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A very simple example of two boards communicating. The board on the left is programmed to write to a digital output pin in response to a button input. The board on the right uses a digitalread() to read the voltage and responds by changing the state of an output device. This is an example of communicating with one bit (HIGH or LOW) at a time. The two boards just share ground. They must both be powered, and can share a power line.
[code](./receive_01.txt) for the receiving board.
[code](./transmit_01.txt) for the transmitting board.
###Schematic of this example.
[Tinkercad Model](https://www.tinkercad.com/things/hIUnMXcwy7T-amazing-lappi/editel?sharecode=vtwP3RghNCQO-daC03vf5SoBe5mglupaxAMkmaYjfr0)
###Video.
This is an example of two boards runnning this code. A microcontroller board on left, powered through computer USB; Another microcontroller board on right, powered by rechargeable battery. When the button is pushed, the left board sends a HIGH to the right board which moves its servo.
<video width="300" height="541" controls>
<source src="wired_01.mp4" type="video/mp4">
</video>
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