7Semi_SHT4x_analog_Arduino_Library

A lightweight and minimal Arduino library for the Sensirion SHT40I-Analog temperature + humidity sensor family. Supports all analog-output variants (HD1B, ID1B, JD1B, KD1B, LD1B) and converts the sensor’s analog RH/T voltages into real-world %RH and °C / °F values.
Designed for low flash usage and compatible with AVR, ESP32, ESP8266, RP2040, STM32, and other Arduino platforms.

✨ Features

✔ Supports all SHT40I-Analog variants

• HD1B – standard linear output
• ID1B – industrial RH + table-based T
• JD1B – industrial RH + standard T
• KD1B – humidity-only
• LD1B – table-based RH + T

✔ Conversion Capabilities

• Analog RH output → %RH
• Analog T output → °C / °F

✔ Library Highlights

• Customizable ADC resolution (8/10/12/13/16-bit)
• Simple API:
  • readHumidity()
  • readTemperatureC()
  • readTemperatureF()
• Works with 3.3V or 5V sensors
• Extremely small footprint — ideal for embedded systems
• Pure analog — no I²C required

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⚡ Getting Started

1. Install via Arduino Library Manager

1. Open Arduino IDE
2. Navigate to:
   • IDE 1.x: Sketch > Include Library > Manage Libraries…
   • IDE 2.x: Library Manager sidebar
3. Search for: 7Semi SHT4x analog
5. Click Install

2. Include the library

#include <SHT4x_analog_7Semi.h>

🔌 Wiring (Analog)

SHT40I-Analog Pin	Arduino Pin
VDD	3.3V
GND	GND
AOUT-RH	A0 (or any analog)
AOUT-T	A1 (or any analog)

Note: Some variants such as KD1B do not provide a temperature output pin.