotive applications. It is a two-wire differential protocol and works on baud rates from 10 kbits/sec to 1 Mbits/sec.
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5V CAN transceiver (TJA1040) with a 3.3V uController (ESP32)
I'm designing a CAN node using an ESP32, which works on 3.3V. The only transceiver I can find where I live at a reasonable cost is the TJA1040. The datasheet says it works both on 5V and 3.3V. I am ...
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Request for Review: First PCB Design - Feedback on Potential Issues or Missing Elements
I have recently designed my first PCB and I am seeking feedback on it to ensure there are no errors or missing elements. I have attached the schematic of my design. The PCB includes various components ...
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Swapping CANH and CANL kills my power converter
I got the first set of these CAN boards I designed and I plugged one into my test setup consisting of a two CAN dev boards as seen below. The first time I plugged my board in I didn't realize I had ...
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CAN Transmission not going through
I have a CAN bus set up, my two nodes are the STM32-F429ZIT dev board and a raspberry pi with RS485 CAN hat. I am trying to transmit from the STM32 to the raspberry pi. When I try to run this code, ...
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Hot pluggable CAN collections of devices
I'm trying to create a network of hot pluggable collections of iot devices into a bus (Containing Device 'A') that will always be present. There could be up to 50 collections with each collection ...
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How do I convert an I2S/TDM signal to a CAN signal
I'm getting output from the Analog Devices ADXL317 and I want to convert the output signal to a CAN signal. I don't think many CAN transceivers can take input from the I2S bus, so I need to find ...
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How may I manually construct CAN message for CANopen?
I understand CANopen uses CAN, the difference is usage and message type. I have basic CAN capable device and I want to control industrial motor controller, which uses CANopen.
I have its EDS file, but ...
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CAN BUS Chassis Grounding
Hoping to get get some guidance on correct grounding for a CAN Bus I have designed. The following diagram gives a high level overview of the system connectivity:
Some notes on the setup:
There are a ...
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UART communications using CAN bus differential signalling
I need to interface with a device that talks UART, but with CAN bus signalling. Here's a picture where a tester (which I want to replicate) talked to that device:
While RS485 seems similar, the ...
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How does CAN transceivers output CANH=3.5V and CANL=1.5V? [duplicate]
This is a questions that has been asked but did not find a clear answer. How it is the 3.5V achieved on CAN_H? Assuming there is 0.5V voltage drop on the internal diode, 0.1V on the internal MOSFET ...
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CAN bus accidentally swapped TX and RX is it possible to solve (in firmware) without board rework
I am interfacing an isolated can transceiver with my microcontroller. My schematic is given below.
Accidently TXD is connected to RXD of microcontroller and RXD is connected to TXD of the ...
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Add or remove 120 Ohm from the CAN circuit using Microcontroller
I want to design hardware circuit using microcontroller for CAN communication. One suggestion i require is i want to add 120 Ohm or remove it based on software configuration. I want to close the ...
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Adafruit Feather M4 CAN Express overvoltage protection
I would like to read CAN signals from my car over the OBD-II connector.
My question is, whether I need to implement any kind of (overvoltage) protection, so the Adafruit won't get harmed (and vica ...
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No connection between the steering wheel and the AgOpen controller with CAN
I'm developing the AgOpen navigation system for a tractor and I'm having trouble connecting the controller to the Keya steering wheel via CAN bus. Everything was working fine at home on the desk, but ...
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STM32G4 brings down CAN network when exposed to electrical noise
I have a CAN 2.0 network (classic can) running at 500 kb/s. I have multiple STM32F4 nodes running the stm32 HAL CAN driver with no issues. I have another node running a STM32G4 with a FDCAN driver ...
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