Gikfun Gikfun 5mm 940nm LEDs Infrared Emitter and IR Receiver Diode for Arduino (Pack of 20pcs) EK8443

minimal parts count are needed on your board to use these

Beware! The IR photodiodes respond to visible light. A complete waste of time as an IR detector, which is what they were bought for.And data on these parts is not provided and nor I could not find any. I bought 20 pcs, but only received 17 in the bag.

For small distances, this product worked perfectly. I'm adding electronics to my cornhole board so that I can illuminate it at night. By making a circuit with these LEDs, a few 555 timers, and some 12 volt LED strip lights, I could monitor whether or not a player scored, and then flash my lights accordingly.For the emitter, I'm using 5V with 220 ohms resistance. The receiver also has a 5V power supply and a 5K pulldown resistor. This gives me a range of around 7.5-8 inches, perfect for a 6 inch diameter hole. Note that the voltage given by the receiver is under 2V when the emitter is too far away. For projects needing longer distance, a 5mW laser and 100K LDR would probably work better, but for a little more cost.Also, the long leg on the emitter is the anode, while the long leg on the receiver is the cathode. A little strange, but the products work, so I'm not too judgmental. Highly recommended for small projects like my own.

Very quick service and a top product.

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