Many thanks for your quick reply which makes a lot of sense to me. But the file I’ve burned on the SD is named DexterOS-Image-1.0.3-Final.zip. It looks like it is the Raspbian image although the name tells a different story. I’ll give it another try after re-downloading it again and keep you informed.
Anyway, my first feeling about the GPG3 is quite positive WRT the hardware : the assembly went fine (despite some minor adjustments of the instructions about the right way to bolt the motors and their supports). The robot gives a good feeling of sturdiness.
The first experiments with the gopigo3 Python library gave positive results too… after a ‘git pull’ of the version included in the SD image : I initially got an import error of a mock_xxx module which was missing in the original version while playing with one of the examples, and the test application behave strangely (despite the printed message, the motors turned in one direction only). Scratch tests were not so fine, some of the actions selectable in the “broadcast” block having no effect. But since I played with Scratch before updating the gopigo3 Python library, maybe this is related. I’ll give it another try as soon as possible. It looks like the image I have used was not 100% production ready : the git status before doing the pull reported not committed local changes, and BTW it’s surprising having a library installed as a dev project.
Anyway I keep optimistic about the final verdict, and have the feeling the GPG3 could become one of the tools used in my robotics association for kids initiation to technology.