Here’s the front-end circuit of the IR sniffer. The hardware will capture an IR code and retransmit it on demand. The schematic isn’t particularly complex. The IR receiver module is represented here ...

Seeed_Arduino_IR forked from RLib2. It is a Library for Receiving, Decoding and Sending Infrared Signals Using Arduino. IRLib2 is copyright 2017 by Chris Young. It it is a major rewrite of the ...

As you might have noticed, the 38-KHz pulse generator is built around the evergreen timer chip NE555P (IC1). Here, the RC components (R5-C3-P1) set the astable frequency to drive the infrared light ...

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And that became the DCF77 decoder presented here. Like decoding IR remote controls, decoding the Frankfurt time signal takes only one GPIO input - to connect to a DCF receiver board (Conrad# 641138).