Hi everyone, I have a line folllower robot already built. It has two motors and three infrared sensors(FC-51)
I am using an arduino UNO board stacked with a motor driver shield(L239D) to control the motors. I have two different power supllies: 11V to the motor driver shield(3X3.7V 18650 batteries) to power the shield and the motors, and I am powering the Arduino UNO through the USB port with a power bank.
With two different power supplies the car works fine. The 3X18650 batteries power the motors and the the power bank powers the three infrared sensors and the arduino UNO.
However I would like to power the arduino UNO and the sensors through a battery so I can get rid of the power bank, so I bought a 9V battery(6LR61) to power the arduino UNO and the sensors but when i connect the 9V battery to the arduino UNO DC jack, only the led on the UNO lights up and the sensors dont work. I am thinking of purchasing a 12V battery(a23) to connect to the DC jack on the arduino UNO, but I dont know if it is a good idea… I searched quite a bit and didn’t found anything that could help me.
Based on your experience do you think it would be a good idea to connect the 12V battery to the Arduino Uno DC jack? And will it have enough power to power my three infrared sensors?
Current Consumption of infrared sensor FC-51:
at 3.3V : ~23 mA
at 5.0V: ~43 mA
My scheme is also atached. In my scheme the arduino UNO is under the Shield conected to a usb cable.
Sorry for any errors, my main language isnt english.