succd: Use tigher hysteresis values

It seems we can get away with less hysteresis still.  Make the values a
bit smaller.

succbone/succd/index.html

@@ -5,12 +5,11 @@
 <link rel="shortcut icon" type="image/png" href="/favicon.png">
 <style>
 body {
-    font-size: 14px;
+    font-size: 12px;
     padding: 2em;
 }
 table {
     font-size: 40px;
-    margin-top: 1em;
 }
 table.status td {
     width: 2em;
@@ -52,6 +51,16 @@ td > span {
 .logo > img {
     height: 10em;
 }
+
+.main-grid {
+    margin: 2em;
+    clear: both;
+
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(50em, 1fr));
+    column-gap: 2em;
+    row-gap: 2em;
+}
 </style>
 
 <div class="logo"><img src="/favicon.png" /></div>
@@ -59,19 +68,7 @@ td > span {
 <h1>succd</h1>
 <h2>nothing more permanent than a temporary solution</h2>
 
-<p style="margin-top: 2em; clear: both;">
-    <table>
-        <tr>
-            <th rowspan="2">Pirani Gauge</th>
-            <th>Voltage</th>
-            <td id="volts">{{ .Pirani.Volts }}</td>
-        </tr>
-        <tr>
-            <th>Pressure</th>
-            <td id="mbar">{{ .Pirani.Mbar }}</td>
-        </tr>
-    </table>
-
+<div class="main-grid">
     <table class="status">
         <tr>
             <th>Thresholds</th>
@@ -96,6 +93,19 @@ td > span {
         </tr>
     </table>
 
+    <table>
+        <tr>
+            <th rowspan="2">Pirani Gauge</th>
+            <th>Voltage</th>
+            <td id="volts">{{ .Pirani.Volts }}</td>
+        </tr>
+        <tr>
+            <th>Pressure</th>
+            <td id="mbar">{{ .Pirani.Mbar }}</td>
+        </tr>
+    </table>
+
+
     <table>
         <tr>
             <th rowspan="3">Control</th>
@@ -122,13 +132,14 @@ td > span {
             <th>Status</th>
             <td id="status" colspan="1">OK</td>
             <th>Load</th>
-            <td id="load" colspan="1">...</td>
+            <td id="load" colspan="1" style="width: 4em;">...</td>
         </tr>
     </table>
-</p>
-<p style="margin-top: 2em;">
+
+    <p>
         <canvas id="graph" width="1024" height="512" style="max-width: 100%;"></canvas>
-</p>
+    </p>
+</div>
 
 <p style="font-style: italic; font-size: 12px; margin-top: 5em;">
     {{ .System.Hostname }} | load: {{ .System.Load }} | <a href="/debug/pprof">pprof</a> | <a href="/metrics">metrics</a> | ws ping: <span id="ping">…</span>

succbone/succd/main.go

@@ -14,14 +14,18 @@ var (
 	flagFake                             bool
 	flagListenHTTP                       string
 	flagPressureThresholdRough           = ScientificNotationValue(1e-1)
+	flagPressureThresholdRoughHysteresis = ScientificNotationValue(2e-2)
 	flagPressureThresholdHigh            = ScientificNotationValue(1e-4)
+	flagPressureThresholdHighHysteresis  = ScientificNotationValue(2e-5)
 )
 
 func main() {
 	flag.BoolVar(&flagFake, "fake", false, "Enable fake mode which allows to run succd for tests outside the succbone")
 	flag.StringVar(&flagListenHTTP, "listen_http", ":8080", "Address at which to listen for HTTP requests")
 	flag.TextVar(&flagPressureThresholdRough, "pressure_threshold_rough", &flagPressureThresholdRough, "Threshold for opening up diffusion pump (mbar)")
+	flag.TextVar(&flagPressureThresholdRoughHysteresis, "pressure_threshold_rough_hysteresis", &flagPressureThresholdRoughHysteresis, "+-Hysteresis for rough threshold (mbar)")
 	flag.TextVar(&flagPressureThresholdHigh, "pressure_threshold_high", &flagPressureThresholdHigh, "Threshold for enabling high voltage circuits (mbar)")
+	flag.TextVar(&flagPressureThresholdHighHysteresis, "pressure_threshold_high_hysteresis", &flagPressureThresholdHighHysteresis, "+-Hysteresis for high threshold (mbar)")
 	flag.Parse()
 
 	ctx, _ := signal.NotifyContext(context.Background(), os.Interrupt)
@@ -32,7 +36,9 @@ func main() {
 	d.daemonState.piraniVolts100.limit = 100
 
 	d.aboveRough.threshold = float64(flagPressureThresholdRough)
+	d.aboveRough.hysteresis = float64(flagPressureThresholdRoughHysteresis)
 	d.aboveHigh.threshold = float64(flagPressureThresholdHigh)
+	d.aboveHigh.hysteresis = float64(flagPressureThresholdHighHysteresis)
 	if flagFake {
 		klog.Infof("Starting with fake peripherals")
 		d.adcPirani = &fakeADC{}

succbone/succd/process_blocks.go

@@ -30,13 +30,20 @@ type thresholdOutput struct {
 	debounce time.Time
 	// threshold is the setpoint of the block.
 	threshold float64
+	// hysteresis around the process setpoint (min/max is threshold +- hysteresis)
+	hysteresis float64
 }
 
 func (t *thresholdOutput) process(value float64) {
 	if time.Now().Before(t.debounce) {
 		return
 	}
-	new := value > t.threshold
+	new := t.output
+	if t.output {
+		new = value > (t.threshold - t.hysteresis)
+	} else {
+		new = value > (t.threshold + t.hysteresis)
+	}
 	if new != t.output {
 		t.output = new
 		t.debounce = time.Now().Add(time.Second * 5)

succbone/succd/process_blocks_test.go

@@ -27,19 +27,36 @@ func TestMomentaryOutput(t *testing.T) {
 func TestThresholdOutput(t *testing.T) {
 	to := thresholdOutput{
 		threshold:  1,
+		hysteresis: 0.2,
 	}
-	to.process(0)
+	to.process(0.7)
 	if to.output {
 		t.Fatalf("output shouldn't have triggered")
 	}
-	to.process(2)
+	to.process(1)
+	if to.output {
+		t.Fatalf("output shouldn't have triggered")
+	}
+	to.process(1.3)
 	if !to.output {
 		t.Fatalf("output should have triggered")
 	}
-	to.process(0)
+	to.process(1)
+	if !to.output {
+		t.Fatalf("output should have triggered")
+	}
+	to.process(0.7)
 	if !to.output {
 		t.Fatalf("output should have triggered (in debounce)")
 	}
+
+	// let debounce timeout pass
+	time.Sleep(time.Second * 6)
+
+	to.process(0.7)
+	if to.output {
+		t.Fatalf("output shouldn't have triggered")
+	}
 }
 
 func TestRingbufferInput(t *testing.T) {