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An LED is a type of light source which is typically fairly small and has low power requirements.

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I've been trying to use a KY-022 to read IR signals. However no output is being produced and the LED on the board is constantly on. Board: Arduino Uno R3 I followed the procedure found here. The … )) { Serial.println(results.value, HEX); irrecv.resume(); // Receive the next value } delay(100); } The output: Enabling IRin Enabled IRin The LED is constantly on, it should come on when …
asked Mar 7 '18 by Max