Monday, August 14, 2017

Circuit Schematic Touch ON and OFF Switch using 555 IC

Eltronicschool. - This is one of 555 IC application to build touch on and off switch in this time. So, in here you will show the circuit schematic of Touch ON and OFF Switch using 555 IC as the main component.

Beside we will give you the circuit schematic and component part of this Touch ON and OFF Switch using 555 IC, we also will give you the description of this circuit and the last we will give you the link to read more the circuit.

Circuit Schematic

Component Part
  1. 1 x 555 Timer IC
  2. 1 x 3.3 MΩ Resistor (1/4 Watt)
  3. 1 x 1 MΩ Resistor (1/4 Watt)
  4. 1 x Bulb with holder (regular or CFL)
  5. 1 x 5V Relay Module (if relay module is not available, then you need the following components)
  6. 1 x 5V Relay
  7. 1 x 2N2222 NPN Transistor
  8. 1 x 1N4007 PN Junction Diode
  9. 1 x 1 KΩ Resistor (1/4 Watt)
Description

Circuit schematic like in Figure 1 above is Touch ON and OFF Switch using 555 IC. Accordingly Electronichub site describe that the design of the Touch ON and OFF Switch circuit is very simple. First, the GND, VCC and RST pins of the 555 i.e. pins 1, 8 and 4 are connected to GND and 5V respectively. Pin 2 is pulled HIGH using a 3.3 MΩ Resistor and Pin 6 is pulled LOW using a 1 MΩ Resistor.

Two touch plates are connected to pins 2 and 6 as shown in the circuit diagram. In case of the touch to ON plate, one end is connected to pin 2 and other end is connected to GND. Similarly, one end of the touch to OFF plate is connected to +5V and the other end is connected to Pin 6.

The main principle behind the project lies in the basic functionality of the pins of 555 Timer. We know that 555 Timer has 8 pins namely GND (1), Trigger (2), Output (3), Reset (4), Control Voltage (5), Threshold (6), Discharge (7) and VCC (8).

In this, Pins 2 and 6 are used in this project. Now, we see the basic working of these pins. When Pin 6 i.e. the Threshold pin is held LOW, and if Pin 2 i.e. the Trigger Pin is made LOW, the output of the 555 Timer IC will be HIGH and it stays there. This condition can be used to turn ON the appliance.


Now consider Pin 2 is pulled HIGH and if Pin 6 is made HIGH, the output of the 555 Timer IC will be LOW and it stays there. This condition can be used in our project to turn OFF the load or device. And read more HERE.


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