There something I need you guys to help.
I am working on air quality meansurement system.
The sensors I used are Co2 sensor, O2 senor, barometer, gps, leds, buzzer and xbee.
I connected all these sensors to Arduino uno and everything works well when i plug this to computer.
However when i used the battery that i have attached in the image, it cant work at all.
Can anyone help me? I really need you to help as this project deadline is coming.