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1 | /** | |||
2 | * @author Matthew Kennedy, (c) 2019 | |||
3 | */ | |||
4 | ||||
5 | #include "resistance_func.h" | |||
6 | ||||
7 | 7 | void ResistanceFunc::configure(float supplyVoltage, float pullupResistor, bool isPulldown) { | ||
8 | 7 | m_pullupResistor = pullupResistor; | ||
9 | 7 | m_supplyVoltage = supplyVoltage; | ||
10 | 7 | m_isPulldown = isPulldown; | ||
11 | 7 | } | ||
12 | ||||
13 | 18 | SensorResult ResistanceFunc::convert(float raw) const { | ||
14 | // If the voltage is very low, the sensor is a dead short. | |||
15 |
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18 | if (raw < 0.05f) { |
16 | 2 | return UnexpectedCode::Low; | ||
17 | } | |||
18 | ||||
19 | // If the voltage is very high (98% VCC), the sensor is open circuit. | |||
20 |
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16 | if (raw > (m_supplyVoltage * 0.98f)) { |
21 | 2 | return UnexpectedCode::High; | ||
22 | } | |||
23 | ||||
24 |
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14 | if (m_isPulldown) { |
25 | // If the sensor is on the high side (fixed resistor is pulldown), | |||
26 | // invert the voltage so the math comes out correctly | |||
27 | 4 | raw = m_supplyVoltage - raw; | ||
28 | } | |||
29 | ||||
30 | // Voltage is in a sensible range - convert | |||
31 | 14 | float resistance = m_pullupResistor / (m_supplyVoltage / raw - 1); | ||
32 | ||||
33 | 14 | return resistance; | ||
34 | } | |||
35 |