Arduino

[Six_Shooter]

Yep, plenty of this same idea floating around, many for OBDII. There is an OBD0 and OBD1 Honda display project that has been documented as well. The communication with the ECM is a little different, though similar to communication with a GM ECM. For the Honda the serial communications connects directly to the board in the ECM, that has separate tx and rx pins, and queries for each parameter, instead of being spit out in a stream it seems.

Speaking of Arduino, is it bad, that after doing 5 C programming labs at school (and several hours at home), that I want to end sentences with ";"? lol

[jim_in_dorris]

Probably not as bad as starting the sentences with ;

[FSJ Guy]

Speaking of Arduino, is it bad, that after doing 5 C programming labs at school (and several hours at home), that I want to end sentences with ";"? lol

Yes. And even worse that I thought it was funny, too. :D

[phonedawgz]

The MAX 232 circuit is used to convert a serial RS232 signal to ALDL. There are two parts to the circuit. The first is the MAX232 chip itself. The chip converts the RS232 signal to a TTL signal. Then from there the diode and resistor converts the TTL signal to the ALDL 8192 signal.

Since the Arduino pins are already a TTL type signal, there is no need to use the MAX232 chip. I don't believe you can get away with the simple diode/resistor interface to convert an Arduion TTL signal to the 8192 ALDL interface however.

I also don't believe you can get away with the 'just tie them together' trick to interface the TTL to 8192 ALDL either.

// idk maybe it was funny