I have a couples of problems with the GoPiGo, and I didn’t find any answers on the forum.
I’m using the Raspberry B+, but as I understand this shouldn’t be a problem.
First, even after the 1.3 update, the GoPiGo doesn’t drive forward straight, but it can go backwards straight without any problems.
And secondly, I can’t make the US sensor test programs to work. I use a HC-SR04 as a US sensor, pretty much the same as the one used in the tutorial as far as I can tell.
I checked the voltage of the pins of the A1 port directly with an oscilloscope, and there is no activity of any sort on 3 of the four pins. For the ground pin it is normal, for the other 2, I can’t see any commands of any kind (logic level is always 0). The Vcc pin is at a constant +5v.
The US sensor is working just fine, I tested it with the PI on its one, imprecise but working.