Published July 12, 2019

Hall Sensor and Temperature Sensor in ESP32

This is a simple project using M5Stick and MicroPython in order to obtain data from the Hall sensors and temperature embedded in the chip.

BeginnerProtip11,709

Things used in this project

Hardware components

M5Stack M5StickC ESP32-PICO Mini IoT Development Board

Software apps and online services

MicroPython

Story

Few people know, but in the ESP32 microcontroller there are a couple of sensors built into the chip, namely, a Hall sensor and a temperature sensor (you can tell the processor temperature).

I decided to use the wonderful M5Stick-C device, which has the ESP32 chip we need and an equally good MicroPython development environment in the M5 UIFlow v1.3.3 implementation, it is worth noting that access to the hall sensor in the ESP32 module. * Is only in M5Stick- C, but I did not find it in the M5Stack.

And so, the task is very simple, but at the same time it seemed to me amusing and, in my opinion, worthy of attention.

I note that for the script to work, you must have imported LCD, Timers modules, this is done in boot.py and in the firmware initialization procedure.

Well, as you can see, the temperature is displayed in degrees Celsius, and since the M5Stick-C has a very small battery, I control the voltage of the built-in battery using the AXP192 module, made by the guys from M5.

Everything is so simple but so fun!

#M5Stack

Hall.py

from esp32 import *
axp.setLDO2Vol(2.7)
lcd.font(lcd.FONT_Small, transparent=False, fixedwidth=False)
lcd.orient(lcd.LANDSCAPE_FLIP)

def cl():
    lcd.fillScreen(lcd.BLACK)
    lcd.line(0, 40, 160, 40, lcd.GREEN)
    lcd.line(0, 50, 160, 50, lcd.GREEN)
    lcd.line(0, 60, 160, 60, lcd.GREEN)
    temp = round((((raw_temperature() - 32) / 1.8)), 1)
    bat = round((axp.getBatVol() / 1000), 2)
    lcd.print('CPU:' + str(temp), lcd.RIGHT, 0)
    lcd.print('BAT:' + str(bat), lcd.RIGHT, 10)

cl()
x = 0
color = lcd.WHITE

while True:
    hall = hall_sensor()
    #lcd.print(str(hall_sensor()), lcd.CENTER, 0, lcd.WHITE)
    lcd.text(lcd.CENTER - 20, 0, "  " + str(hall) + "  ", lcd.WHITE)
    time.sleep_ms(50)
    #lcd.clear(lcd.RED)
    #x += 1 if x < 159 else x = 0
    if x < 159:
        x +=1
    else:
        x = 0
        cl()
    #lcd.pixel(x, 50 + hall, color)
    lcd.line(x, 50, x, 50 + hall, color)

Credits

X-doc

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Hall Sensor and Temperature Sensor in ESP32

Things used in this project

Hardware components

Software apps and online services

Story

Code

Hall.py

Credits

X-doc

Comments

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Hall Sensor and Temperature Sensor in ESP32

Hall Sensor and Temperature Sensor in ESP32

Things used in this project

Hardware components

Software apps and online services

Story

Code

Hall.py

Credits

X-doc

Comments

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