Power:
USB Charger--- 5V ----->USB Cable------->5V-----> Vin Anbest 3.3V Regulator---Vout------>3.3V Bus
Note: A 6v Battery can be used for a short time, but system draws a fair amount of current
BME 280:
GND-----> GND Bus
Vcc------->3.3V Bus
SCL------->SCL on Dragontail
SDA------>SDA on Dragontail
ESP 8244-ESP 01 Breakout:
Vcc------>3.3V Bus
GND----->GND Bus
TX0------> Pin 1 on Dragontail
RxD------>Pin 0 on nDragontail
CHPD(EN)----->3.3V Bus