diff --git a/src/thermostat/channel_state.rs b/src/thermostat/channel_state.rs
index e154449..3972ef9 100644
--- a/src/thermostat/channel_state.rs
+++ b/src/thermostat/channel_state.rs
@@ -34,10 +34,17 @@ pub struct ChannelState {
 }
 
 impl ChannelState {
-    pub fn new(adc_calibration: ad7172::ChannelCalibration) -> Self {
+    fn adc_calibration(mut self, adc_calibration: ad7172::ChannelCalibration) -> Self {
+        self.adc_calibration = adc_calibration;
+        self
+    }
+}
+
+impl Default for ChannelState {
+    fn default() -> Self {
         ChannelState {
             adc_data: None,
-            adc_calibration,
+            adc_calibration: ad7172::ChannelCalibration::default(),
             adc_time: Instant::from_secs(0),
             // default: 10 Hz
             adc_interval: Duration::from_millis(100),
@@ -48,6 +55,12 @@ impl ChannelState {
             sh: sh::Parameters::default(),
         }
     }
+}
+
+impl ChannelState {
+    pub fn new(adc_calibration: ad7172::ChannelCalibration) -> Self {
+        ChannelState::default().adc_calibration(adc_calibration)
+    }
 
     pub fn update(&mut self, now: Instant, adc_data: u32) {
         self.adc_data = if adc_data == ad7172::MAX_VALUE {