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Circuit Snippets


TIP 120 driving a motor:


Pull down resistor configuration:

Read multiple switches using the ADC at a single analog port instead.


Vout = Vcc (R2/(R1 + R2))

Va = 5 (Rz/(Rz + Ra)) = 4.5
Va = 5 (Rz/(Rz + Ra + Rb)) = 3.6
Va = 5 (Rz/(Rz + Ra + Rb + Rc)) = 2.7
Va = 5 (Rz/(Rz + Ra + Rb + Rc + Rd)) = 1.9