diff --git a/V1/led5/src/main.rs b/V1/led5/src/main.rs
index 193d6f4..6ef43cb 100644
--- a/V1/led5/src/main.rs
+++ b/V1/led5/src/main.rs
@@ -103,7 +103,9 @@ fn run(rdone: chan::Receiver<()>) {
     set_direction(GPIO_PORT_LED, GPIO_DIRECTION_OUT);
 
     let tick = chan::tick(Duration::from_millis(1000 / 5));
-    let mut on = false;
+    let mut btn_last = false;
+    let mut led_on = false;
+    let mut enabled = true;
 
     loop {
         chan_select! {
@@ -111,20 +113,22 @@ fn run(rdone: chan::Receiver<()>) {
                 #[cfg(debug_assertions)]
                 println!("tick");
 
-                let btn = get_value(GPIO_PORT_BTN);
-
-                if btn == GPIO_BTN_ON {
-                    on = !on;
-                } else {
-                    on = false;
+                // switch enabled if button state changed
+                let btn = get_value(GPIO_PORT_BTN) == GPIO_BTN_ON;
+                if btn && btn != btn_last {
+                    enabled = !enabled;
                 }
 
-                if on {
+                // set led state
+                if led_on {
                     set_value(GPIO_PORT_LED, GPIO_LED_ON);
                 }
                 else {
                     set_value(GPIO_PORT_LED, GPIO_LED_OFF);
                 }
+
+                btn_last = btn;
+                led_on = !led_on;
             },
             rdone.recv() => {
                 // unexport