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Oleg Kalachev
a5991930d1
Filtering does more harm than good in voltage monitoring. (alpha = 1 efficiently disables the filter.)
30 lines
725 B
Arduino
30 lines
725 B
Arduino
// Copyright (c) 2026 Oleg Kalachev <okalachev@gmail.com>
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// Repository: https://github.com/okalachev/flix
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// Power management
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#include <soc/soc.h>
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#include <soc/rtc_cntl_reg.h>
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#include "lpf.h"
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#include "util.h"
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float voltage = NAN;
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LowPassFilter<float> voltageFilter(1);
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int voltagePin = -1;
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float voltageScale = 2;
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void setupPower() {
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REG_CLR_BIT(RTC_CNTL_BROWN_OUT_REG, RTC_CNTL_BROWN_OUT_ENA); // disable reset on low voltage
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if (digitalPinToAnalogChannel(voltagePin) == -1) voltagePin = -1; // test ADC pin
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}
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void readVoltage() {
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if (voltagePin < 0) return;
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static Rate rate(10);
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if (!rate) return;
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float v = analogReadMilliVolts(voltagePin) * voltageScale / 1000.0f;
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voltage = voltageFilter.update(v);
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}
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