diff --git a/src/pid.c b/src/pid.c
--- a/src/pid.c
+++ b/src/pid.c
@@ -12,105 +12,105 @@ static pid_state_t state;
 // Initialize PID loop
 void pid_init()
 {
-	state.i_state = 0;
-	state.last_pid_temp = 0;
-	state.last_pid_temp_frac = 0;
+    state.i_state = 0;
+    state.last_pid_temp = 0;
+    state.last_pid_temp_frac = 0;
 }
 
 
 // Apply PID output values
 float pid_process(void)
 {
-//            #ifdef MAX31865_RTD_SENSOR
-//            max31865_readtemp(spi_get(), &set, &status);
-//			#else
-//			max31855_readtemp(spi_get(), &set, &status); // Read MAX31855
-//			#endif
+    //            #ifdef MAX31865_RTD_SENSOR
+    //            max31865_readtemp(spi_get(), &set, &status);
+    //			#else
+    //			max31855_readtemp(spi_get(), &set, &status); // Read MAX31855
+    //			#endif
 
-	float ssr_output = 0;
+    float ssr_output = 0;
 
 
-	if(runtime_status()->pid_enabled)
-	{
-		// Get ssr output for next time
-		int16_t power_percent = pid_update();
+    if(runtime_status()->pid_enabled)
+    {
+        // Get ssr output for next time
+        int16_t power_percent = pid_update();
 
-		if(flash_getsettings()->val.plant_type == PLANT_COOLER)
-			power_percent *= -1;
+        if(flash_getsettings()->val.plant_type == PLANT_COOLER)
+            power_percent *= -1;
 
-		//power-percent is 0-1000?
-		ssr_output = power_percent; //(((uint32_t)SSR_PERIOD * (uint32_t)10 * (uint32_t)100) * power_percent) / (uint32_t)1000000;
+        //power-percent is 0-1000?
+        ssr_output = power_percent; //(((uint32_t)SSR_PERIOD * (uint32_t)10 * (uint32_t)100) * power_percent) / (uint32_t)1000000;
 
-		// put ssr output on display
-		ssd1306_drawstring("      ", 0, 90); //fixme: this is bad, but I can't get the old digits to clear otherwise
-		char tempstr[8];
-		snprintf(tempstr, 8, "%4.1f%%", ssr_output/10.0);
-		ssd1306_drawstring(tempstr, 0, 85);
-	}
-	else
-	{
-		ssr_output = 0.0;
-	}
+        // put ssr output on display
+        ssd1306_drawstring("      ", 0, 90); //fixme: this is bad, but I can't get the old digits to clear otherwise
+        char tempstr[8];
+        snprintf(tempstr, 8, "%4.1f%%", ssr_output/10.0);
+        ssd1306_drawstring(tempstr, 0, 85);
+    }
+    else
+    {
+        ssr_output = 0.0;
+    }
 
-	return ssr_output; //ssr_output;
+    return ssr_output; //ssr_output;
 }
 
 
 // Calculate new PID values
 int16_t pid_update(void)
 {
-	therm_status_t* status = runtime_status();
-	therm_settings_t* set = flash_getsettings();
+    therm_status_t* status = runtime_status();
+    therm_settings_t* set = flash_getsettings();
 
-	// Convert temperature to fixed point number with 1/10th resolution
-	float temp = status->temp;
+    // Convert temperature to fixed point number with 1/10th resolution
+    float temp = status->temp;
 
-	// Calculate instantaneous error
-	// EMZ FIXME: was regulating to 1 degree below the setpoint! +1 accomadates for this
-	int16_t error = (status->setpoint+1) - temp;
+    // Calculate instantaneous error
+    // EMZ FIXME: was regulating to 1 degree below the setpoint! +1 accomadates for this
+    int16_t error = (status->setpoint+1) - temp;
 
-	// Proportional component
-	int32_t p_term = set->val.k_p * error;
+    // Proportional component
+    int32_t p_term = set->val.k_p * error;
 
-	// Error accumulator (integrator)
-	state.i_state += error;
+    // Error accumulator (integrator)
+    state.i_state += error;
 
-	// to prevent the iTerm getting huge from lots of
-	//  error, we use a "windup guard"
-	// (this happens when the machine is first turned on and
-	// it cant help be cold despite its best efforts)
-	// not necessary, but this makes windup guard values
-	// relative to the current iGain
-	int32_t windup_guard_res = (set->val.windup_guard * 10) / set->val.k_i;
+    // to prevent the iTerm getting huge from lots of
+    //  error, we use a "windup guard"
+    // (this happens when the machine is first turned on and
+    // it cant help be cold despite its best efforts)
+    // not necessary, but this makes windup guard values
+    // relative to the current iGain
+    int32_t windup_guard_res = (set->val.windup_guard * 10) / set->val.k_i;
 
-	// Calculate integral term with windup guard
-	if (state.i_state > windup_guard_res)
-	  state.i_state = windup_guard_res;
-	else if (state.i_state < -windup_guard_res)
-	  state.i_state = -windup_guard_res;
+    // Calculate integral term with windup guard
+    if (state.i_state > windup_guard_res)
+        state.i_state = windup_guard_res;
+    else if (state.i_state < -windup_guard_res)
+        state.i_state = -windup_guard_res;
 
-	// Discard I if we've achieved the setpoint (TODO: add setting disable/enable)
-	if(error <= 0)
-		state.i_state = 0;
+    // Discard I if we've achieved the setpoint (TODO: add setting disable/enable)
+    if(error <= 0)
+        state.i_state = 0;
 
-	int32_t i_term = set->val.k_i * state.i_state;
+    int32_t i_term = set->val.k_i * state.i_state;
 
-	// Calculate differential term (slope since last iteration)
-	int32_t d_term = (set->val.k_d * (temp - state.last_pid_temp));
+    // Calculate differential term (slope since last iteration)
+    int32_t d_term = (set->val.k_d * (temp - state.last_pid_temp));
 
-	// Save temperature for next iteration
-	state.last_pid_temp = temp;
+    // Save temperature for next iteration
+    state.last_pid_temp = temp;
 
-	int16_t result = (p_term + i_term - d_term) / 10;
+    int16_t result = (p_term + i_term - d_term) / 10;
 
-	// Put out tenths of percent, 0-1000.
-	if(result > 1000)
-	result = 1000;
-	else if(result < -1000)
-	result = -1000;
+    // Put out tenths of percent, 0-1000.
+    if(result > 1000)
+        result = 1000;
+    else if(result < -1000)
+        result = -1000;
 
-	// Return feedback
-	return result;
+    // Return feedback
+    return result;
 }