電容式土壤濕度感測器(Capacitive Soil Moisture Sensor)

感測器簡介

電容式土壤濕度感測器由於電極裸露易被腐蝕，會縮短感測器的工作壽命。電容式土壤濕度感測器系採用電容感應原理來檢測土壤濕度。

電路圖

Pycode程式列表

Blockly

Python

"""

EPY Sensor

-----------------

3V3 VCC

GND GND

AIN0 AO

"""

from machine import Pin,ADC

from machine import Switch

import utime

from machine import RTC

AirValue = None

WaterValue = None

intervals = None

soilMoistureValue = None

adc0 = None

KeyA = None

rtc = None

adc0 = ADC(Pin.board.AIN0)

KeyA = Switch('keya')

rtc = RTC()

AirValue = 3500

WaterValue = 2100

intervals = (AirValue - WaterValue) / 3

while True:

soilMoistureValue = adc0.read()

print('Moisture Sensor Value:' + str(soilMoistureValue))

if soilMoistureValue > WaterValue and soilMoistureValue < WaterValue + intervals:

print('Moisture Wet')

elif soilMoistureValue > WaterValue + intervals and soilMoistureValue < AirValue - intervals:

print('Moisture Moist')

elif soilMoistureValue < AirValue and soilMoistureValue < AirValue + intervals:

print('Moisture Dry')

if (KeyA.value()) == True:

break

utime.sleep_ms( 400 )

執行結果

參考文獻

Capacitive Soil Moisture Sensor Calibration with Arduino

https://makersportal.com/blog/2020/5/26/capacitive-soil-moisture-calibration-with-arduino

Capacitive_Soil_Moisture_Sensor_SKU_SEN0193-DFRobot https://wiki.dfrobot.com/Capacitive_Soil_Moisture_Sensor_SKU_SEN0193