#+TITLE: MicroPython Implementation Notes


* Circuit Layout

| Pin | Used For      |
|  37 | SDA - MPU6050 |
|  36 | SCL - MPU6050 |
|     |               |


* SSD 1306

#+BEGIN_SRC python
from machine import I2C, Pin
import ssd1306

rst = Pin(16, Pin.OUT)
rst.value(1)
scl = Pin(15, Pin.OUT, Pin.PULL_UP)
sda = Pin(4, Pin.OUT, Pin.PULL_UP)
i2c = I2C(scl=scl, sda=sda, freq=450000)
oled = ssd1306.SSD1306_I2C(128, 64, i2c, addr=0x3c)

oled.fill(0)
oled.text('ESP32', 45, 5)
oled.text('MicroPython', 20, 20)
oled.show() 
#+END_SRC

* MPU 6050 

#+BEGIN_SRC python
from machine import I2C, Pin
from mpu6050 import accel

scl=Pin(36, Pin.OUT)
sda=Pin(37, Pin.OUT)
i2c = I2C(scl=scl, sda=sda, freq=450000)
a = accel(i2c)
a.get_values()
#+END_SRC


* Connections

Pin 23 ESP -> SDA MPU
Pin 19 ESP -> SCL MPU

MPU AD0 -> - Rail
MPU GND -> - Rail
MPU Vcc -> + Rail

ESP GND -> - Rail
ESP VEXT -> +Rail

* Things to look at

 - Can we turn off the MPU with VEXT Control? (ESP Pin 21).
 - Connecting to WiFi - Client Mode
 - Connecting to WiFi - Direct Mode
 - BLE?
 - NTP?
 - How to store the data appropriately
 - How to retrieve data over WiFi
 - How to detect battery low