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Figure 1 This four-channel AC DC12V 24V 433MHz remote relay module wireless RF switch, five transmitters, and one receiver were found on Amazon for about $34. It was the only unit I found that had five transmitters. If you already have a 433MHz receiver, a search for "Remote Control Key Fob" will find you four similar transmitters for about $16.

Build Quiz Game Based on Key Fob

Q&A Game Project with MEGA 2560 and Key Fobs A key fob is a common device we use in our daily life. This project is dedicated to building Quiz Game by utilizing Arduino MEGA 2560 and Key Fobs that can give you a great experience. Many of you have a key fob on your key […]
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