src/channels.rs

@@ -475,6 +475,15 @@ impl Channels {
         serde_json_core::to_vec(&summaries)
     }
 
+    pub fn pid_engaged(&mut self) -> bool {
+        for channel in 0..CHANNELS {
+            if self.channel_state(channel).pid_engaged {
+                return true;
+            }
+        }
+        false
+    }
+
     fn pwm_summary(&mut self, channel: usize) -> PwmSummary {
         PwmSummary {
             channel,

src/command_handler.rs

@@ -187,7 +187,10 @@ impl Handler {
         match pin {
             PwmPin::ISet => {
                 channels.channel_state(channel).pid_engaged = false;
-                leds.g3.off();
+                // Only turn off LED when PID is disengaged on all channels
+                if !channels.pid_engaged() {
+                    leds.g3.off();
+                }
                 let current = ElectricCurrent::new::<ampere>(value);
                 channels.set_i(channel, current);
                 channels.power_up(channel);