I want to power up an Arduino UNO board independent of USB/laptop. I need to power it up from battery. I serialized 3 batteries 1.5V each, which results in 4.5 V, but the board won't light up. I connected the + from the serialized batteries to the VCC and the - to GND, but the it isn't working. Any ideas on how to power the board?
I attached the current connections of the Arduino. Apart from the batteries, I have 2 leds, connected to pins 2 and 4 and a DHT22 sensor connected to the 3rd pin.