diff --git a/firmware/cup.c b/firmware/cup.c
index dbba047..a19db2c 100644
--- a/firmware/cup.c
+++ b/firmware/cup.c
@@ -197,7 +197,18 @@ int main(void)
 				adc_sum = 0;
 				adc_pos = 0;
 				temperature = linearize_temp(temperature_adc);
-				heat_output = control_output(temperature, target);
+				if(dev_state)
+				{
+					heat_output = control_output(temperature, target);
+					heat_on[0] = 0;
+					heat_on[1] = 128;
+					heat_off[0] = heat_output;
+					heat_off[1] = heat_output + 128;
+				}
+				else
+				{
+					heat_on[0] = heat_on[1] = heat_off[0] = heat_off[1] = 0;
+				}
 			}
 		}