backup 14041130

14041130/mq/ppm/ppm.ino

@@ -0,0 +1,57 @@
+#include <Arduino.h>
+
+// ========== پارامترهای مدار ==========
+#define VREF_ADC        3.3f
+#define ADC_RESOLUTION  4095.0f
+#define R1              1448.0f
+#define R2              1566.0f
+#define VCC_SENSOR      4.67f
+#define RL_SENSOR       10000.0f
+#define R0              139160.0f    // ← مقدار R0 بدست‌آمده از کالیبراسیون (بر حسب اهم)
+#define CO_A            1.9f        // ضریب A در فرمول ppm = A * (Rs/R0)^B
+#define CO_B            -0.6f       // ضریب B (معمولاً منفی)
+#define ADC_PIN         A2
+#define NUM_SAMPLES     10
+
+// =====================================
+
+float readSensorVoltage() {
+  uint32_t sum = 0;
+  for (int i = 0; i < NUM_SAMPLES; i++) {
+    sum += analogRead(ADC_PIN);
+    delay(10);
+  }
+  float adcValue = sum / (float)NUM_SAMPLES;
+  float vAdc = (adcValue / ADC_RESOLUTION) * VREF_ADC;
+  return vAdc * (R1 + R2) / R2;
+}
+
+float calculateRs(float vOut) {
+  if (vOut <= 0.0f) return 0.0f;
+  return RL_SENSOR * (VCC_SENSOR / vOut - 1.0f);
+}
+
+float calculatePPM(float rs) {
+  float ratio = rs / R0;
+  if (ratio <= 0.0f) return 0.0f;
+  return CO_A * pow(ratio, CO_B);
+}
+
+void setup() {
+  Serial1.begin(115200);
+  analogReadResolution(12);
+  pinMode(ADC_PIN, INPUT);
+
+  Serial1.println("MQ7 CO Measurement");
+  Serial1.print("R0 = "); Serial1.print(R0); Serial1.println(" ohms");
+  Serial1.println("Starting...\n");
+  delay(3000);
+}
+
+void loop() {
+  float vOut = readSensorVoltage();
+  float rs = calculateRs(vOut);
+  float ppm = calculatePPM(rs);
+  Serial1.print("CO = "); Serial1.print(ppm, 1); Serial1.println(" ppm");
+  delay(2000);
+}