garygid
Well-known member
A thread for DIY CAN-Capture Projects that do not use the AVR-CAN Development Board, but do use one of the Atmel AT90CAN128, 63, or 32 uP chips.
garygid said:Good thinking, it should make a good DIY project, but beyond most people's skills.
1. I think I also have a $13 JTAG programmer from ebay, if it actually works. If not, I believe there is another "tiny", low-cost, USB-to-JTAG programmer from SparkFun that will work. I have it on order.
2. Do you need to add the CAN transeiver as on the AVR-CAN board?
3. Do you need an RS232 level-generator & transeiver chip, with some caps?
4. The display needs to be mounted and its 4 + 8 = 12 lines connected to the uP board.
5. DB9F connector for the RS232 connection?
6. DB9M (or on-board holes) for connecting the four OBD cable wires?
7. Additional power regulator to handle the 14v from the car?
8. Will you make a daughter board to hold/do this stuff?
9. The labor to program, build, test, and assemble is fine for a skilled person's DIY Project, but might end up saving very little (or actually cost more) when producing a number of units, but still in low quantity.
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However, if you are serious about the project, we will watch and comment, if you wish.
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Moderator, please take my post and the previous one and start a "DIY AT90CAN CAN-Capture Project" thread. Thanks.
No, he's talking about integrating an Async to USB chip connected directly to the uC UART(s), then just having the USB connection available. It's handy because a mini or micro USB connector is nice and small, and PCs don't really have RS-232 ports anymore anyway. Plus he can skip the RS232 level shifter.garygid said:If you connect to the PC via USB, you will need some USB chip, and supporting firmware?
I decided to take advantage of the two on-chip UARTs in the AT90CAN128.
davewill said:No, he's talking about integrating an Async to USB chip connected directly to the uC UART(s), then just having the USB connection available. It's handy because a mini or micro USB connector is nice and small, and PCs don't really have RS-232 ports anymore anyway. Plus he can skip the RS232 level shifter.
garygid said:Good price, but what does in include, and
what does it take to program and load firmware into it?
garygid said:1. I think I also have a $13 JTAG programmer from ebay, if it actually works. If not, I believe there is another "tiny", low-cost, USB-to-JTAG programmer from SparkFun that will work. I have it on order.
lincomatic said:So do we just connect
(MCP2551 CANL -> DB9 pin 2) -> EV CAN-L (OBD-II 12)
(MCP2551 CANH -> DB9 pin 7) -> EV CAN-H (OBD-II 13)
evnow said:lincomatic said:So do we just connect
(MCP2551 CANL -> DB9 pin 2) -> EV CAN-L (OBD-II 12)
(MCP2551 CANH -> DB9 pin 7) -> EV CAN-H (OBD-II 13)
Yes - though most also connect ground and VIN for power.
garygid said:Baud rates?
Clock to uP or UART?
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