simple-pwm-led

examples/simple-pwm-led/.gitignore

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+build-*

examples/simple-pwm-led/Makefile

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+# This will only work if you have installed arduino-mk
+# And set your shell rc with the following env variables:
+#
+#        export ARDUINO_DIR=/usr/share/arduino
+#        export ARDMK_DIR=/usr/share/arduino
+#
+# Adjust to reflect your own paths!
+
+BOARD_TAG	= nano328
+MONITOR_PORT	= /dev/ttyUSB0
+
+include ${ARDMK_DIR}/Arduino.mk

examples/simple-pwm-led/README

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+This is a bare Makefile project sample to work with ino files, and makes use
+of the arduino-make/arduino-mk Makefile framework that aims to provide all of
+the IDE functionalities but via a Makefile.
+
+See https://github.com/sudar/Arduino-Makefile
+
+Once installed you need to set at least these two env variables to be able to
+use the Makefile:
+
+  export ARDUINO_DIR=/usr/share/arduino
+  export ARDMK_DIR=/usr/share/arduino
+  
+Adjust to reflect your own paths! Put that in your shell rc!
+

examples/simple-pwm-led/pwm-led.ino

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+/*
+  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
+}