reaction

Author: BrettMayson

2025/links.html

@@ -120,6 +120,9 @@ <h2>🖼️ Projects</h2>
             <div class="link-item highlight">
                 <a href="rgb.ino" target="_blank">RGB</a>
             </div>
+            <div class="link-item highlight">
+                <a href="reaction.ino" target="_blank">Reaction</a>
+            </div>
             <div class="link-item">
                 <a href="breakout.sb3" target="_blank">Scratch Breakout</a>
                 <div class="description">The breakout game made during camp</div>

2025/reaction.ino

@@ -0,0 +1,63 @@
+#include <LiquidCrystal_I2C.h>
+#include <Wire.h>
+
+#define LED_R 25
+#define LED_G 26
+#define LED_B 27
+#define BUTTON 4
+
+#define SDA 13
+#define SCL 14
+
+LiquidCrystal_I2C lcd(0x27, 16, 2);
+
+void setup() {
+  ledcAttachChannel(LED_R, 1000, 8, 0);
+  ledcAttachChannel(LED_G, 1000, 8, 1);
+  ledcAttachChannel(LED_B, 1000, 8, 2);
+
+  pinMode(BUTTON, INPUT);
+
+  Wire.begin(SDA, SCL);
+  lcd.init();
+  lcd.backlight();
+  lcd.setCursor(0,0);
+  lcd.print("Lets play a game");
+  delay(1000);
+}
+
+void setColor(byte r, byte g, byte b) {
+  ledcWrite(LED_R, 255 - r);
+  ledcWrite(LED_G, 255 - g);
+  ledcWrite(LED_B, 255 - b);
+}
+
+void loop() {
+  lcd.setCursor(0,0);
+  lcd.print("Press button    ");
+  lcd.setCursor(0,1);
+  lcd.print("when green");
+  int wait = random(3,8);
+  for (int i = 0; i < wait; i++) {
+    if (i % 2 == 0) {
+      setColor(255,0,0);
+    } else {
+      setColor(0,0,255);
+    }
+    delay(400);
+  }
+  setColor(0,255,0);
+  unsigned long start = millis();
+  while (digitalRead(BUTTON) == HIGH) {
+    delay(10);
+  }
+  unsigned long end = millis();
+  setColor(0,0,0);
+  unsigned long duration = end - start;
+  lcd.setCursor(0,0);
+  lcd.print("Your score:      ");
+  lcd.setCursor(0,1);
+  lcd.print(duration);
+  lcd.print("            ");
+  delay(2000);
+}