3Pcs MCP2515 CAN Bus Module TJA1050 Receiver SPI Module for Arduino 51 MCU ARM Controller Development Board

These boards are set up so that two of them can function as "ends" on a can bus, so long as one puts a jumper at the J1 position on the board. That way you don't need to set up a twisted wire pair with resistors between each end of the twisted wires as well as connect more boards in the middle of the two ends.If using a bread board, you can use two lines on the bread board one for high and low. Connect the "end can modules with jumpers" to each end of line. Then connect can-boards *without jumpers* in the middle of each line. Great for prototyping how you want your data packets to look.I connected an arduino Uno, Arduino MKR1000 and a series of RPI picos to a can bus using these. Remember the jumper on the boards though!

Arrived on time, work great and good price. What else can you ask for?

At least one of the boards in my order arrived defective. Loopback mode worked, but it would not receive real data on a real CANbus. I tried to get it working for a few hours. Eventually I swapped to the second board I received in the order and it worked with the same software and the same settings.I am using one of these to listen in on the CANbus in my car, so I don't need a terminating resistor (or a jumper for the built in one). Once I swapped to a working board it did its job and gave me the data I needed.

Works perfectly, just note that the crystal is 8MHz and not 16MHz so the CNF settings need to be changed in your programs. Also, I unsoldered the 7 pin headers and soldered them to the bottom of the PCB so they work in solderless breadboards much better.My only recommendation to the seller/manufacturer is put the 7 pin headers on the bottom of the PCB.

These CAN bus adapters are meant to be used with 5 volts systems. Does not work with 3.3 volt systems. The differential line drivers are specified to work from 4.75 to 5.5 volts. The CAN controller can operate from 2.7 to 5.5 volts. It would have been more convenient if these CAN adapters were setup with jumpers for the power supply pins of the individuals ICs. This will allow you to select different power connections for the different ICs. These CAN adapters work fine if you only work with 5 volt systems.

If you get CAN INIT OK but no data, dont forget to change your code to reflect that this is an 8mhz board not 16mhz. FYI.

1 in 3 worked but I had to resolder the headers as were way out of line. 1 outright broken on CANbus. 1 worked but power LED bad.Wrote to seller asking to fix quality issues and sent 2 working replacements. They wrote back "I'm sorry to bring you the inconvenience. Here we sincerely apologize.We find that the order fulfilled by amazon,you can directly contact the amazon for new replacement."Note they don't address quality problem. I needed 3 working items. Now I have to return these 3 to get a refund or replacements - how many of those will work? What false economy, waste of time, money and enviro damage bc of terrible quality.

These worked just fine when I powered them from 5V. Initially powered from the 3.3V output from ESP32 board, but didn't work that. If you have trouble, switch to 5V (input/output signals can still be 3.3V level).