Quantity   Component name
1 × ESP8266-01
1 × I2C Oled display Oleds with the SSD1306 or the SH1106 controller can both be used
1 × 3.3V powersupply I used this one: http://www.aliexpress.com/item/5PCS-Mini-3A-DC-DC-Converter-Step-Down-Module-Adjustable-3V-5V-16V-Power-for-RC/1852338074.html
2 × resistor 3k3 for pull_up of I2C lines One between GPIO0 & 3.3V and one between GPIO2 & 3.3V
1 × A tantalium capacitor of 4.7uF For stability a powerline decoupling capacitor.