diff --git a/3d/Surprising Inari-Allis-2.stl b/3d/Surprising Inari-Allis-2.stl
new file mode 100644
index 0000000..bfb7311
Binary files /dev/null and b/3d/Surprising Inari-Allis-2.stl differ
diff --git a/3d/Surprising Inari-Allis-3.stl b/3d/Surprising Inari-Allis-3.stl
new file mode 100644
index 0000000..fbfe59a
Binary files /dev/null and b/3d/Surprising Inari-Allis-3.stl differ
diff --git a/3d/Surprising Inari-Allis-4.stl b/3d/Surprising Inari-Allis-4.stl
new file mode 100644
index 0000000..a7e0079
Binary files /dev/null and b/3d/Surprising Inari-Allis-4.stl differ
diff --git a/3d/Surprising Inari-Allis.stl b/3d/Surprising Inari-Allis.stl
new file mode 100644
index 0000000..2a84ec0
Binary files /dev/null and b/3d/Surprising Inari-Allis.stl differ
diff --git a/README.md b/README.md
index 66beffb..404daba 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,30 @@
 # tank_cooler
 
-A tiny tank cooler.
-
-Used components:
-
-Arduino nano
-PC fan 120mm 5V
-PWM D4184 MOS breakout board
-USB-C connector
+A tiny tank cooler.
+
+Used components:
+----------------
+
+Arduino nano
+PC fan 120mm 5V
+PWM D4184 MOS breakout board
+USB-C connector
+
+Connections:
+------------
+
+USB-C D+ <-> Pin4 CH430 chip
+USB-C D- <-> Pin5 CH430 chip
+
+VIN      <-> PWM board (+)
+VIN      <-> USB-C V+
+
+GND      <-> USB-C GND
+GND      <-> BMP280 breakout board GND
+GND      <-> PWM breakout board GND
+
+D9       <-> PWM Pin of the breakout board
+
+A4       <-> SCL pin of BMP280 breakout board
+A5       <-> SDA pin of BMP280 breakout board
+
diff --git a/firmware/firmware.ino b/firmware/firmware.ino
index f6039f4..5f2eb2b 100644
--- a/firmware/firmware.ino
+++ b/firmware/firmware.ino
@@ -7,7 +7,7 @@
 // minimum value to start both fan's is 110
 // without queeking noise is 255
 #define FAN_ON_TEMP      26.0
-#define FAN_OFF_MAX_TEMP 24.5
+#define FAN_OFF_MAX_TEMP 25.0
 
 #define FAN_ON_STATE  HIGH
 #define FAN_OFF_STATE  LOW
@@ -19,15 +19,8 @@ uint32_t bmp280_lastcheck_millis = BMP280_CHECK_INTERVAL_MS;
 
 uint8_t fan_state = LOW;
 
-#line 22 "/Users/klaute/Documents/dev/tank_cooler/firmware/firmware.ino"
-void setup();
-#line 41 "/Users/klaute/Documents/dev/tank_cooler/firmware/firmware.ino"
-void loop();
-#line 10 "/Users/klaute/Documents/dev/tank_cooler/firmware/sensor_bmp280.ino"
-bool sensor_bmp280_begin(uint8_t addr);
-#line 34 "/Users/klaute/Documents/dev/tank_cooler/firmware/sensor_bmp280.ino"
 float sensor_bmp280_temperature();
-#line 22 "/Users/klaute/Documents/dev/tank_cooler/firmware/firmware.ino"
+
 void setup()
 {
   // put your setup code here, to run once: