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I am just putting the components away for something I was trying with the original Darnell XXI. I originally needed to send a servo signal through a clear, flat plastic hatch. I dropped the idea later as you will see in the Darnell XXI thread.
But the method I tried worked well and was very simple.
The sender unit (connected to the receiver) was just an Infrared LED with a 30 ohm resistor in series (just to limit the current. The receiver unit (connected to the servo) was a photodiode with a 1 megohm resistor in series. (The LED and photodiode were a matched pair but I can't remember where I bought them from. Ebay probably.)
The early trials were surprisingly successful with the signal being happily beamed through several mm of plastic or even water.
If you used a separate 5v supply at the receiver end then that is just one wire to transmit a servo signal.
David
But the method I tried worked well and was very simple.
The sender unit (connected to the receiver) was just an Infrared LED with a 30 ohm resistor in series (just to limit the current. The receiver unit (connected to the servo) was a photodiode with a 1 megohm resistor in series. (The LED and photodiode were a matched pair but I can't remember where I bought them from. Ebay probably.)
The early trials were surprisingly successful with the signal being happily beamed through several mm of plastic or even water.
If you used a separate 5v supply at the receiver end then that is just one wire to transmit a servo signal.
David
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