42 lines
1.1 KiB
Arduino
42 lines
1.1 KiB
Arduino
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// Vehicle Voltage Monitor
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// Reads 12V-14.4V battery via voltage divider on A0
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// Outputs to Serial for PC monitoring
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// Pin definitions
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const int PIN_VBAT = A0; // Vehicle voltage input (via divider)
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// Voltage divider constants
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// Divider: 100k upper (to Vin), 47k lower (to GND)
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// Vout = Vin * (47k / (100k + 47k)) = Vin * 0.3197
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// So Vin = Vout / 0.3197
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// At 12V: ADC sees 3.84V | At 14.4V: ADC sees 4.60V
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const float DIVIDER_RATIO = 47.0 / (100.0 + 47.0); // ~0.3197
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const float ADC_REF = 5.0;
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const int ADC_MAX = 1023;
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void setup() {
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Serial.begin(9600);
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pinMode(LED_BUILTIN, OUTPUT);
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}
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void loop() {
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// Read and calculate voltage
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int rawAdc = analogRead(PIN_VBAT);
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float vDivider = (rawAdc / (float)ADC_MAX) * ADC_REF;
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float vBattery = vDivider / DIVIDER_RATIO;
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// Output to serial
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Serial.print("ADC: ");
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Serial.print(rawAdc);
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Serial.print(" | V_bat: ");
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Serial.print(vBattery, 2);
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Serial.println("V");
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// Heartbeat blink
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digitalWrite(LED_BUILTIN, HIGH);
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delay(50);
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digitalWrite(LED_BUILTIN, LOW);
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delay(1000); // 1Hz update rate
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}
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