modul pwm dengan arduino pro mini dilengkapi dengan batrai level meter 5 led

 

🔋 Contoh Indikator Level Baterai dengan LED (4 Tingkat)

🔧 Tujuan:

• LED1 menyala jika tegangan ≥ 12.6V (full)

• LED2 menyala jika tegangan ≥ 12.4V

• LED3 menyala jika tegangan ≥ 12.2V

• LED4 menyala jika tegangan ≥ 12.0V

• Jika tegangan < 11.8V → semua LED mati + LED merah LOW BATT nyala

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📐 Perhitungan Tegangan & ADC pada Arduino 3.3V

Dengan voltage divider 10k:3.3k:

ini:

V_ADC = V_bat × 0.248
ADC = V_ADC / 3.3 × 1023

Berikut ADC untuk tiap tegangan:

Tegangan	V_ADC	ADC
12.6V	3.12V	~968
12.4V	3.07V	~951
12.2V	3.02V	~935
12.0V	2.98V	~923
11.8V	2.93V	~907

🧠 Gunakan 4 LED (bar indikator) + 1 LED Low Battery

LED	Pin Arduino
LED Full	D3
LED High	D4
LED Mid	D5
LED Low	D6
LED LowBat	D7

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✅ Kode Lengkap:

const int battPin = A1;
const int hallPin = A0;
const int pwmPin  = 9;

// LED indikator level baterai
const int ledFull   = 3;
const int ledHigh   = 4;
const int ledMid    = 5;
const int ledLow    = 6;
const int ledLowBat = 7;  // LED merah

// Batas ADC untuk tiap level (Vref = 3.3V, divider 10k:3.3k)
const int adcFull   = 968; // 12.6V
const int adcHigh   = 951; // 12.4V
const int adcMid    = 935; // 12.2V
const int adcLow    = 923; // 12.0V
const int adcCutoff = 907; // 11.8V

void setup() {
  pinMode(pwmPin, OUTPUT);
  pinMode(ledFull, OUTPUT);
  pinMode(ledHigh, OUTPUT);
  pinMode(ledMid, OUTPUT);
  pinMode(ledLow, OUTPUT);
  pinMode(ledLowBat, OUTPUT);
}

void loop() {
  int battADC = analogRead(battPin);

  // Reset semua LED
  digitalWrite(ledFull, LOW);
  digitalWrite(ledHigh, LOW);
  digitalWrite(ledMid, LOW);
  digitalWrite(ledLow, LOW);
  digitalWrite(ledLowBat, LOW);

  if (battADC >= adcFull) {
    digitalWrite(ledFull, HIGH);
    digitalWrite(ledHigh, HIGH);
    digitalWrite(ledMid, HIGH);
    digitalWrite(ledLow, HIGH);
  } else if (battADC >= adcHigh) {
    digitalWrite(ledHigh, HIGH);
    digitalWrite(ledMid, HIGH);
    digitalWrite(ledLow, HIGH);
  } else if (battADC >= adcMid) {
    digitalWrite(ledMid, HIGH);
    digitalWrite(ledLow, HIGH);
  } else if (battADC >= adcLow) {
    digitalWrite(ledLow, HIGH);
  } else {
    // Baterai < 11.8V → LOW BATT
    digitalWrite(ledLowBat, HIGH);
    analogWrite(pwmPin, 0); // PWM dimatikan
    delay(100);
    return;
  }

  // Jika tegangan cukup, lanjutkan kontrol PWM
  int hallADC = analogRead(hallPin);
  int pwmValue = map(hallADC, 0, 1023, 0, 255);
  analogWrite(pwmPin, pwmValue);

  delay(100);
}

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💡 Saran Fisik:

• Gunakan LED warna hijau untuk full, high, mid, low

• Gunakan LED merah untuk low battery

• Tambahkan resistor 330–470Ω di seri tiap LED