Adam Wonak
65dde4d62e
Note, this will also require to you "uninstall and reinstall" the Arduino library due to the library file location changes. Reviewed-on: https://git.pinkduck.xyz/awonak/libGravity/pulls/20
89 lines
2.1 KiB
C++
89 lines
2.1 KiB
C++
/**
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* @file analog_input.h
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* @author Adam Wonak (https://github.com/awonak)
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* @brief Class for interacting with analog inputs.
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* @version 0.1
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* @date 2025-05-23
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*
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* @copyright MIT - (c) 2025 - Adam Wonak - adam.wonak@gmail.com
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*
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*/
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#ifndef ANALOG_INPUT_H
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#define ANALOG_INPUT_H
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const int MAX_INPUT = (1 << 10) - 1; // Max 10 bit analog read resolution.
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// estimated default calibration value
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const int CALIBRATED_LOW = -566;
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const int CALIBRATED_HIGH = 512;
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class AnalogInput {
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public:
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AnalogInput() {}
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~AnalogInput() {}
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/**
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* Initializes a analog input object.
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*
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* @param pin gpio pin for the analog input.
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*/
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void Init(uint8_t pin) {
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pinMode(pin, INPUT);
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pin_ = pin;
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}
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/**
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* Read the value of the analog input and set instance state.
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*
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*/
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void Process() {
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old_read_ = read_;
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int raw = analogRead(pin_);
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read_ = map(raw, 0, MAX_INPUT, low_, high_);
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read_ = constrain(read_ - offset_, -512, 512);
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if (inverted_) read_ = -read_;
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}
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// Set calibration values.
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void AdjustCalibrationLow(int amount) { low_ += amount; }
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void AdjustCalibrationHigh(int amount) { high_ += amount; }
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void SetOffset(float percent) { offset_ = -(percent)*512; }
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void SetAttenuation(float percent) {
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low_ = abs(percent) * CALIBRATED_LOW;
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high_ = abs(percent) * CALIBRATED_HIGH;
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inverted_ = percent < 0;
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}
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/**
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* Get the current value of the analog input within a range of +/-512.
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*
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* @return read value within a range of +/-512.
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*
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*/
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inline int16_t Read() { return read_; }
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/**
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* Return the analog read value as voltage.
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*
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* @return A float representing the voltage (-5.0 to +5.0).
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*
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*/
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inline float Voltage() { return ((read_ / 512.0) * 5.0); }
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private:
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uint8_t pin_;
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int16_t read_;
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uint16_t old_read_;
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// calibration values.
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int offset_ = 0;
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int low_ = CALIBRATED_LOW;
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int high_ = CALIBRATED_HIGH;
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bool inverted_ = false;
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};
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#endif
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