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Infrared remote controllers are everywhere around us. The majority of home appliances are controlled using infrared remote controls. In this article/video, we learn to build a device that can decode (almost) any IR remote control and use the instructions to switch the relays (loads). So we can use this feature in a variety of applications without buying a new IR remote control and expensive hardware, such as turning ON/OFF the lights, opening/closing the curtains, ... etc. I have used an ATTiny85 microcontroller as the heart of the circuit. The device can record up to three IR codes in the EEPROM memory and switch 3 separate devices. Each relay can handle the currents up to 10A. The load switching mechanism (momentary ON/OFF, toggling, .. etc) can be programmed by the user. I used Altium Designer 21.4.1 and the SamacSys component libraries (SamacSys Altium Plugin) to design the Schematic and PCB. I also used the Siglent SDS2102X Plus/SDS1104X-E to analyze the IR signals. The device works stable and reacts well to the transmitted IR signals. So let’s get started and build this puppy! References Article: https://www.pcbway.com/blog/technology/Infrared_Remote_Control_Decoder___Switcher_Board.html : L7805 datasheet: https://www.st.com/resource/en/datasheet/l78.pdf : TS2937CW-5.0 datasheet: http://www.taiwansemi.com/products/datasheet/TS2937_E15.pdf : VS1838 infrared receiver module datasheet: https://www.elecrow.com/download/Infrared%20receiver%20vs1838b.pdf : FDN360P datasheet: https://www.onsemi.com/pdf/datasheet/fdn360p-d.pdf : ATTiny85-20SUR datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2586-AVR-8-bit-Microcontroller-ATtiny25-ATtiny45-ATtiny85_Datasheet.pdf : Si2302 datasheet: https://www.vishay.com/docs/63653/si2302dds.pdf : Altium Designer electronic design CAD software: https://www.altium.com/altium-designer : SamacSys Altium plugin: https://www.samacsys.com/altium-designer-library-instructions : ATTiny85 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/ATTINY85-20SUR/Microchip : TS2937-5.0 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/TS2937CW-5.0%20RP/Taiwan%20Semiconductor : L7805 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/L7805CV/STMicroelectronics : SI2302 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/SI2302DDS-T1-GE3/Vishay : FDN360P schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/FDN360P/ON%20Semiconductor : ATTinyCore: https://github.com/SpenceKonde/ATTinyCore : IRRemote library: https://github.com/Arduino-IRremote/Arduino-IRremote : Siglent SDS2102X Plus oscilloscope: https://siglentna.com/products/digital-oscilloscope/sds2000xp-series-digital-phosphor-oscilloscope : Siglent SDS1104X-E oscilloscope: https://siglentna.com/digital-oscilloscopes/sds1000x-e-series-super-phosphor-oscilloscopes