When the time is completed load is switched off automatically.Now click on start button to switch the load.Set the time by pressing these buttons.When the button is pressed, time is incremented every time. Now using the two buttons set the timer.Button connected to 8th pin is used to set the timer in minutes and button connected to 10th pin is used to set the timer in hours.Initially when the circuit is switched LCD will display ” adjustable timer”.Here a relay is used to switch the load for certain amount of time. Here arduino plays a key role in setting this time period. This is used to switch on the loads for the certain time period and then they are automatically switched off. Adjustable Timer(Using Arduino)Īrduino adjustable timer is simple circuit to generate timer for required time. Here is timer using arduino which is user friendly. If very long time delays are required it is not advisable to use 555 timer.Instead one can use a microcontroller. This circuit is used in such applications where cyclic operation is required.This can be achieved by adding a level sensor such that this sensor input drives the reset and inhibit pins towards the ground potential.Suppose if there is adequate water in the tank, the pump must be turned off automatically.It can be ON until cooler mats are wet and then it can switched off.Again when they are dry it should pump the water.For example in air coolers,there is a pump that pumps water to the mat.This need not be switched on continuously. Let us understand the application of this circuit.It is also possible to add a sensor or switch at reset input of decade counter for automatic turning off the load in emergency or needy (for an automatic operation) situations.Therefore, ON and OFF can be varied for desired duty cycles by appropriately connecting the pins of decade counter.Suppose in this circuit 3 outputs of CD4017 are used.So,On time of load is 3 times of T (high) and off time is 9 times of T(high).Here the length of ON-time of the load is a multiple of 555 timer period output and number of outputs used in CD4017.(Instead of 6v relay one can use 12v relay also but relay should be applied with 12v instead of 6v.)
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