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146 | // ====================== OLED
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
// ===================== touch
#define PIN_GREEN 16
#define N_TOUCH 6
#define THRESHOLD 6
// ====================== OLED
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define SCREEN_ADDRESS 0x3C // 0x3D or 0x3C depending on brand
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1, 1700000UL, 1700000UL);
// ===================== touch
int touch_pins[N_TOUCH] = { 3, 4, 2, 27, 1, 26 }; //(A,B,Down,Left,Right,Up)
int touch_values[N_TOUCH] = { 0, 0, 0, 0, 0, 0 };
bool pin_touched_now[N_TOUCH] = { false, false, false, false, false, false };
bool pin_touched_past[N_TOUCH] = { false, false, false, false, false, false };
void update_touch() {
int t;
int t_max = 200;
int p;
for (int i = 0; i < N_TOUCH; i++) {
p = touch_pins[i];
// set to low
pinMode(p, OUTPUT);
digitalWriteFast(p, LOW);
// settle
delayMicroseconds(25);
// enable pull-up
pinMode(p, INPUT_PULLUP);
// measure time to rise
t = 0;
while (!digitalReadFast(p) && t < t_max) {
t++;
}
touch_values[i] = t;
// update state
pin_touched_past[i] = pin_touched_now[i];
pin_touched_now[i] = touch_values[i] > THRESHOLD;
}
}
void print_touch() {
char print_buffer[30];
for (int i = 0; i < N_TOUCH; i++) {
sprintf(print_buffer, "%4d ", touch_values[i]);
Serial.print(print_buffer);
}
Serial.println("");
}
// ====================== OLED
void drawBackground() {
display.drawRect(21, 1, 22, 60, 1);
display.drawCircle(80, 31, 12, 1);
display.drawCircle(110, 17, 12, 1);
display.drawRect(2, 20, 60, 22, 1);
display.setTextColor(1);
display.setTextWrap(false);
}
void setup() {
// initialize Serial port
Serial.begin(115200);
// ===================== touch
// initialize LED
pinMode(PIN_GREEN, OUTPUT);
// HIGH = LED off (they're connected to VCC instead of ground)
digitalWrite(PIN_GREEN, HIGH);
// ====================== OLED
// give the screen some time to power up
delay(50);
// initialize display
display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS);
display.clearDisplay();
// text settings
display.setTextSize(1);
display.setTextColor(SSD1306_WHITE);
drawBackground();
display.display();
}
void loop() {
// ===================== touch
// update the touch sensors
update_touch();
// ====================== OLED
// clear the buffer
display.clearDisplay();
drawBackground();
if (pin_touched_now[0]) {
display.setCursor(78, 28);
display.print("A");
digitalWrite(PIN_GREEN, LOW);
} else {
digitalWrite(PIN_GREEN, HIGH);
}
// Other possisions
// display.setCursor(29, 7);
// display.print("U");
// display.setCursor(29, 48);
// display.print("D");
// display.setCursor(9, 28);
// display.print("L");
// display.setCursor(49, 28);
// display.print("R");
// display.setCursor(78, 28);
// display.print("A");
// display.setCursor(108, 14);
// display.print("B");
// print values to Serial, for debugging
print_touch();
// slow down the loop to not print too fast (optional)
delay(50);
display.display();
}
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