The blue circle has unit radius and therefore an area of π units. We can enclose it by a polygon with exactly 3.3 units of area, adding the parts marked red. Using precision resistors that meander through the blue and red areas respectively we can construct a voltage divider that subdivides the the 3.3 V power and ground rails to achieve a π V output.
Measure the voltage between the single analog output pin and ground. It should read approximately π volts.
Multimeter or other test equipment
# | Input | Output | Bidirectional |
---|---|---|---|
0 | |||
1 | |||
2 | |||
3 | |||
4 | |||
5 | |||
6 | |||
7 |
ua | analog | Description |
---|---|---|
0 | 6 | voltage output |