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| USB to CAN Converter |
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| afho:
Hello, this is my first real project i make in electronics design. It is a little USB to CAN converter you can plug to the USB-Port of your PC an to a CAN-Network (for example to trace the communication between ECUs in a modern car). I started the design by a little pcb witch i can etch an solder at home, so i used parts that i can handle easy. The case i choose is the case i want to use with the final design made in SMD. So here is my design! Please tell me all you think about it! I am very happy about constructive criticism! To my background: I am an software-engineer mainly developing software for embedded systems or test equipment. Developing electronics design is not my job at work, but i tryed to "keep my mind open". I have knowledge about electronics witch i need to develop software for embedded devices. Thanks. Alexander |
| charliex:
It's useful to add a switchable 120Ohm resistor to the CAN as some cars will need it to talk.. On my usb<>can i have it wired in permanently with a solder blob jumper thats normally closed if i want to remove it, |
| afho:
Hello, thanks for your reply! To add a 120Ohm resistor was a idea i also thought about, but i dont want to open the case to enable the resistor. A way to do this is by adding a relay, but this will make my design to big, and as a normal CAN-Node i dont need a resistor. The way i prefer to add a resistor to a CAN-Connection is by using a cable with an integrated resistor. How did you realize your usb<>can converter? Kind regards Alexander |
| charliex:
Well a dip switch works well too, I've found some cars work without it, others won't. I used an AT90CAN128 , FT232R and MCP2551 with a dataflash for some storage. |
| afho:
The AT90CAN128 has an external bus, where you connect the dataflash? What are your experience with the FT232R. My first idea was to make the converter simple with an FT245R, an SJA1000 and a MCP2551 so i dont need an microcontroller. RX and TX LEDs can directly connected to the RX and TX lines between the SJA and the MCP. But i have no experience with the chips from FTDI. |
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