diff --git a/README.md b/README.md
index b84dae1..c375395 100644
--- a/README.md
+++ b/README.md
@@ -3,20 +3,8 @@ A Raspberry Pi-compatible PCB that extends the GPIO header with protected I/O, r
 
 **Notes:**  
 
-# Name
-- Pi-multipurpose-Adapter
-- Pi-multi-function-adapter
-- Pi-extension-board
-
-- universal-Pi-interface-board
-- pi-peripheral-interface
-- raspberry-extension-board
-- Pi-protected-connection-hub
-
-
-
 # RPI Specs (Zero, 3+)
-- Available (old) Pi: Raspberry Pi 2 Modell B v1.1 
+- Available (old) Pi: Raspberry Pi 2 Model B v1.1 
 - GPIO
   - Low: 0.9V
   - High: 1.6V
@@ -24,25 +12,31 @@ A Raspberry Pi-compatible PCB that extends the GPIO header with protected I/O, r
   - Input capacitance: 5pF
   - Output Current +-17mA
   - Pullup / Pulldown 50-65k
-
 - EEPROM GPIO0 GPIO1, leave unused
 
 
 
 # Feature Ideas
+- [x] Temperature control
+  - fan
+    - auto turn on
+      - temp sensor
+    - ~~turn on via gpio~~
+
+
 ## Supply
 - Input protection
-  - TVS
-  - reverse polarity
-  - Fuse
-  - buffer
-- Pass through power supply
-- 3.3V, 5V, 12V, 24V Regulator
+  - [x] TVS
+  - [x] reverse polarity (polyfuse will trigger)
+  - [x] Fuse (5A polyfuse)
+  - [x] buffer
+- [x] Pass through power supply
+- [x] 3.3V, 5V, 12V, 24V Regulator
 
-- power by barrel connector (24V 3A)
-- power by usb
-  - Switch between power by USB or power supply?
-- power by battery
+- [x] power by barrel connector (24V 5A)
+- ~~power by usb~~ [not allowed]
+  - ~~Switch between power by USB or power supply?~~
+- ~~power by battery~~ [dropped]
   - liion cell connector
   - BMS / charge controller
   - measure battery voltage
@@ -52,62 +46,62 @@ A Raspberry Pi-compatible PCB that extends the GPIO header with protected I/O, r
 ## IO
 - Input
   - GPIO
-    - voltage protection
-        - 330R, Z
-    - wide voltage range 1.6-24V
-    - Low pass filter
-    - Optocoupler input
-  - ADC
+  - [x] wide voltage range (-1.7 to 120V)
+  - [x] TVS
+  - [x] reverse polarity (-1.73V max)
+  - [x] Low pass filter
+  - [x] Optocoupler input
+  - [x] ADC
     - external IC
-    - multiplexer?
+    - ~~multiplexer?~~
     - protection
     - scale input voltage
-      - fixed inputs: 24V 12V 5V 3.3V ?
-      - trim potentiometer?
+      - fixed inputs: 24V 12V 5V 3.3V
+      - 20mA input
+      - ~~trim potentiometer?~~
 - Output
-  - Relay
-  - Mosfet
-  - Optocoupler output
-  - GPIO with over current protection
-  - GPIO level shift (24V output)
-  - PWM pins
-  - shift register
-  - DAC
+  - [x] Relay
+  - [x] Mosfet
+  - [x] Optocoupler output
+  - [ ] GPIO with over current protection
+  - [ ] GPIO level shift (24V output)
+  - [x] PWM pins
+  - [x] shift register
+  - [ ] DAC
 
-- LEDS indicate I/O state
-- Testpoints
-- ESD protection
+- [x] LEDS indicate I/O state
+- [ ] Testpoints
+- [x] ESD protection (tvs diodes uart, i2c...)
 
 
 ## Bus
-- UART/RS485
-- RS232 Connector
-- I2C Pullup
-- SPI
-- CAN
-- Serial to usb (if Arduino)
-- OWB default GPIO4
+- [x] UART/RS485
+- [ ] RS232 Connector
+- [x] I2C Pullup
+- [x] SPI
+- [ ] CAN
+- ~~Serial to usb (if Arduino)~~
+- ~~OWB default GPIO4~~
 
 
 ## UI
-- Input
+- Input [dropped]
   - Buttons
   - DIP switches?
   - Temperature sensor
   - Encoder
   - Potentiometer
 - Output
-  - Display
-  - Buzzer
-  - LEDS
+  - [ ] Display [RPI display pending]
+  - [x] Buzzer
+  - [x] LEDS
 
 
 ## Mechanical
-- Barrel plug (24V 3A supply)
-- Screw terminals / spring loaded?
-- pin header angled?
-- pin header for extension
-- pass through all pins?
+- [x] Barrel plug (24V 3A supply)
+- ~~Screw terminals~~
+- [x] spring loaded?
+- ~~pass through all pins?~~
 
 ## Housing
 - RPI ports
@@ -121,8 +115,8 @@ A Raspberry Pi-compatible PCB that extends the GPIO header with protected I/O, r
 - Extension board with multiplexer
 - Breadboard compatible?
 - SD Card
-- Onboard MCU for standalone use?
-- separate bought MCU via i2c  for additional GPIO, DAC, ADC in one
+- ~~Onboard MCU for standalone use?~~
+- ~~separate bought MCU via i2c  for additional GPIO, DAC, ADC in one~~
 
 
 ## Questions
diff --git a/cad/housing.FCStd b/cad/housing.FCStd
index 26ca833..8c3e3a2 100644
Binary files a/cad/housing.FCStd and b/cad/housing.FCStd differ