diff --git a/config.h b/config.h
--- a/config.h
+++ b/config.h
@@ -3,6 +3,7 @@
 
 #define VCP_TX_FREQ 1000
 #define SSR_PERIOD 200
+#define PID_PERIOD 200
 
 #define LED_POWER GPIOF,GPIO_PIN_0