Prototype

mermaid.js code:

graph TD
  battery[9V Battery] --> curr
  curr[INA219 <br> Current Sensor] --> esp[ESP8266]
  baro[BMP280 <br> Barometer] --> |I2C| esp
  imu[MPU6050 <br> IMU] --> |I2C| esp

  esp --> |I2C| pwm[PCA9685 <br> PWM Driver]
  pwm --> led1[LED]
  pwm --> led2[LED]
  pwm --> led3[LED]
  pwm --> led4[LED]

  button1[Button] --> esp
  button2[Button] --> esp
  button3[Button] --> esp
  
  esp --> |I2C| oled[0.96 Inch OLED]

Mermaid.js Live Editor: https://mermaid-js.github.io/mermaid-live-editor/