diff --git a/src/pwmout.c b/src/pwmout.c
--- a/src/pwmout.c
+++ b/src/pwmout.c
@@ -86,10 +86,19 @@ void pwmout_init(void)
 // functionality. this is a problem.
 
 // also duty cycling isn't working correctly...
-void pwmout_process(uint16_t duty)
+void pwmout_process(int16_t duty)
 {
+	if(duty == 0)
+	{
+		HAL_GPIO_WritePin(SSR, 0);
+		HAL_GPIO_WritePin(LED, 0);
+		// TODO: Disable timer
+	}
+	if(duty < 0)
+		duty = -duty;
 
-	htim17.Instance->CCR1 = duty;
+
+	htim17.Instance->CCR1 = duty; //duty;
 //	HAL_GPIO_TogglePin(SSR_GPIO_Port, SSR_PIN);
 
 //	uint32_t ssr_output = duty; // meh