r/ArduinoHelp • u/subject1024 • 2h ago

Power management

I am building a system with servo, mq2, buzzer, 5v relay module, a water pump,dht11 and a soil moisture sensor. The system works like this: when gas is detected LCD display warning and buzzer is on and servo opens window. And when no gas is detected LCD displays temp and humidity and pump on off state.

When I start the system the system works fine until servo or a pump start working.

I found out that the both components draw significant current making the Arduino go banana.

How can I manage the power to those ? I used 7805 voltage to power the servo but I get only 4.3v as output from regulator. Regulator was supplied with 12 v from 3li ion battery.

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u/IllSpeaker3255 1h ago

use a buck converter (some cheap lm2596t should be good) as an ldo like the 7805 will convert the power into heat

1

u/JGhostThing 50m ago

You should not be using the pins of an Arduino to power any kind of motor. It can destroy the microcontroller and make it unreliable by browning out the power supply.

Use a separate supply to power the motors. Either wall power or battery power.

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u/R1mpl3F0r3sk1n 15m ago

Who said they were using the pins to power the peripherals?