A specific voltage can be sent to the AIN1 channel using a potentiometer. Please keep in mind that each one of the ADC pins can only handle 1.8V maximum.
- Hook up a BeagleBone or BeagleBone Black to the breadboard as shown in the diagram.
| Potentiometer | Pin | Bone | |
|---|---|---|---|
| outer terminal | 1.8V | P9_32 | P1_18 |
| outer terminal | GND | P9_34 | P1_17 |
| wiper (middle) | A1 | P9_40 | P1_21 |
- After clicking ‘run’, the ADC1 channel will output a reading between 0-1, where 0 is 0V and 1 is the maximum input voltage (1.8V).
- Adjust your potentiometer's knob and click run again. The lower the resistance, the higher voltage you will see.
- Alter the code to look at inputs on other analog input pins. A schematic showing all available ADC channels are listed here.
Analog pin mapping on AI
| Bone P9 | AIN | /sys/bus/iio/devices/iio:device0/in_voltage*_raw |
|---|---|---|
| 39 | 0 | 0 |
| 40 | 1 | 1 |
| 37 | 2 | 3 |
| 38 | 3 | 2 |
| 33 | 4 | 7 |
| 36 | 5 | 6 |
| 35 | 6 | 4 |
Analog pin mapping on Black/Pocket
| Black | AIN | /sys/bus/iio/devices/iio:device0/in_voltage*_raw | |
|---|---|---|---|
| P9_39 | P1_19 | 0 | 0 |
| P9_40 | P1_21 | 1 | 1 |
| P9_37 | P1_23 | 2 | 2 |
| P9_38 | P1_25 | 3 | 3 |
| P9_33 | P1_27 | 4 | 4 |
| P9_36 | P2_35 | 5 | 5 |
| P9_35 | P1_02 | 6 | 6 |