photocell

A traditional radio would be like an LED and a photocell; you can blink the LED and detect it with the photocell, but the maximum data rate is fairly small.

Each photocell is, in effect, wired in backwards, with its wire sticking out on the side nearest the light.

A good introduction, but a couple simplifiers: 1) You can read a photocell directly from a PC without an Arduino.

At the telescope's focus was a photocell and some sort of signal-generator, typically a spinning disk known as a chopper.

If they were already including a photocell, it might have been more or less free to use one that enabled this feature.

I'm sure a large enough mirror and photocell could get power out of the aurora borealis.

I have a couple LED night lights that are triggered by a photocell to only turn on in the dark.

I would also put a photocell on the device inside the internal shifter which would also set off the self-destruct mechanism.

The transistor never saturates in this circuit) The key to Adafruit's arduinos-but-for-cosplay, and my keychain photocell thingy is that neither demands two(!) 18650s worth of power.

The chopper causes the image of the star to repeatedly appear and disappear on the photocell, producing a signal that was then smoothed to produce an alternating current output.

I have no idea what the name was, but I'm pretty sure they used a photocell and nothing else, and communication was of course one way.

Adding a CdS photocell in series with a resistor to the base of your existing trigger transistor would make the circuit flash in response to external light pulses while maintaining its autonomous oscillation.

A photocell is I think the standard (or at least "the standard" in psychophysics applications I have also used).

A photocell and an oscilloscope will show the smoothed live-frequency wave (I wouldn't call it a "flicker").