Différences

Ci-dessous, les différences entre deux révisions de la page.

--- start:esp32:pwm [2022/12/20 17:29] – [ESP32 PWM avec ADC] gerardadmin
+++ start:esp32:pwm [2023/01/27 16:08] (Version actuelle) – modification externe 127.0.0.1
@@ Ligne 149: / Ligne 149: @@
 L'image suivante montre les connexions pour régler le rapport cyclique des canaux PWM à l'aide de l'ADC (potentiomètres).
+{{ :start:esp32:esp32-pwm-adc-circuit.jpg?direct&600 |}}
+<code c pwmledPotentiometre.ino>
+const int redLEDPin = 16;  /* GPIO16 */
+const int greenLEDPin = 17;  /* GPIO17 */
+const int blueLEDPin = 4;  /* GPIO4 */
+uint16_t redDutyCycle;
+uint16_t greenDutyCycle;
+uint16_t blueDutyCycle;
+const int redPWMFreq = 5000; /* 5 KHz */
+const int redPWMChannel = 0;
+const int redPWMResolution = 12;
+const int RED_MAX_DUTY_CYCLE = (int)(pow(2, redPWMResolution) - 1);
+const int greenPWMFreq = 8000; /* 8 KHz */
+const int greenPWMChannel = 2;
+const int greenPWMResolution = 13;
+const int GREEN_MAX_DUTY_CYCLE = (int)(pow(2, greenPWMResolution) - 1);
+const int bluePWMFreq = 10000; /* 10 KHz */
+const int bluePWMChannel = 4;
+const int bluePWMResolution = 14;
+const int BLUE_MAX_DUTY_CYCLE = (int)(pow(2, bluePWMResolution) - 1);
+const int ADC_RESOLUTION = 4095; /* 12-bit */
+void setup()
+{
+  /* Initialize Serial Port */
+  Serial.begin(115200);
+  /* Initialize PWM Channels with Frequency and Resolution */
+  ledcSetup(redPWMChannel, redPWMFreq, redPWMResolution);
+  ledcSetup(greenPWMChannel, greenPWMFreq, greenPWMResolution);
+  ledcSetup(bluePWMChannel, bluePWMFreq, bluePWMResolution);
+  /* Attach the LED PWM Channel to the GPIO Pin */
+  ledcAttachPin(redLEDPin, redPWMChannel);
+  ledcAttachPin(greenLEDPin, greenPWMChannel);
+  ledcAttachPin(blueLEDPin, bluePWMChannel);
+}
+void loop()
+{
+  /* Read Analog Input from three ADC Inputs */
+  redDutyCycle = analogRead(A0);
+  greenDutyCycle = analogRead(A3);
+  blueDutyCycle = analogRead(A4);
+  /* Map ADC Output to maximum possible dutycycle */
+  //redDutyCycle = map(redDutyCycle, 0, ADC_RESOLUTION, 0, RED_MAX_DUTY_CYCLE);
+  greenDutyCycle = map(greenDutyCycle, 0, ADC_RESOLUTION, 0, GREEN_MAX_DUTY_CYCLE);
+  blueDutyCycle = map(blueDutyCycle, 0, ADC_RESOLUTION, 0, BLUE_MAX_DUTY_CYCLE);
+  /* Set PWM Output of Channel with desired dutycycle */
+  ledcWrite(redPWMChannel, redDutyCycle);
+  ledcWrite(greenPWMChannel, greenDutyCycle);
+  ledcWrite(bluePWMChannel, blueDutyCycle);
+  Serial.println("RED -- GREEN -- BLUE");
+  Serial.print(redDutyCycle);
+  Serial.print(" -- ");
+  Serial.print(greenDutyCycle);
+  Serial.print(" -- ");
+  Serial.print(blueDutyCycle);
+  Serial.print("\n");
+  delay(1000);
+}
+</code>
+{{ :start:esp32:esp32-pwm-adc.jpg?direct&600 |}}