diff --git a/src/main.rs b/src/main.rs
index f9a0e35..fcd4749 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -162,7 +162,7 @@ fn main() -> ! {
                         laser.power_down();
                         thermostat.power_down();
                     }
-
+                    thermostat.process_tec_readings();
                     thermostat.start_tec_readings_conversion();
                 }
 
diff --git a/src/thermostat/max1968.rs b/src/thermostat/max1968.rs
index 471df8a..df99ec9 100644
--- a/src/thermostat/max1968.rs
+++ b/src/thermostat/max1968.rs
@@ -78,6 +78,8 @@ pub struct MAX1968 {
     pub pins_adc: Adc<ADC1>,
     pub dma_adc: DMA_Transfer<Stream2<DMA2>, 1, Adc<ADC2>, PeripheralToMemory, &'static mut [u16; 16]>,
     pub dac_out_range: ElectricPotential,
+    vtec_volt_iir: u16,
+    itec_volt_iir: u16,
     prev_vtec_volt: ElectricPotential,
     prev_itec_volt: ElectricPotential,
 }
@@ -243,6 +245,8 @@ impl MAX1968 {
             pins_adc: pins_adc1,
             dma_adc: dma_adc,
             dac_out_range: dac_out_range,
+            vtec_volt_iir: 1861, // VTEC value centers at 1.5V
+            itec_volt_iir: 1861, // ITEC value centers at 1.5V
             prev_vtec_volt: ElectricPotential::new::<millivolt>(0.0),
             prev_itec_volt: ElectricPotential::new::<millivolt>(0.0),
         }
@@ -261,6 +265,10 @@ impl MAX1968 {
     }
 
     pub fn get_tec_readings(&mut self) -> (ElectricPotential, ElectricPotential) {
+        (self.prev_vtec_volt, self.prev_itec_volt)
+    }
+
+    pub fn cal_tec_readings(&mut self) -> (ElectricPotential, ElectricPotential) {
         if unsafe { DMA_TRANSFER_COMPLETE } {
             let buffer: &[u16; 16];
             unsafe {
@@ -276,18 +284,20 @@ impl MAX1968 {
                 itec += *data;
             }
             itec = itec >> 3;
+            self.itec_volt_iir = (7 * self.itec_volt_iir + itec) >> 3;
 
             let mut vtec: u16 = 0;
             for data in buffer.into_iter().skip(1).step_by(2) {
                 vtec += *data;
             }
             vtec = vtec >> 3;
+            self.vtec_volt_iir = (7 * self.vtec_volt_iir + vtec) >> 3;
 
             unsafe {
                 ADC2_LOCAL_BUFFER = *buffer;
             }
-            self.prev_vtec_volt = ElectricPotential::new::<millivolt>(sample_to_millivolts(vtec) as f32);
-            self.prev_itec_volt = ElectricPotential::new::<millivolt>(sample_to_millivolts(itec) as f32);
+            self.prev_vtec_volt = ElectricPotential::new::<millivolt>(sample_to_millivolts(self.vtec_volt_iir) as f32);
+            self.prev_itec_volt = ElectricPotential::new::<millivolt>(sample_to_millivolts(self.itec_volt_iir) as f32);
         }
         (self.prev_vtec_volt, self.prev_itec_volt)
     }
diff --git a/src/thermostat/thermostat.rs b/src/thermostat/thermostat.rs
index 8748e8d..7fb47c9 100644
--- a/src/thermostat/thermostat.rs
+++ b/src/thermostat/thermostat.rs
@@ -158,6 +158,10 @@ impl Thermostat {
         self.max1968.dma_adc_start_conversion();
     }
 
+    pub fn process_tec_readings(&mut self) {
+        self.max1968.cal_tec_readings();
+    }
+
     fn tec_setup(&mut self) {
         self.power_down();