Project tutorial
Latch or Self-power-off Arduino

Latch or Self-power-off Arduino © CC BY-NC

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

  • 2,776 views
  • 1 comment
  • 1 respect

Components and supplies

Apps and online services

About this project

This is a project that is quite simple once you get how to use NPN and PNP transistors. It's useful as it adds the capability to completely power-off an Arduino through the use of code. Once turned off, the Arduino consumption is minimum and it waits for the push of a momentary button in order to power-up again.

Once the button was pushed, the circuit "latches" in its position, either until button number two is pressed or until the code lowers pin 5.

This is, for example, how an Amazon dash button is powered, as it keeps the microcontroller powered until the process is completed and the code turns off itself.

When power is off, power consumption is minimum and the Arduino itself would consume no power at all. It is quite useful for running one time codes, like on-click trigger something and then shutdown.

Schematics

Circuit
Circuit Diagram
Latch bb cbzqyu2otz

Comments

Similar projects you might like

Buzzer Alarm System With Help Of Arduino

by ONYX

  • 66,115 views
  • 10 comments
  • 38 respects

Morse Code Communication Using Arduino

Project tutorial by Jalal_Mansoori

  • 15,295 views
  • 18 comments
  • 31 respects

Arduino Piano

Project in progress by Teo Zhi Yi

  • 3,702 views
  • 0 comments
  • 7 respects

ESP8266 ESP-01 Webserver

by Robin Kanattu Thomas

  • 125,836 views
  • 22 comments
  • 163 respects

Magnet Levitation with Arduino

Project tutorial by jsirgado

  • 71,665 views
  • 117 comments
  • 222 respects

Android App-Based Home Automation System Using IOT

Project tutorial by Team Autoshack

  • 49,261 views
  • 22 comments
  • 141 respects
Add projectSign up / Login