It is a power issue but not directly. When the P3 shield is not powered the control inputs are very low impedance and then you get exactly the problem I explained above. When there is power on the P3 motor shield the inputs become very high impedance and the problem goes away.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.
I assume this is the Tinkerkit: http://store.arduino.cc/product/T020010cmatthews wrote:The sensorshield works OK, it is just necessary to program the Gertduino without the shield in place. I never did get to the bottom of why this was the case. The Tinkerkit + Gertboard combination still offers a nice platform in terms of flexibility and ease of use, even with the slight inconvenience w.r.t. programming.
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