Development, Implementation, And Performance Analysis of a One-Channel Infrared Solid-State Remote Switching System

This project presents the design and development of a single channel infra-red remote-controlled electrical switching system using a CD4017 Decade Counter Integrated Circuit (IC). The main objective is to remotely control a 220V AC appliance(s) such as TV, FANS, and Lighting systems etc. through an Infra-Red (IR) remote system, ensuring safety, simplicity and low cost. The system consists of three main sections: IR signal reception, signal processing and load switching. The IR receiver module (TSOP1738) detects incoming infra-red signals, typically from TV remote or a custom remove controller. This signal is then amplified by a PNP transistor (9015) and shaped into a clean digital pulse using a Resistor-Capacitor (RC) circuit. The clean pulse is fed into the CD4017IC, a decade counter that advances its output on every received pulse, when activated, the output pin triggers an NPN transistor (9014) which in turn energizes a relay (HK4100F). The relay acts as a switch to control high-voltage AC loads. Additional components, such as a fly back diode (1N4007) and a status LED, protect the circuit and provide visual feedback respectively. The system operates from a regulated +5V DC power supply, isolated from the AC load, ensuring user safety.