SHT40 I2C Humidity and Temperature Sensor Probe (Plastic) -7Semi

📊 Overview
Sensor Type: Digital humidity and temperature probe using the SHT40 CMOSens sensor.
Probe Material: Durable plastic + metal housing, suitable for general environmental monitoring.
Interface: I²C digital communication — easy to interface with microcontrollers like Arduino, ESP32, Raspberry Pi, STM32, etc.
Operating Voltage: Typically 3.3 V (some versions support up to ~5.5 V depending on wiring and board design).
🔍 Key Features
✔ Accurate Measurements:
• Temperature range: –40 °C to +125 °C with high precision.
• Relative humidity range: 0 % to 100 % RH, fully digital output.
✔ Fast Response & Low Power:
• Digital I²C interface outputs high‑resolution readings (typically 16‑bit).
• Very low power consumption (excellent for battery‑powered systems).
✔ Integrated Circuit Level Features:
• Usually factory calibrated and compensated (no need for external corrections).
• Supports multiple predefined I²C device addresses for systems with more sensors.
✔ Built‑In Components:
• Some modules include pull‑up resistors and filter capacitors built in, simplifying wiring.
• Some variants also include an internal heater, configurable to help prevent condensation in damp conditions.
🧠 How It Works
The internal SHT40 sensor measures temperature and relative humidity simultaneously.
Communication is over the I²C bus (standard digital protocol) — one data line (SDA), one clock line (SCL), plus power (VCC) and ground (GND).
Typical wiring:
• Red: VCC (Power)
• Black: GND (Ground)
• Yellow: SDA (Data)
• Green: SCL (Clock)
🧪 Typical Specifications
Temperature Range: –40 °C to +125 °C
Humidity Range: 0 % to 100 % RH
Typical Humidity Accuracy: ~±1.8 % RH
Typical Temperature Accuracy: ~±0.2 °C
I²C Default Address: 0x44 (typical for SHT40 devices)
Power Consumption: Ultra‑low, ideal for energy‑sensitive applications.
📌 Applications
This SHT40 probe is widely used in systems that require reliable and precise humidity/temperature measurements:
Environmental monitoring (indoor/outdoor climate tracking).
HVAC systems (heating, ventilation, and air conditioning).
Agriculture and greenhouse sensing.
IoT sensor networks and smart home controllers.
Industrial automation and process control.
Weather stations and data logging systems.
⚠️ Tips & Notes
⚠ Digital Sensor: Being digital, it delivers exact humidity and temperature values — not analog voltages — so you read them directly via I²C.
⚠ Pull‑Ups Required: Some boards include pull‑up resistors, but if your module doesn’t, you’ll need external pull‑ups on SDA/SCL for stable I²C communication.
⚠ Probe Protection: The plastic‑enclosed probe is moisture‑resistant, but keep the electronics (especially the microcontroller) protected from water exposure.