17 lines
554 B
C
17 lines
554 B
C
#define ADC_PIN A0 // ESP8266 ADC pin
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const float ADC_MAX = 1023.0; // 10-bit ADC resolution
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const float V_REF = 3.3; // ESP8266 ADC reference voltage
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float readBatteryVoltage() {
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int rawADC = analogRead(ADC_PIN);
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float voltage = (rawADC / ADC_MAX) * V_REF;
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return voltage * (R1 + R2) / R2; // Scale to actual battery voltage
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}
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int batteryPercentage(float voltage) {
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if (voltage >= VOLTAGE_MAX) return 100;
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if (voltage <= VOLTAGE_MIN) return 0;
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return (voltage - VOLTAGE_MIN) * 100 / (VOLTAGE_MAX - VOLTAGE_MIN); // Linear mapping
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}
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