what kind of information can be read or written to a digital pin
binary information
is an arduino a binary device
yes, it can only read a high voltage or a low voltage. So, we need a voltage divider circuit
what is arduino's ADC?
analog-to-digital converter. it measures a range of voltages and converts the value of the voltage at any given moment to a digital value
which pins support analogWrite()
9,10,11. Newer boards also support 3,5,6
since the arduino is a binary device, how does the analogWrite() method work?
the method takes 0 to 255 as input. 255 generates a constant 5V at the specified pin. For values between 0 and 255, the pin rapidly alternates between 0 and 255 volts - the higher the value, the more often the pin is at HIGH
