we are hooking up the Polar Heart Rate monitor (HRMI) circuit from SparkFun and Dan Julio. We are trying to talk to it over I2C and have been at it for quite a few days with no success.
We have unsoldered SJ1 and soldered OP7 as directed to in the manual. We have also tried with and without external pull up resistors (I don't know if the JeeNode automatically has pull-ups or not). We have even tried soldeirng OP7 since the default address of 127 seems to be a reserved address in the I2C standard.
All with no luck. We get garbage back.
For wiring, we have:
Has anyone ever hooked up this circuit to a JeeNode before? We are trying to use the Ports library and the I2C functions since these are so easy to understand, but we have been trying every possible placement of device.stop() and device.send() and device.receive() calls since we don't quite know where they go for sure. We've gotten the TMP421 temperature chip working and have based our code off of that. I can post the code, but was just mainly interested if anyone else has ever done this, or if anyone sees any issue with the way we have the hardware configured.
thanks for any help!