9V Original HW High-Quality Battery Node MCU ESP8266 V3 (LOLIN CH340 chip) while 12V output should read

while 12V output should read 11

with the blue side facing away from the board

Ai Thinker ESP-12S ESP8266 Serial WiFi Module

Use your aircraft's own ESC/BEC for that

and I2C interfaces

9V Original HW High-Quality Battery Node MCU ESP8266 V3 (LOLIN CH340 chip) while 12V output should read9V Original HW High Quality Battery Reliable 9 volt power for your electronics projects, prototypes, and everyday devices. This original HW high quality battery delivers consistent voltage output and long lasting performance, making it ideal for Arduino projects, multimeters, smoke detectors, and a wide range of electronic applications. Available at The Engineer Store, Bengaluru with fast shipping and dedicated support. Specifications Voltage 9V (DC)