Binary Red/Green Snippet

One step closer…

Switch open yields a killer red LED…

Switch closed yields an uber-sexy green LED…

I even tossed in some 1K resistors to keep my LEDs healthy, in addition to my 100 ohm / 10000 ohm pull-down setup.

+4 resistor

I even managed to comment my code, for a bonus win:

/*
* binary red/green led setup
* by Joseph Swanson
* https://swantron.com
*/

int led1 = 11; // green LED (pin 11)
int led2 = 12; // red LED (pin 12)
int swit= 5; // switch (pin 5)
int varr; // to read pin on/off (pin 5)

void setup() {
pinMode(led1, OUTPUT); // output green
pinMode(led2, OUTPUT); // output red
pinMode(swit, INPUT); // switch input
}

void loop(){
varr = digitalRead(swit); // store swit to varr
if (varr == LOW) { // button = pressed
digitalWrite(led1, HIGH); // trigger green
digitalWrite(led2, LOW); // ground red
}
if (varr == HIGH) { // button != pressed
digitalWrite(led1, LOW); // ground green
digitalWrite(led2, HIGH); // trigger red
}
}

+1 Snippet

I’m getting closer to having this thing behave the way I intend. Stay tuned for a while longer. I’ll have a robot up and rolling in no time whatsoever.