Capacitive Touch Macro Keypad

prusaprinters

<p>This is a multi-material print that uses a conductive filament and an insulating filament. All you need is an Adafruit circuit playground and 8 screws. I have also included some basic code to help you get started (adapted from Carter Nelson's code, link below).<br/> <a href="https://www.arduino.cc/en/Reference/MouseKeyboard">https://www.arduino.cc/en/Reference/MouseKeyboard</a></p> <p>It won't let me upload the .ino file so here is a copy of my code:</p> <p>////////////////////////////////////////////////////////////////////////////<br/> // Circuit Playground Capacitive Touch Tones<br/> //<br/> // Send keyboard and mouse events for each touch pad.<br/> // <a href="https://www.arduino.cc/en/Reference/MouseKeyboard">https://www.arduino.cc/en/Reference/MouseKeyboard</a><br/> //<br/> // Author: Carter Nelson<br/> // MIT License (<a href="https://opensource.org/licenses/MIT">https://opensource.org/licenses/MIT</a>)</p> <h3>include &lt;Adafruit_CircuitPlayground.h&gt;</h3> <h3>include &lt;Keyboard.h&gt;</h3> <h3>define CAP_THRESHOLD 100</h3> <h3>define DEBOUNCE 250</h3> <p>uint8_t pads[] = {3, 2, 0, 1, 12, 6, 9, 10};<br/> uint8_t numberOfPads = sizeof(pads)/sizeof(uint8_t);</p> <p>boolean emulatorActive = false;</p> <p>uint32_t colors[] = {<br/> 0xFF0000,<br/> 0xff9900,<br/> 0xccff00,<br/> 0x33ff00,<br/> 0x00ff66,<br/> 0x00ffff,<br/> 0x0066ff,<br/> 0x3300ff,<br/> 0xff0099,<br/> 0x000000<br/> };</p> <p>int colorIndex;<br/> int startIndex;</p> <p>void action1(){<br/> ctrlalt('q');<br/> }<br/> void action2(){<br/> ctrlalt('w');<br/> }<br/> void action3(){<br/> ctrlalt('e');<br/> }<br/> void action4(){<br/> ctrlalt('r');<br/> }<br/> void action5(){<br/> ctrlalt('t');<br/> }<br/> void action6(){<br/> ctrlalt('y');<br/> }<br/> void action7(){<br/> ctrlalt('u');<br/> }<br/> void action8(){<br/> ctrlalt(8);<br/> }</p> <p>void ctrlalt(int x){<br/> Keyboard.press(KEY_LEFT_CTRL);<br/> Keyboard.press(KEY_LEFT_ALT);<br/> Keyboard.press(char(x));<br/> delay(100);<br/> Keyboard.releaseAll();<br/> }</p> <p>////////////////////////////////////////////////////////////////////////////<br/> void takeAction(uint8_t pad) {<br/> Serial.print("PAD "); Serial.println(pad);<br/> switch (pad) {<br/> case 3:<br/> action1();<br/> break;<br/> case 2:<br/> action2();<br/> break;<br/> case 0:<br/> action3();<br/> break;<br/> case 1:<br/> action4();<br/> break;<br/> case 12:<br/> action5();<br/> break;<br/> case 6:<br/> action6();<br/> break;<br/> case 9:<br/> action7();<br/> break;<br/> case 10:<br/> action8();<br/> break;<br/> default:<br/> Serial.println("Error");<br/> }<br/> }</p> <p>////////////////////////////////////////////////////////////////////////////<br/> boolean capButton(uint8_t pad) {<br/> // Check if capacitive touch exceeds threshold.<br/> if (CircuitPlayground.readCap(pad) &gt; CAP_THRESHOLD) {<br/> return true;<br/> } else {<br/> return false;<br/> }<br/> }</p> <p>////////////////////////////////////////////////////////////////////////////<br/> void sendKey(char key) {<br/> Keyboard.press(key);<br/> Keyboard.releaseAll();<br/> }</p> <p>////////////////////////////////////////////////////////////////////////////<br/> void setup() {<br/> CircuitPlayground.begin();</p> <p>// Make it bright!<br/> CircuitPlayground.setBrightness(255);</p> <p>// Start at the beginning<br/> startIndex = 0;</p> <p>// Initialize serial.<br/> Serial.begin(9600);</p> <p>// Initialize Circuit Playground library.<br/> CircuitPlayground.begin();<br/> }</p> <p>////////////////////////////////////////////////////////////////////////////<br/> void loop() {<br/> // Indicate emulator status on red LED.<br/> CircuitPlayground.redLED(emulatorActive);<br/> CircuitPlayground.clearPixels();</p> <p>// Loop through each pixel, setting their colors<br/> colorIndex = startIndex;<br/> for (int pixel=0; pixel&lt;10; pixel++) {<br/> CircuitPlayground.setPixelColor(pixel, colors[colorIndex]);<br/> colorIndex++;<br/> if (colorIndex &gt; 9) colorIndex = 0;<br/> }</p> <p>// Increment start index into color array<br/> startIndex++;</p> <p>// Check value and reset if necessary<br/> if (startIndex &gt; 9) startIndex = 0;</p> <p>//Checks the pads 20x for every Neopixel update<br/> int tickRate = 20;<br/> for (int i = 0; i &lt; tickRate; i++){<br/> // Check slide switch.<br/> if (!CircuitPlayground.slideSwitch()) {</p> <pre><code> //-----------| EMULATOR OFF |------------- if (emulatorActive) { Keyboard.end(); emulatorActive = false; } } else { //-----------| EMULATOR ON |------------- if (!emulatorActive) { Keyboard.begin(); emulatorActive = true; } // Loop over every pad. for (int i=0; i&lt;numberOfPads; i++) { // Check if pad is touched. if (capButton(pads[i])) { // Do something. takeAction(pads[i]); // But not too often. delay(DEBOUNCE); } } } </code></pre> <p>}<br/> }</p>