Troubleshooting

"No Waveshare adapter found" Is the USB cable plugged in? On Windows, the adapter should appear as a COM port in the Device Manager. If it doesn't, install the WCH CH343 driver.

"Could not open COM5: is ServoScope or another program using it?" Only one program can use the port. Disconnect in ServoScope, or close the other Python console that is still connected (bus.disconnect()).

"Could not open /dev/ttyACM0: no permission" On Linux, serial ports belong to the dialout group: sudo usermod -aG dialout $USER, then log out and in again.

"Motor 3 does not answer" Check the power supply (7.4 V) and the 3-pin cables, and whether the motor really has this ID (bus.scan()). If it happens only during fast moves, the supply is too weak: the voltage drops, the motor restarts and is silent for a moment.

"Garbled answer from motor 3" Electrical noise or a dip in the supply voltage. Check the cables and the power supply.

No motors found after connecting Is the power supply on? The USB cable alone does not power the motors.

The motor does not move Is torque on? Is the motor in the right mode for your command? Look at the status chip at the top of the motor page: "overload" or "overheat" means the motor protected itself. Switch torque off, let it cool down, and try again.

New motors all have ID 1 Connect them one at a time and give each a new ID first (ServoScope → Settings → Identity → id).

"Several devices have ID 1" Two devices on the cable have the same ID, e.g. two new motors. bus.scan() notices this and stops: every command would reach both of them, and their answers collide. Switch the power off, plug in only one of them, give it its own ID (bus[1].id = 2), then plug in the next one. If only one device has this ID, its answers were garbled: check the cables and the power supply.