I have been working with an Arduino TinkerKit SensorShield and the Gertduino.
It works, but programming the Gertduino with the TinkerKit shield in place doesn't work. The workaround I arrived at was to upload the sketch to the Gertduino, power down the Raspberry Pi, fit the TinkerKit shield and then power back up. I am assuming that this is a power issue because on the official Arduino Motor Shield, I get a similar situation but can work around it by powering the motor drive from a battery or external supply. Is this is a bad assumption or is the TinkerKit shield interfering with the IO used to BitBang the ATmega328p?
IF it is a PSU issue, how bad an idea would it be for me to connect the 5v supply pin to an external supply? I understand that the 5v supply on the Gertduino was not fitted because of worries about the heating effects of back-feeding (http://www.raspberrypi.org/phpBB3/viewt ... 1&p=467751).