So, if you want more control over the relay then you should read my above articles. If at any time you need to change the minutes and seconds, you can simply press the Hash “#” key on the keypad which will take you back to the main screen, and you can start again by entering the minutes and seconds. This load will remain ON until the total seconds decrements to 0. The load which is connected with the relay is turned ON. The timer is started which is based on the millis function. The user simply enters the time in minutes and seconds and press the Asterisks “*” key on the Keypad. Using this Arduino based countdown timer is very simple the instructions are displayed on the 16×2 LCD. This countdown timer is ideal for AC and DC loads. in fact, this countdown timer can be used anywhere where you need to control anything on the time basis. With the help of this Countdown timer, you can control different types of electrical loads like for example Light Bulbs, Heaters, Water Pumps, Washing Machines, Fans, etc. This countdown timer can be used as the end product. Later, I designed an advanced version of the same project “Advanced Countdown Timer”. With the help of this project, you can turn ON anything, for more details read my article on “Control Anything on Time basis”. In my previous tutorial I designed a project “Control anything on Time Basis”, this project was based on the Atmega328 microcontroller, this is the same microcontroller which is used in Arduino Uno Board. This is the cheapest and simplest automatic relay controller circuit.Īdvanced Time Delay Relays can be designed using programmable controllers. This is a low cost and purely electronics-based project. A variable resistor or Potentiometer is used to adjust the time. In this project, I have used a Pushbutton which is used to turn ON the relay for the specified time.

The Time Delay Relays can be used in hundreds of different types of electronic and controller based projects. Time Delay Relay using 555 Timer– In this tutorial, you will learn how to turn ON a relay for a specific time using 555 Timer and a few electronic components like resistors, capacitors, and diodes. 555 Timer based Time Delay Relay Circuit Diagram:.IC 555 Pin Diagram / Description / configuration / Pinout:.

Download free 555 timer pinout