commit f01ba5e01a1512b37c0b8925a7d3424baff2ae11
Author: Andrew Kesterson <andrew@aklabs.net>
Date:   Wed May 27 09:09:55 2026 -0400

    Add project files for flowing light with button

diff --git a/flowing_light_with_button/.theia/launch.json b/flowing_light_with_button/.theia/launch.json
new file mode 100644
index 0000000..7e4253b
--- /dev/null
+++ b/flowing_light_with_button/.theia/launch.json
@@ -0,0 +1,8 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  "version": "0.2.0",
+  "configurations": [
+  
+  ]
+}
diff --git a/flowing_light_with_button/breadboard.png b/flowing_light_with_button/breadboard.png
new file mode 100644
index 0000000..d9621b1
Binary files /dev/null and b/flowing_light_with_button/breadboard.png differ
diff --git a/flowing_light_with_button/flowing_light_with_button.ino b/flowing_light_with_button/flowing_light_with_button.ino
new file mode 100644
index 0000000..4f136f0
--- /dev/null
+++ b/flowing_light_with_button/flowing_light_with_button.ino
@@ -0,0 +1,73 @@
+
+#define LED_COUNT              8
+#define UP                     1
+#define DOWN                   2
+#define PWM_PRECISION          8
+#define PWM_VALUE_MAX          1 << PWM_PRECISION
+#define PIN_BUTTON             13
+#define BUTTON_UP              1
+#define BUTTON_BOUNCING        2
+#define BUTTON_DOWN            3
+#define BUTTON_HELD            4
+
+const byte ledPins[] = {21, 47, 38, 39, 40, 41, 42, 2};  //define led pins
+const byte chns[] = {0, 1, 2, 3, 4, 5, 6, 7};  //define the pwm channels
+int pwmvalues[] = {1, 1 << 1, 1 << 2, 1 << 3, 1 << 4, 1 << 5, 1 << 6, 1 << 7};
+char velocities[] = {DOWN, DOWN, DOWN, DOWN, DOWN, DOWN, DOWN, DOWN};
+int delayTimes = 100;  //flowing speed ,the smaller, the faster
+unsigned long button_bounce_millis = 0;
+char buttonState = BUTTON_UP;
+
+void setup() {
+  for (int i = 0; i < LED_COUNT; i++) {  //setup the pwm channels
+    ledcAttachChannel(ledPins[i], 1000, PWM_PRECISION, chns[i]);
+  }
+  pinMode(PIN_BUTTON, INPUT);
+}
+
+void checkButtonPressed(void) {
+  unsigned long curmillis = millis();
+  if ( digitalRead(PIN_BUTTON) == LOW ) {
+    if ( buttonState == BUTTON_UP ) {
+      button_bounce_millis = millis();
+      buttonState = BUTTON_BOUNCING;
+      return;
+    } else if ( buttonState == BUTTON_BOUNCING && curmillis - button_bounce_millis > 20 ) {
+      if ( digitalRead(PIN_BUTTON) == LOW ) {
+        buttonState = BUTTON_DOWN;
+      }
+    }
+  } else if ( digitalRead(PIN_BUTTON) == HIGH ) {
+    buttonState = BUTTON_UP;
+  }
+}
+
+void loop() {
+  checkButtonPressed();
+  if ( buttonState == BUTTON_DOWN ) {
+    for ( int i = 0; i < LED_COUNT ; i++ ) {
+      if ( velocities[i] == UP) {
+        velocities[i] = DOWN;
+      } else {
+        velocities[i] = UP;
+      } 
+    }
+    buttonState = BUTTON_HELD;
+  }
+
+  for ( int i = 0; i < LED_COUNT ; i++ ) {
+    if ( pwmvalues[i] == 0 ) {
+      velocities[i] = UP;
+      pwmvalues[i] = 1;
+    } else if ( pwmvalues[i] == PWM_VALUE_MAX ) {
+      velocities[i] = DOWN;
+    }
+    if ( velocities[i] == UP ) {
+      pwmvalues[i] = pwmvalues[i] << 1;
+    } else if ( velocities[i] == DOWN ) {
+      pwmvalues[i] = pwmvalues[i] >> 1;
+    }
+    ledcWrite(ledPins[i], pwmvalues[i]);
+  }
+  delay(delayTimes);  
+}