B4R Library rSHT20

B4R Library rSHT20

Purpose
rSHT20 is an open source library to read the temperature (°C) & humidity (%RH) from an SHT20 sensor.

The SHT20 Humidity and Temperature Sensor is a sensor that accurately measures humidity and temperature, used where precise environmental monitoring and control is required.

This B4R library is

• written in C++ (using the Arduino IDE 2.3.4 and the B4Rh2xml tool).
• tested with an ESP-Wroom-32 and a SHT20 sensor from ELV PAD4.
• tested with B4R 4.00 (64 bit), ESP32 library 3.2.0.

Files
rSHT20-NNN.zip archive contains the library and sample project.

Install
From the zip archive, copy the content of the library folder, to the B4R additional libraries folder keeping the folder structure.

Functions
See basic example below.

Wiring

SHT20 = ESP32 - wire
VCC = 3V3 - red
SDA = GPIO21 - blue
SCL = GPIO22 - green
GND = GND - black

I2C Address = 0x40 (hard-coded in the header SHT20.h).

B4R Basic Example

Sub Process_Globals
    ' Communication
    Public Serial1 As Serial
    ' SHT20
    Private sht As SHT20
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log(CRLF, "[AppStart]")
    'Init the module
    Dim result As Boolean = sht.Initialize()
    If Not(result) Then
        Log("[AppStart][ERROR] Can not init the SHT20. Check the wiring.")
    Else
        Dim result As Boolean = sht.Measure
        Log("[Measure] result=",result)
        Log("[Measure] t=",sht.Temperature,"h=",sht.Humidity,",d=",sht.Dewpoint(sht.Temperature,sht.Humidity))
    End If
End Sub

Log Output Example

[AppStart]rSHT20 BasicExample v20250626
[Measure] result=1
[Measure] t=22.2196h=67.4444,d=15.9005

License
MIT License

Setup
ESP32 with SHT20 Module.