Try clicking the arrows which you have access to the H-Bridge. There are LEDs on it which should light up when the arrows are clicked. If they do but the motors do not move then it's either the motors not connected or the h-bridge incorrectly configured in ARC.

If they don't illuminate then the connections to the h-bridge are not connected.

Have you tried pressing the little White button on the H-Bridge and tried moving your Roli?

Also, are the ports you have the H-Bridge connected to configured correctly in the Movement Panel configuration menu? Also double check the H-Bridge wiring as well.

Hi @Rich, @SteveG, My robot is alive !

In fact I got two problems:

• a bad wiring on the H bridge,
• the S1 white button was not pressed !

I think it could be good to say that the S1 button must be pressed in the following tutorial. https://synthiam.com/Tutorials/Lesson/44?courseId=3

I will connect now the other elements (arms camera) and have fun ;-) Regards.

At least two people who had the mis-wired H-bridge like yours was the h_bridge burned out. If after following Rich's instructions for checking the H-bridge lights and Steve's instructions for checking the button it still doesn't work you may beed a warranty claim (use the Contact Us form).

Alan

I forgot to mention. My roli is rolling but it do not roll at constant speed.

I think the caterpillar are not really well adjusted, or the motor does not go at the same speed. I see the caterpillar is not taut.

Does there is a guide somewhere to adjust the caterpillar?

Regards

I did two modifications to make Roli roll better.

You can tighten the tread. First remove the treads. It will makke this easier. Flip Roli on his back, and you will see a screw right between the legs that hold the wheels. Loosen that screw and lift up the little plastic plate it holds down.

Gently pull one of the legs to the side until the gear teeth are free, rotate one notch towards the front (if working on the front wheels, towards the rear for the rear wheels) and push back in. Repeat on the other side, then do the same on the other set of wheels. Be careful with the back wheels since they have the motors, there are wires you don't want to pull too far.

Tighten the screw on the plastic plates. Roli will sit a little lower, but the tread will be tighter.

I found that wrapping the rear wheel with friction tape (available in the electric section of hardware store) or athletic tape (available in sports supply stores fir wrapping hockey stick and bat handles) before putting the tread back on also helped prevent slipping, particularly when turning on carpet or other high friction conditions.

Alan

Pleased you got Roli rolling. The little switch activates and deactivated the on-board +5v regulator on the H-Bridge. Easily overlooked. Also you can pad the wheels out with friction tape like this. and replace the track over it. That will give it better grip. I'm using something similar on my current project on a modified servo and wheel.

Thanks guys, it works fine now.