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
» ExpressLRS - 868/915 Mhz equipment
» Flight controllers as sub levelers
» Bournville 2023
» Raspberry Pi Pico + ePaper display hat
» Help with 1:48 scale WW2 German U boat
» Problem with Futaba FX-30 and 40 MHz module
» Resurgam, Nordenfelts II & IV - George Garrett's works.
» Letter to BMFA to request the sharing of the 35MHz frequency for model subs in the UK.