Microcontroller sensor interfacing exercises
SS49E magnetic field sensor
- sensitivity: 1.4 mV/Gauss; offset: 2.5 V at 0 Gauss
- output voltage range: 1 V to 4 V
ADC
- Voltage reference: 1.1 V
- Number of bits: 10
- Jusfitication: right
Signal conditioning
- voltage divider
- R1 = 43 k, R2 = 16 k
To do:
- Write a function that calculates the sensed value as a function of the ADC code!
| sensor input | sensor output | ADC input | ADC output | calculated sensor input |
|---|---|---|---|---|
| -559 Gauss | 1.7174 V | 0.465736 V | 434 | -557.748 Gauss |
| 44 Gauss | 2.5616 V | 0.694671 V | 647 | 44.9175 Gauss |
| -110 Gauss | 2.346 V | 0.636203 V | 592 | -110.7 Gauss |