Diego Contreras Ocampo
Published © CC BY-NC

Latch or Self-power-off Arduino

A latch circuit allowing the Arduino to power-on by pushing a momentary button and then decide when to power-off by code.

IntermediateFull instructions provided1 hour5,898
Latch or Self-power-off Arduino

Things used in this project

Hardware components

Arduino UNO
Arduino UNO
×1
Breadboard (generic)
Breadboard (generic)
×1
Pushbutton switch 12mm
SparkFun Pushbutton switch 12mm
×1
Darlington High Power Transistor
Darlington High Power Transistor
NPN
×1
General Purpose Transistor PNP
General Purpose Transistor PNP
used tip 127 in my example
×1
LED (generic)
LED (generic)
×1
Jumper wires (generic)
Jumper wires (generic)
×1
SparkFun Breadboard Power Supply Stick 5V/3.3V
SparkFun Breadboard Power Supply Stick 5V/3.3V
×1
Resistor 330 ohm
Resistor 330 ohm
×1
Resistor 1k ohm
Resistor 1k ohm
×2

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Schematics

Circuit

Circuit Diagram

Credits

Diego Contreras Ocampo

Diego Contreras Ocampo

1 project • 4 followers
First time exploring Arduino. Rookie!

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