don't request mic access until threshold initially changed

src/components/timer.vue

@@ -77,6 +77,8 @@
 				this.running = true;
 				this.intervalID = setInterval(()=>{
 
+					if(this.micLevel > -1){
+
 						const array = new Uint8Array(this.analyser.frequencyBinCount);
 						this.analyser.getByteFrequencyData(array);
 						const arraySum = array.reduce((a, value) => a + value, 0);
@@ -89,6 +91,8 @@
 							this.micThresholdExceeded = false;
 						}
 
+					}
+
 					this.totalSeconds = getAccumulatedSeconds(Date.now(), this.startTime) - this.secondsToSubtract + this.savedPreviousSeconds;
 					window.localStorage.setItem('lastTotalSeconds', this.totalSeconds);
 
@@ -112,12 +116,10 @@
 				this.savedPreviousSeconds = this.totalSeconds;
 				this.secondsToSubtract = 0;
 				window.localStorage.setItem('lastTotalSeconds', this.totalSeconds);
-			}
 			},
-		mounted() {
-			axios.get(import.meta.env.VITE_PRACTICE_TRACKER_API_URL+'categories').then((response)=>{
-				this.categories = response.data
-			})
+			activateMic(){
+
+				if(this.micThreshold > -1){
 
 					navigator.mediaDevices.getUserMedia({
 						audio: true
@@ -141,6 +143,15 @@
 					});
 
 				}
+
+			}
+		},
+		mounted() {
+			axios.get(import.meta.env.VITE_PRACTICE_TRACKER_API_URL+'categories').then((response)=>{
+				this.categories = response.data
+			})
+
+		}
 	}
 </script>
 
@@ -150,7 +161,8 @@
 		<em>
 			{{formatTime(totalSeconds)}}
 		</em>
-		Mic Threshold (current level: {{Math.round(micLevel)}}): <input type="number" v-model="micThreshold"/>
+		Mic Threshold (current level: {{Math.round(micLevel)}}):
+		<input type="number" @change="activateMic" v-model="micThreshold"/>
 		<button :disabled="running" @click="start">Start</button>
 		<button :disabled="!running" @click="stop">Stop</button>
 		<button :disabled="running || totalSeconds === 0" @click="reset">Reset</button>