I2c, srf02, 16f688 -> ultrasonic rangefinder

[aratti]

Code seems OK, perhaps too short the delay between the write I2C command and the read

Did you place the pullup resistors on the SDA and SCL lines?

Cheers

Al.

[RussMartin]

Thanks, Al.

Code seems OK, perhaps too short the delay between the write I2C command and the read.

It's the same delay used by jellis00, but I think he was running 18F devices and I don't know at what speed. (Or if that would make a difference.)

Did you place the pullup resistors on the SDA and SCL lines?

Yes; per the SRF02 specifications recommendation, I used 1.8K (see the schematic).

Russ

[aratti]

Russ, I think your problem is in the this line of code:

SCL VAR PORTA.4 ' Serial clockS

PortA.4 is an open collector pin and I think not suitable for I2C comm.

Try to change pin.

Cheers

Al.