B4R Code Snippet Reading a FC-37 water sensor (2 pin black)

SubName: Reading a water sensor (2 pin black)
Description: You can use this simple code to read a 2 pin rain/droplet/water sensor detector.

When the sensor is completely dry (no water resistance) the logs will show the value 1023. With this particular sensor the more water there is on it the lower the value will go. I personally found that the value 750 is a good water warning trigger (that is basically 1 drop of water).

Spoiler: Water sensor readings

********************* PROGRAM STARTING ****************
AppStart
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1015
It's dry
1016
It's dry
1018
It's dry
1019
It's dry
1020
It's dry
1020
It's dry
778
It's dry
734
It's wet
720
It's wet
703
It's wet
706
It's wet
705
It's wet
703
It's wet
706
It's wet
707
It's wet
709
It's wet
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry
1023
It's dry

'WIRE LEGEND for black 2 pin water sensor
'GND = GND
'VCC = 5V
'A0 = A0

'*************************
'***        BOARD TYPE        ***
'***    Mega or Mega 2560  ***
'*************************

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'Public variables can be accessed from all modules.
    Public Serial1 As Serial
    Private Sensor_A0 As Pin
    Private TmrReadings As Timer
    Private sensortrigger As Int = 750
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    Sensor_A0.Initialize(0, Sensor_A0.AnalogRead)
    TmrReadings.Initialize("Readings_Tick", 1000)
    TmrReadings.Enabled = True
End Sub

Sub Readings_Tick
    Log(Sensor_A0.AnalogRead)
    If Sensor_A0.AnalogRead < sensortrigger Then Log("It's wet") Else Log("It's dry")
End Sub

Tags: Water, Sensor, Arduino, ESP

Actual sensor/module

 

[Beja]

Hello all
Today I am using Peter's code in my project, but I need to use two water sensors instead of one as explained above, I tried to modify Pete's code
but nor sure if it work.. (will test on Uno as soon as I get to there.)
Here's the modified code. please advice if there's anything wrong with this code. Thanx. B

'WIRE LEGEND for black 2 pin water sensor
'GND = GND
'VCC = 5V
'A0 = A0

'*************************
'***        BOARD TYPE        ***
'***    Mega or Mega 2560  ***
'*************************

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'Public variables can be accessed from all modules.
    Public Serial1 As Serial
    Private Sensor_A0 As Pin

‘=========================================

Private Sensor_A1 As Pin

‘=========================================
    Private TmrReadings As Timer
    Private sensortrigger As Int = 750

‘=========================================

Private sensortrigger2 As Pin = 90

‘=========================================
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    Sensor_A0.Initialize(0, Sensor_A0.AnalogRead)
    TmrReadings.Initialize("Readings_Tick", 1000)
    TmrReadings.Enabled = True
End Sub

Sub Readings_Tick
    Log(Sensor_A0.AnalogRead)
    If Sensor_A0.AnalogRead < sensortrigger Then Log("It's wet") Else Log("It's dry")

‘=========================================

    Log(Sensor_A1.AnalogRead)
    If Sensor_A1.AnalogRead > sensortrigger2Then Log("It's dry") Else Log("It's wet")

 ‘=========================================
End Sub