Reflection
For this project I decided to stick with a very traditional doorbell, just press the “button” outside and then there will be a “ding dong” or in this case a buzzing sound. I used the code from the resources ‘7 capacitive touch sensors’ but edited it to just 2 capacitive touch sensors. I used the lid from my previous music box project as the door. Then, I just used copper tape and an alligator clip, so when I would touch the copper take from one side, there would be a buzzing sound. Once it was done it worked, but I decided to include an led on the ‘inside’ so it would notify the person inside in case they didn’t hear the buzzing. In this case I would consider this the role of (growth) mindset, since I wanted to try something new.
However, I was not able to get it to work how I wanted it. Both the light and the buzzing sound would start as soon as I connected the negative leg of the led to a ground pin. I’m not sure if it was because I did not do the circuit part well, or if it was the coding part that I needed to change. So, I just left it like that, although it didn’t work like I thought it would, it still is an interactive project. Once I touched the negative leg of the led with the alligator clip, it started buzzing and the light flickered.
Final product
https://photos.app.goo.gl/Rh3opjggC1fdeJeA9
Code
// 2 capacitive touch sensors: A4 - A5
#include <Adafruit_CircuitPlayground.h>
#define NOTE_G3 196
// we light one pixel at a time, this is our counter
uint8_t pixeln = 0;
int capSensorPins[] = { 3, 2 };
int numCapSensors = 2;
int ledForCap[] = { 0, 1, 3, 4, 6, 8, 9 };
// { 3, 2, 0}
// { A4, A5}
// 3 -> A4, 2 -> A5, 0
int THRESHOLD = 1000;
void setup() {
Serial.begin(9600);
CircuitPlayground.begin();
}
void loop() {
// for each pin that could be a capacitive touch sensor
for (int i = 0; i < numCapSensors; i++)
{
// print the information about what we are sensing
Serial.print("Capsense #");
Serial.print(capSensorPins[i]);
Serial.print(": ");
Serial.println(CircuitPlayground.readCap(capSensorPins[i]));
// if the value we sense is large enough
if (CircuitPlayground.readCap(capSensorPins[i]) > THRESHOLD)
// light the associated neopixel
CircuitPlayground.setPixelColor(ledForCap[i], CircuitPlayground.colorWheel(25 * i));
else
// otherwise, clear out the light for that neopixel
CircuitPlayground.setPixelColor(ledForCap[i], 0, 0, 0);
}
// let's also play a note for one of them, as an example
// we'll pick pin 3, which is labeled SCL/A4 on the board
// if the value is large enough
if ( CircuitPlayground.readCap( 3 ) > THRESHOLD)
// play the note (only if the slide switch is on)
playNote( NOTE_G3, 250 );
delay(50);
}
// Play a note of the specified frequency and for the specified duration.
// No tones will play if the slide switch is in the -/off position.
void playNote(int frequency, int duration) {
// Check if the slide switch is off
if (!CircuitPlayground.slideSwitch()) {
// stop immediately without playing anything.
return;
} else {
// Play the note for the specified duration.
CircuitPlayground.playTone(frequency, duration, false);
// wait for the note to play
delay(duration + duration / 16);
}
}