battery_monitor.h

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// ----------------------------------------------------------------------------
// INPUT VOLTAGE MONITOR
// 
// Code By: Michael Wrona
// Created: 4 Sept 2021
// ----------------------------------------------------------------------------
// Read the HFCU's voltage divider to read the input voltage on the Teensy 
// 4.1 Pin 22.
 
 
#pragma once
#include <Arduino.h>
#include <Wire.h>
#include "hummingbird_config.h"
#include "debugging.h"
#include "filters/median_filter.h"
 
 
// input_voltage = (SF * adc_output) + OFFSET
constexpr float BATTMONITOR_OFFSET  = 0.343256f; 
constexpr float BATTMONITOR_SF      = 0.016926f;  
 
 
 
 
class VoltageMonitor
{
public:
    VoltageMonitor();
    ~VoltageMonitor() {};
 
    // Do not allow copies (singleton)
    static VoltageMonitor &GetInstance();  // accessor
    VoltageMonitor(const VoltageMonitor &) = delete;
    VoltageMonitor &operator=(const VoltageMonitor & ) = delete;
 
    void Update();
    float GetVoltage();
 
    uint32_t prevMeasMillis;  
 
protected:
private:
    float v;  
    MedianFilter Filter;  
};
 
 
// Only one instance
extern VoltageMonitor &BattMonitor;