Introduction: Tuchless Switch for Home Appliances || Control Your Home Appliances Without Tuch Any Switch

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This Is A Tuchless Switch For Home Appliances. You Can Use This To Any Public Place So That Help To Fight Any Virus. The Circuit Based On Dark Sensor Circuit Made By Op-Amp And LDR. Second Important Part Of This Circuit SR Flip-Flop With Sequencelly Switching Circuit. Control Any AC Appliances So That Need One Relay. If You Do Not Use Relay So Purchase Relay Module. You Can Put Your Hand First Time On LDR Then Light Bulb💡 ON And Remaining Continue ON. if You Put Your Hand Second Time On LDR Then Light Bulb💡Off.

Components:-

LM358 IC

LDR

1K And 10K Resistors

BC547 Transistor

IN4007 Diodes

12v Relay

5V Relay

Step 1: Make a Dark Sensor Circuit

Let Take LDR And 1K Resistors Create A Voltage Divider. Connect This Voltage Divider With Inverting Terminal OF OP-AMP IC. Take 1k Resistor And 10K Potentiometer Create A Variable Voltage Divider. Connect This Voltage Divider With Non-Inverting Terminal OF OP-AMP.

Step 2: SR Flip-Flop With Sequencelly Switching Circuit

This Circuit Work As A 1 Bit Storage Device. You Can Apply First Time Positive Signal Pulse Then The Circuit Output Logic Level 1 And Continue Remaining Output Logic Lavel 1. If You Can Apply Second Time Positive Pulse Then The Circuit Output Logic Lavel 0 And Continue Remaining Logic Level 0.

Step 3: DIY Relay Module for Control AC Appliances

Let's Take 1k Or 10k any One Resistor Connect base Terminal Of BC547 Transistor. Second Take 5-12v Relay And Connect Any One Coil Terminal With BC547 Transistor Collector Terminal. Relay Coil Generate A Spike So Reduce This Spike Connect A PN Junction Diode In Reverse Bias Of Relay Coil Terminals. You Can Use IN4007 Diode. Connect Your Home Appliances In Series With Com And N/O Terminal Of Relay. Connect +12V Power With Coil And Diode Negative Terminal. Connect Power Source Ground With Transistor Emitter. Apply Any 5V Signal On 10K Resistor.

Step 4: Let's Make Final Circuit

Let's First Connect OP-Amp Output With Input Of SR Flip-Flop Sequencelly Switching Circuit Input. Second Connect Any One SR Flip-Flop Sequencelly Switching Circuit Output With Input Of Relay Module. Connect Your Home Appliances In Series With Relay Com And N/O Terminal.