diff --git a/fw/Core/Src/main.c b/fw/Core/Src/main.c
index 6b9956c..59b6367 100644
--- a/fw/Core/Src/main.c
+++ b/fw/Core/Src/main.c
@@ -152,7 +152,7 @@ int main(void)
     //float voltage_ch1 = (val_ch1 * 3.3f) / 4095.0f * adc_voltage_divider;
 
     // simple bang-bang regulation
-    const float target_voltage = 3.5f;
+    const float target_voltage = 4.5f;
     if (voltage_ch0 < target_voltage)
     {
       state = GPIO_PIN_SET;