-

basics/simple-pwm-led/pwm-led/pwm-led.ino

@@ -0,0 +1,41 @@
+/*
+  LED PWM
+  Uses 2 pots to control the duty cycle of a Pulse Width Modulation
+  
+  <---- pot 0 ---->           <---- pot 0 ---->
+                  |           |               |
+                  |           |               |
+                  |           |               |
+                  <-- pot 1 -->               <--- ...
+*/
+
+#define LED (13)
+#define POT_1 (0)
+#define POT_2 (1)
+
+int delay_on;
+int delay_off;
+
+void setup() {                
+	// initialize the digital pin as an output.
+	// Pin 13 has an LED connected on the nano board:
+	pinMode(LED, OUTPUT);     
+}
+
+void loop() {
+        // We read the value of the pots at the beginning of the loop
+        // and store them as integer variables (declared at the top)
+        //delay_on  = analogRead(POT_1);
+        //delay_off = analogRead(POT_2);
+        //
+        // But in meergranen PCB 1.0, the pots are wired the wrong way
+        // So we need to adjust that :)
+        delay_on  = 1023 - analogRead(POT_1);
+        delay_off = 1023 - analogRead(POT_2);
+
+        // Parameters for the PWM
+        digitalWrite(LED, HIGH);        // turn the LED on
+        delay(delay_on);                // wait for delay_on ms
+        digitalWrite(LED, LOW);         // turn the LED off
+        delay(delay_off);               // wait for delay_off ms
+}