I am trying to do a demonstration in which energy from ambient radio waves (it doesn't matter which frequency) is used to charge up capacitors and blink a red 3 volt 1 mA led every 10 seconds or so. Is this feasible? If so how can I go about building it.
Do you know an energy harvesting ic that collects energy from radio waves ?I can only find ics that use motion, or peltier, or solar, or nearby inductance, and so on.
RFID works on this principle.The "tag" is bombarded with a low freq / low level energy long enough to transmit its data a few inches to a nearby receiver.Not something that can power any microcontroller.
If you strip an RFID tag down and connect an LED across the coil it will light up when presented to the reader. We used to have an RFID tag in a transparent case that our CEO used to have to impress his clients, I have made several.