add more info

README.md

@@ -4,9 +4,18 @@
 
 ## Hardware
 
- - 1x or 2x: Adafruit NeoKey 1x4 https://www.adafruit.com/product/4980
- - Switches and Keycaps for NeoKey.
- - 1x Olimex ESP32-PoE-ISO
+ - 1x Adafruit NeoKey 1x4 https://www.adafruit.com/product/4980
+ - 4x Switches and Keycaps for NeoKey.
+ - 1x ESP8266 Wemos D1 Mini (Software supports also Olimex ESP32-PoE)
+ - optional: 1x Barrel connector and cable
+
+### Case
+ - 4x M2 5mm-10mm Screws
+ - 4x M3 5mm-15mm Flathead Screws
+
+### Wiring
+ - Solder Barrel Connector to GND and 5V of wemos d1 board
+ - Connect NeoKey - to GND, V to 5V, D to D2(SDA), C to D1(SCL)
 
 ## MQTT