I'm trying to make my first Crystal radio for group project with my school friends.
Before starting this project, I thought if we could monitoring the frequency that caught by antenna with Arduino , It would help to design Crystal radio circuit diagram.
My radio circuit is very simple it consist of only one diode and cooper line.
Original circuit also include "the ground connection".
I'm going to connect it to analog inputs instead of ground.
Hi,
You will be receiving AM radio signals, right?? so 550000 to 1600000 Hz. You can not measure frequencies that high with Arduino. AND it's questionable wether you can retrieve the received signal even AFTER it is tuned in correctly.
Your crystal radio does not create any signal by itself that you can measure.
terryking228:
Hi,
You will be receiving AM radio signals, right?? so 550000 to 1600000 Hz. You can not measure frequencies that high with Arduino. AND it's questionable wether you can retrieve the received signal even AFTER it is tuned in correctly.
Your crystal radio does not create any signal by itself that you can measure.
Um I did not know how high its frequency.
And "Your crystal radio does not create any signal by itself that you can measure. "
it means that my radio could create some signal but i couldn't measuring it with arduino?
(Cause i'm non-English speaking student, is it correct that i understand?)
I'm trying to make my first Crystal radio for group project with my school friends.
Before starting this project, I thought if we could monitoring the frequency that caught by antenna with Arduino , It would help to design Crystal radio circuit diagram.
My radio circuit is very simple it consist of only one diode and cooper line.
Original circuit also include "the ground connection".
I'm going to connect it to analog inputs instead of ground.
Is it possible?
Is it powerful enough to damage my device?
(I hope your friendly answers thanks)
Radio signals can be very small, so you would normally amplify.
If a transmitter is nearby and you have a long antenna wire radio signals can over-voltage your
Arduino too (lightning would also do it).
But all this is irrelevant, radio frequencies are totally out of reach of the Arduino analog inputs.
While an Arduino could work with the lower audio frequencies output from the detector, there is no way it could read the actual carrier frequencies (as Terry observes in #1). Perhaps you are thinking of doing something like the cheap radios you buy that display the frequency they are tuned to - they are actually going at it from a different direction and showing the frequency of the local oscillator + offset) to show the frequency (look up superhetrodyne - they use a local oscillator of a known frequency mixed with the incoming signal to create a "difference" of a fixed frequency that is then processed for the information on the carrier and it is the local oscillator frequency + that difference they are displaying on the LCD on the front of the radio). What you are asking about is more of a "frequency counter" which requires input signal conditioning and some fast circuits (well beyond the Arduino) capable of counting cycles over some period of time to get the "frequency".