Arduino Uno with HC-SR04 Power saving My Arduino Uno is powered by 9v battery to run 2 ultrasonic sensors (HC-SR04) and a buzzer.
I intend let the circuit run for at least a week.
Is there a solution to reduce power consumption / increase battery life?
I am open to hardware and software solutions.
Thanks!
You could do a checking routine. For example, if you are detecting motion you can connect the vcc pin of the HC-04 to a digital pin and turn it on and check for changes once every 10 seconds.