The ATTiny85 in the below circuit refuses to do anything.
$ avrdude -c usbtiny -p attiny85 avrdude: initialization failed, rc=-1 Double check connections and try again, or use -F to override this check. avrdude done. Thank you.
- Programmer: USBTiny ISP (Verified it works with an ATTiny with 0.1" pins in a breadboard that I could program just fine)
- Environment: avrdude via OSX
- Programmer interface: 6 header pins shoved into 6 pin ISP plug and inserted into offset programmer holes
- ATTiny chip is mounted in the correct orientation, the dot lines up where it should.
- Positive voltage (~4V from LiPo) exists between
GNDpins on the chip.
- All traces from the ISP holes to the chip pins are connected where they should be.
- Ceramic oscillator contacts connect with correct pins, and it's
- I can't find any shorts between discreet traces.
I've done everything I can think of and everything checks out. Except that my USBTinyISP programmer cannot talk to this chip. It acts as the programmer pins are not connected to anything.
Lastly, a previous iteration of this board seemed to work fine. That older board didn't include the LiPo charging circuit and it connected the ISP
5V+ pin to the power line (which shouldn't be required if the battery is powering the circuit).
- Could my chip be bad?
- What are the chances the ATTiny85 cap was put on backwards?
I'm out of troubleshooting ideas. What am I missing?