Don McDonald

The motor wires are correct, the motor runs fine if the Arduino is powered through the USB plug. I am curious to know why the Arduino will not power the motor for the Test 4 sketch if the external power plug on the Arduino board is used instead of the USB plug. I assumed the Arduino would make use of the 12v if I plugged the power supply into the power plug on the Arduino board itself. You say the motor shield has to be powered with the 12v. I will try that. I will make sure that the power jumper...

Yes the power jumper on the motor shield is enabled, as in the photo you sent. Is there anything that has to be done to the Arduino board itself? I find it strange that the motor shield has power, as shown by the led light being on, but won't turn the motor on. Should I try disabling the power jumper and applying the external DC to the motor shield plug?

When I first put together the Arduino Uno and L293D motor shield I downloaded the Test 4 file to the Arduino to see if the motor(28BYJ-48) would turn. It did it's half turn left and half turn right as expected. This was using the USB plug to the laptop only. When I disconnected the USB cable and plugged in 9v to the external plug of the Arduino board the led on the motor shield came on but the motor did not turn. I found it strange that the motor shield obviously had power but the motor was not turning....

Yes works great now. Thanks

Hello to the Forum. I have had this focuser project in a drawer to use with a remote telescope setup for several years. With time on my hands due to Covid I decided to proceed with the project. I am using an L293D motor sheild on an Arduino Uno and a 28BYJ-48 motor. I programed it in the Arduino IDE with the Focuserv168_L293D_MT firmware and went through the setup in the Windows interface. It all works beautifully. However while the Windows program recognizes the temperature probe, and will return...