MakePython

A simple Environmental  reporter：

with few MicroPython programs, Any terminal in the wifi can access the reporter easily:

The MakePython ESP32 version sample completed, i designed it WROOM/WORVER compatible, while WROOM with NO PSRAM  and WROVER 8MB PSRAM

Compares to the ESP8266 version, the ESP32 version much more powerful, which makes it much competent for MicroPython.. all the pins are breakout with clean function explanation..  

In the learning of MicroPython,  i write some experence& projects,  about the basic usage of microPython, and especially the WIFI projects... maybe helpful for some new learners ... will open it soon..

i am making the MakePython ESP32, with WROOM or WROVER. indeed the ESP8266 is a little difficult to run the MicroPython, especially when it comes to  a real project but not just for learning... the ESP32 version  much stronger..

A simple& cheap Pulse Sensor is a photoelectric reflex analog sensor for pulse and heart rate measurement. Wear it on finger, earlobe and so on, make use of the body tissue in the vascular pulse caused by different transmittance to measure pulse. Then the heart rate value can be obtained by simple calculation.

On the left is the s-pin of the signal output, in the middle is the positive power supply VCC (3.3v ~5V), and on the right is the negative power supply GND.

The special pin for ADC collection is IO0.The input voltage is 0V~ 1.0v and the measured value is 0~1024, The s-pin is connected to IO0, the middle pin is connected to 3V3, and the "-" pin is connected to GND:

the MicroPython codes:

#from machine import Pin,I2C,RTC
import machine
from micropython import const
import time
import ssd1306
import math

WIDTH = const(128)	#Set the screen width
HEIGHT = const(64)		#Set the screen high
pscl = machine.Pin(5, machine.Pin.OUT)
psda = machine.Pin(4, machine.Pin.OUT)
i2c = machine.I2C(scl=pscl, sda=psda)
oled = ssd1306.SSD1306_I2C(WIDTH, HEIGHT, i2c)

counttime=0

while True:
adc = machine.ADC(0)			#Create an ADC object on an ADC pin
  adcValue=adc.read()			#ADC data acquisition
  oled.line(counttime,40,counttime,adcValue//16,1)   #Drew the heart rate
  oled.show()
  time.sleep_ms(1)
  counttime+=1

  if(counttime>127):
    counttime=0
    oled.fill(0)      #Clear the screen
    oled.show()

Makepython is  truly Compatible with Breadboard , and easy to prototype..

Some simple demos with Micropython:

1.  Analog potentionmeter:

2. Heart beat monitor:

3. Servo control:

4. WS2812 cascading：

The PCB design completed, and it got to our office yesterday night, and i assembled it with 2 hours.

1. The 1.3'' OLED starts Ok now.  

2. The 2 row pins cross 2 breadboards, but it seems the pins positon need to be adjust a little to make right for 2 breadboards. 

3. The silkscrren need to be updated to make it more clear for readers. 

4. Round corners. 

5. Too big slots for the OLED flex cable.

Will be the 2rd version soon as i get more drawbacks.  

Actually the ESP8266 pins that can be used by end users is not so much. There the SPI/I2C/UART, and few pins could be used.  The IO0 can be also used as a normaly IO port, the MCU detect IO0 state to enter the programming/working state. there some projects needs another software UART to communicating with other module such as a GPS module (the default one need to connect the PC for debugging info), as there on-board OLED,  this situation could be easier...

Schematic Released with eagle...