[Digi-Jet Follow me Issue 3] XIAO motherboard reads magnetic switch

eew_Ya3s2d

[Digi-Jet Follow me Issue 3] XIAO motherboard reads magnetic switch [Copy link]

 

Hello everyone, I am Zheng Gong. I bought a magnetic switch in the third issue of Follow me. This post will introduce how to read the magnetic switch with XIAO motherboard.

As the name suggests, a magnetic switch is a switch that can be opened and closed by a magnet. It can be used as a hidden switch in situations where users do not want to touch it.

The above is the magnetic switch of the GROVE interface. You can see that the connection is power/ground and there is also a signal (SIG) interface. It can be directly connected to the ADC interface on the XIAO baseboard.

The usage is also very simple, just need to initialize the interface corresponding to the AD port as a digital input port. The interface definition is as follows

The corresponding pin ports are:

So the initialization code is as follows

from machine import Pin

p2 = Pin(2, Pin.IN)

Then use p2.value() to read the value of the specific port.

My entire code is as follows. Since it is relatively simple, I will not upload it as an attachment.

from machine import Pin, SoftI2C
import ssd1306
import math
import time


p2 = Pin(2, Pin.IN)
i2c = SoftI2C(scl=Pin(7), sda=Pin(6))
oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)

oled.fill(0)
oled.text("pin2 off", 10, 15)
oled.fill_rect(40, 40, 20, 20, 1)
oled.show()  # Show the text
p2_status = False
while True:
    if p2.value() == True:
        if p2_status == False:
            p2_status = True
            oled.fill(0)
            oled.text("pin2 on", 10, 15)
            oled.fill_rect(40, 40, 20, 20, 1)
            oled.show()  # Show the text
    else:
        if p2_status == True:
            p2_status = False
            oled.fill(0)
            oled.text("pin2 off", 10, 15)
            oled.fill_rect(40, 40, 20, 20, 1)
            oled.show()  # Show the text

Jacktang

Mr. Zheng explained clearly how to read the magnetic switch on the XIAO motherboard

wangerxian

What is the approximate detection distance of this sensor?

eew_Ya3s2d

wangerxian posted on 2024-1-29 14:32 What is the approximate detection distance of this sensor?

It's only one or two centimeters, which may also be related to the magnetism of the magnet