This is yet another simple test of a new hardware component that I haven’t played with before. Buzzer is an audio device which may be mechanical, electromechanical, or piezoelectric. It can generate from quite awful UPS-like siren to melodious tone; it really depends on how you want to use it. I just wanted to make noise like that of a UPS does when electricity goes off.
The rest of the post can be found here.
BiPolar LEDs have 3 three legs. One goes to ground, and the other 2 represents two different colors in the same LED. In my case, they are green and red. I have also used a variant of Arduino Nano in order to reduce the size of the experiment. Here’s the list of connections that I have made:
| LED’s ground leg | 220 ohm resistor |
| 220 ohm resistor | Arduino’s ground |
| LED’s one leg | Arduino’s Digital Pin 12 |
| LED’s other leg | Arduino’s Digital Pin 13 |
My intention was to blink the colors alternatively. Green, red, green, red, green… with a 1-second delay in between. The code is as simple as one can imagine. There’s really nothing novel going on here:
int green = 12;
int red = 13;
void setup() {
pinMode(green, OUTPUT);
pinMode(red, OUTPUT);
}
void loop() {
digitalWrite(green, HIGH);
digitalWrite(red, LOW);
delay(1000);
digitalWrite(green, LOW);
digitalWrite(red, HIGH);
delay(1000);
}
Here’s the final outcome:
