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bfitzy · 09-26-2022, 12:18 AM

Hey timurrrr,

After some time tinkering around I finally built this device and got it working via the OBD2 pins 6 and 14. It's freaking awesome! Since I've got it paired with RaceChrono, the device has been working well. I'm now in the process of creating a harness to connect to the CAN Bus access point behind the infotainment.

I have a couple questions though now that I've gotten this far.

1) I saw that you posted a TODO to get fuel remaining working on your GitHub readme. Doing some digging, I saw that you also posted in a RaceChrono forum showing the fuel remaining PID and equation. I can't seem to get this to work. I know the PID is 0x2129 or 8489 base ten as shown in RaceChrono. The equation I'm using is the same as you mentioned "A * 0.5". Any ideas? I can see that 0x2129 shows up in the received PIDs when looking at the serial monitor with a laptop connected, but no dice with RaceChrono. No data seems to be received for it. Every other data field seems to be working.

2) Is it required to use a 16MHz chip or will the 8MHz chip work fine? I understand that the clock will run half as slow and there's no reason not to run a 16MHz chip. I'm just frankly horrible at soldering and kept mucking up MCP2515 boards lol.

Thanks again!
Brad

09-26-2022, 12:18 AM	#17
bfitzy Junior Member Join Date: Oct 2021 Drives: 2013 Subaru BRZ Limited 6M Location: Ottawa Posts: 3 Thanks: 0 Thanked 4 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hey timurrrr, After some time tinkering around I finally built this device and got it working via the OBD2 pins 6 and 14. It's freaking awesome! Since I've got it paired with RaceChrono, the device has been working well. I'm now in the process of creating a harness to connect to the CAN Bus access point behind the infotainment. I have a couple questions though now that I've gotten this far. 1) I saw that you posted a TODO to get fuel remaining working on your GitHub readme. Doing some digging, I saw that you also posted in a RaceChrono forum showing the fuel remaining PID and equation. I can't seem to get this to work. I know the PID is 0x2129 or 8489 base ten as shown in RaceChrono. The equation I'm using is the same as you mentioned "A * 0.5". Any ideas? I can see that 0x2129 shows up in the received PIDs when looking at the serial monitor with a laptop connected, but no dice with RaceChrono. No data seems to be received for it. Every other data field seems to be working. 2) Is it required to use a 16MHz chip or will the 8MHz chip work fine? I understand that the clock will run half as slow and there's no reason not to run a 16MHz chip. I'm just frankly horrible at soldering and kept mucking up MCP2515 boards lol. Thanks again! Brad Last edited by bfitzy; 09-26-2022 at 12:32 AM.