SHT40 Humidity & Temperature Sensor | I2C Probe | Stainless Steel

This SHT40 temperature and humidity sensor gives you accurate environmental data for your projects. It's a digital sensor, so it replaces separate components like a pt100 sensor. It measures both temperature and humidity using an I2C connection. The sensor is housed in an SHT40 probe with a stainless steel case. Features and Benefits - Accurate readings - It typically reads relative humidity within ±1.8% and temperature within ±0.2°C. This is better than the older SHT3x series. - Stainless steel case - The SHT40 probe's stainless steel housing keeps the electronics safe from dust and moisture. - Easy I2C connection - You can connect it to a microcontroller, like an Arduino or Raspberry Pi, with just two wires for data. - Broad operating conditions - It works well in many different environments, from -40°C to 125°C and 0 to 100% relative humidity. Applications - Use this SHT40 sensor in a greenhouse to watch and control the climate. This helps plants grow better. - Put this SHT40 sensor into smart home systems. It can monitor rooms, basements, or cellars. - Build your own weather stations or data loggers. It's good for projects that need steady, correct environmental tracking. Safety & Preparation When working with temperature and humidity sensor probes, always ensure the power supply to any connected equipment is disconnected before installation or testing. This PT100 sensor module features a stainless steel housing, offering robust protection. Handle the I2C interface carefully to avoid damaging the pins. Ensure your working environment is clean and dry to prevent contamination of the precision sensor. Proper preparation prevents electrical hazards and ensures accurate readings from the SHT40 sensor. Identify standard RTD Values An RTD sensor, or Resistance Temperature Detector, measures temperature by correlating resistance with temperature. The PT100 sensor module is a specific type of RTD. "PT" indicates it's made from platinum, and "100" signifies that it has a resistance of 100 ohms at 0°C. This is a fundamental characteristic for calibrating or checking the sensor. Understanding this standard value is crucial for anyone checking an RTD sensor or connecting it to a controller. How to Test by Wire Configuration To check an RTD sensor like this PT100 module, you will typically use a multimeter to measure resistance. The method varies depending on the number of wires the RTD uses. This temperature and humidity sensor probe, with its I2C interface, is designed for digital communication. However, understanding the basic wire configurations for RTDs is essential for general troubleshooting and for integrating with various controllers. A. 2-Wire RTD A 2-wire RTD is the simplest configuration. To check an RTD sensor with two wires, connect the multimeter leads to each wire. The reading will include both the RTD’s resistance and the resistance of the lead wires. This can introduce inaccuracies, especially with long wires. For the PT100 sensor module, if you were to encounter a 2-wire setup, you would measure the resistance directly across the two terminals. B. 3-Wire RTD (Most Common) The 3-wire RTD is the most common configuration and is designed to compensate for lead wire resistance. It has two wires of the same colour connected to one side of the platinum element, and one wire of a different colour connected to the other. To check an RTD sensor in this configuration, measure the resistance between the two like-coloured wires; this should be close to zero. Then, measure between one of the like-coloured wires and the third wire to get the RTD’s resistance. This method improves accuracy for this type of precision sensor.