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README.md

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 # picoAM
 A simple but capable AM transmitter for the Raspbery Pi pico!
+
+![Image of assembled circuit](https://media.discordapp.net/attachments/1077080199847489626/1102196399577247774/20230430_133433.jpg)
+
+## Disclaimer!!
+
+The Pi is not able to output enough power to disrupt anything significantly, but with a long enough antenna, will get you in 
+trouble and annoy othere. Please use this only for experimental purposes and do NOT use this in a way which might cause any disruption!
+
+My antenna for this is barely large enough for half of my room to have reception. Please don't go much further than that!
+
+## How it works
+
+The Pi generates a 1557kHz PWM signal, which will be the carrier wave. The frequency is not changed, only the pulse width.
+(Sadly, I was not able to make an FM version because FM would require more precise frequency shifts, which the pico just can't do.)
+Then, an audio input is taken in on the right side of the breadboard (blue and green wire), which is clamped and slightly loaded 
+so that we don't get nasty interference.
+Then, this clean signal is given to the pico on pin 26. The pico does pulse width changes according to the signal, and outputs the 
+AM signal on pin 15.
+
+## Circuit Diagram and explanation
+
+![Image of circuit diagram](https://media.discordapp.net/attachments/1077080199847489626/1102203487363792956/SmartSelect_20230430_140248_Flexcil.jpg)
+
+The part which prepares the audio for the pico is not strictly needed, but if you use line inputs, you reeeally should have it.
+It has the following jobs:
+- R2 and R3 try to pull AI- a between the two voltages to be able to record the whole signal in case it is not a grounded one (not needed,
+  it can also just be connected to ground. this is basically just extra fanciness with nonzero but very small benefit.)
+- R1 makes sure there isn't too much strain put on the input
+- D1 and D2 clamp the signal to acceptable voltages
+- **An extra resistor of about 50-100 ohms may be added from the AI+ point to the AI- point to load the signal.** This is optional, but
+  *can* clean up a little bit of noise if you have long cables.
+
+## How to use it
+
+- Flash the ino file using the Arduino IDE
+- Cut open an audio cable and take one of the channels and the ground out of the cable's mantle
+- Connect those to jumper wires
+- Take a breadboard and put the pico on there, wire the circuit
+- Add the audio inputs
+- Add a **sufficiently long but not too long** antenna. Mine is about 2m-ish long.
+- Connect the Pi to your PC using the USB port for power
+- Connect the audio input to your PC
+- Tune in to 1557kHz AM