diff --git a/config.hpp b/config.hpp
index e382796..1adb1ea 100644
--- a/config.hpp
+++ b/config.hpp
@@ -20,7 +20,7 @@ constexpr unsigned int SECOND = 1000;
 constexpr unsigned int MINUTE = SECOND * 60;
 constexpr unsigned int HOUR = MINUTE * 60;
 
-constexpr unsigned int MEASUREMENT_COUNT = 3;
+constexpr unsigned int MEASUREMENT_COUNT = 1;
 constexpr int MEASUREMENT_DELAY = 10;
 
 /// Pots will always be watered below this humidity
@@ -42,7 +42,7 @@ constexpr int WATER_TIME_MS = 3 * SECOND;
 constexpr int LOOP_DELAY_MS = 1 * SECOND; // TODO set higher once it is working
 
 /// minimum amount of time to wait between watering each pot, even when minimum wetness has been reached
-constexpr int MIN_WATERING_INTERVAL_MS = 1 * MINUTE;
+constexpr int MIN_WATERING_INTERVAL_MS = 1 * SECOND; // TODO set higher once it is working
 
 /// maximum amount of time to wait between watering each pot, as long as maximum wetness has not been reaached
 constexpr int MAX_WATERING_INTERVAL_MS = 24 * HOUR;
diff --git a/drop.ino b/drop.ino
index 50f38bf..6497b83 100644
--- a/drop.ino
+++ b/drop.ino
@@ -16,6 +16,17 @@ void setup() {
 
   pinMode(PUMP_LED_PIN, OUTPUT);
   pinMode(PUMP_PIN, OUTPUT);
+  pinMode(LED_BUILTIN, OUTPUT);
+
+  // link pots to their config
+  for (unsigned int i = 0; i < POT_COUNT; i++) {
+    Pot *pot = &pots[i];
+
+    pot->config = &POT_CONFIGS[i];
+
+    pinMode(pot->config->valve_pin, OUTPUT);
+    pinMode(pot->config->led_pin, OUTPUT);
+  }
 }
 
 void loop() {
@@ -33,11 +44,6 @@ void loop() {
 
 void per_pot(Pot &pot) {
   int percentage = get_humidity(pot.config->sensor);
-  if (percentage < 0) {
-    Serial.println(F("sensor not connected"));
-    return;
-  }
-
   Serial.print(percentage);
   Serial.println(F("%"));
 
@@ -57,6 +63,8 @@ void per_pot(Pot &pot) {
 }
 
 void water_pot(Pot &pot) {
+  digitalWrite(LED_BUILTIN, HIGH);
+
   digitalWrite(pot.config->led_pin, HIGH);
 
   set_valve(pot.config->valve_pin, HIGH);
@@ -69,6 +77,8 @@ void water_pot(Pot &pot) {
   set_valve(pot.config->valve_pin, LOW);
 
   digitalWrite(pot.config->led_pin, LOW);
+
+  digitalWrite(LED_BUILTIN, LOW);
 }
 
 /// get humidity sensor value as a percentage
@@ -81,7 +91,7 @@ int get_humidity(Sensor &sensor) {
     delay(MEASUREMENT_DELAY);
   }
 
-  sensorVal /= MEASUREMENT_COUNT;  
+  sensorVal /= MEASUREMENT_COUNT;
 
   // Sensor has a range of e.g. 236 to 520
   // We want to translate this to a scale or 0% to 100%