{"id":123,"date":"2015-09-23T03:56:16","date_gmt":"2015-09-23T03:56:16","guid":{"rendered":"http:\/\/www.aaronparsekian.com\/?p=123"},"modified":"2015-09-23T03:56:16","modified_gmt":"2015-09-23T03:56:16","slug":"3rd-assignment-digital-and-analog-labs","status":"publish","type":"post","link":"http:\/\/www.aaronparsekian.com\/?p=123","title":{"rendered":"3rd Assignment – Digital and Analog Labs"},"content":{"rendered":"

This week we started to use the Arduino to input and output analog signals.<\/p>\n

Beginning with a simple pushbutton to turn on an LED:<\/p>\n

\"button_pin2\"<\/a><\/p>\n

void setup() {
\npinMode(2, INPUT); \/\/ set the switch pin to be an input
\npinMode(3, OUTPUT); \/\/ set the yellow LED pin to be an output
\npinMode(4, OUTPUT); \/\/ set the red LED pin to be an output
\n}
\nvoid loop() {
\n\/\/ read the switch input:
\nif (digitalRead(2) == HIGH) {
\n\/\/ if the switch is closed:
\ndigitalWrite(3, HIGH); \/\/ turn on the yellow LED
\ndigitalWrite(4, LOW); \/\/ turn off the red LED
\n}
\nelse {
\n\/\/ if the switch is open:
\ndigitalWrite(3, LOW); \/\/ turn off the yellow LED
\ndigitalWrite(4, HIGH); \/\/ turn on the red LED
\n}
\n}
\n<\/code>
\nNext we worked with analog inputs:<\/p>\n


\nconst int ledPin = 9; \/\/ pin that the LED is attached to
\nint analogValue = 0; \/\/ value read from the pot
\nint brightness = 0; \/\/ PWM pin that the LED is on.
\nvoid setup() {
\n\/\/ initialize serial communications at 9600 bps:
\nSerial.begin(9600);
\n\/\/ declare the led pin as an output:
\npinMode(ledPin, OUTPUT);
\n}
\nvoid loop() {
\nanalogValue = analogRead(A0); \/\/ read the pot value
\nbrightness = analogValue \/4; \/\/divide by 4 to fit in a byte
\nanalogWrite(ledPin, brightness); \/\/ PWM the LED with the brightness value
\nSerial.println(brightness); \/\/ print the brightness value back to the serial monitor
\n}
\n<\/code>
\nHere is the code outputting to a potentiometer:<\/p>\n