Quantity   Component name
1 × ESP8266 (ESP-12E) WiFi Microcontroler module
1 × SSD1306 OLED Display I2C 128x64px OLED display
1 × DS1621 temperature sensor DS1621 I2C temperature sensor
4 × Pushbutton
1 × LM1117 3.3v Power Management ICs / Linear Voltage Regulators and LDOs
1 × 18650 Li-Ion cell 18650 3.7V Li-Ion cell from dead laptop battery