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libraries/ESP32Servo/examples/AllOutputsSimultaneous/AllOutputsSimultaneous.ino

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+/*
+ * AllOutputsSimultaneous
+ *
+ * This example demonstrates driving all 20 available PWM outputs simultaneously
+ * on the ESP32 S3 using a mix of MCPWM and LEDC hardware.
+ *
+ * The ESP32 S3 supports 20 PWM channels:
+ * - 8 LEDC channels (shared timers)
+ * - 12 MCPWM channels (6 timers × 2 operators each for shared frequency)
+ *
+ * This example uses:
+ * - 12 ESP32PWM objects with default settings (MCPWM, shared frequency)
+ * - 8 ESP32PWM objects with variable frequency (LEDC channels)
+ *
+ * Circuit:
+ * Connect servo motors or LEDs to the PWM pins listed below.
+ * Ensure adequate power supply for servos (ESP32 3.3V may not be sufficient).
+ */
+
+#include <ESP32PWM.h>
+
+// ESP32 S3 PWM pins: 1-21, 35-45, 47-48
+// We'll use 20 pins from the available ones
+int pwmPins20[20] = {
+  1, 2, 3, 4, 5, 6, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,  // 15 pins
+ 37, 38, 39  // 5 more = 20 total
+};
+
+ESP32PWM* pwms[20];  // Array of 20 PWM objects
+
+int duty = 0;        // Current duty cycle (0-255 for 8-bit resolution)
+int increment = 1;   // Duty increment
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Setting up 20 simultaneous PWM outputs...");
+
+  // Allocate all LEDC timers for maximum LEDC channels
+  ESP32PWM::allocateTimer(0);
+  ESP32PWM::allocateTimer(1);
+  ESP32PWM::allocateTimer(2);
+  ESP32PWM::allocateTimer(3);
+
+  // Create first 12 PWM objects with default settings (MCPWM, shared frequency)
+  // These will share timers and thus frequencies
+  for (int i = 0; i < 20; i++) {
+    pwms[i] = new ESP32PWM(false);  // false = shared frequency
+    pwms[i]->attachPin(pwmPins20[i], 50, 10);  // 50Hz, 10-bit resolution
+    if (pwms[i]->attached()) {
+      Serial.printf("Attached PWM %d to pin %d (MCPWM shared)\n", i, pwmPins20[i]);
+    } else {
+      Serial.printf("Failed to attach PWM %d to pin %d\n", i, pwmPins20[i]);
+    }
+  }
+
+  Serial.printf("Total PWM channels remaining: %d\n", ESP32PWM::channelsRemaining());
+  Serial.println("Setup complete. Starting simultaneous PWM sweep...");
+}
+
+void loop() {
+  // Set all PWM outputs to the same duty cycle for simultaneous control
+  for (int i = 0; i < 20; i++) {
+    pwms[i]->writeScaled((float)duty / 255.0);  // Convert to 0.0-1.0 range
+  }
+
+  Serial.printf("All PWM outputs set to duty cycle: %d/255\n", duty);
+
+  // Update duty cycle
+  duty += increment;
+  if (duty >= 255 || duty <= 0) {
+    increment = -increment;  // Reverse direction at limits
+  }
+
+  delay(10);  // Small delay for visible changes
+}