The DHT21/AM2301 is a high-precision capacitive digital temperature and humidity sensor operating at 3.3V–5.5V. It offers a wide temperature range of -40°C to 80°C and 0–100% RH with ±0.5°C and ±3% RH accuracy. Ideal for Arduino, IoT, weather monitoring, and smart home automation projects.
The DHT22 is a high-precision digital temperature and humidity sensor module ideal for Arduino, Raspberry Pi, ESP8266, IoT systems, smart homes, and weather stations. With stable output, wide range, and digital signal interface, it’s perfect for climate monitoring, automation, and data logging projects.
The DHT22 Temperature & Humidity Sensor is a high-precision digital sensor ideal for Arduino, Raspberry Pi, IoT, HVAC, and weather monitoring systems. It offers accurate temperature and humidity readings, making it perfect for environmental monitoring and smart home automation.
DS18B20 Temperature Sensor Module is a digital temperature sensor, and you can easily connect it to Arduino with only one 4.7-pound resistor, base 1 – Ground 2 – Output – Base 3 to the positive of the source, with resistance to base 2 Is connected. The connection of this sensor to the Arduino via the 1-wire protocol is established. Therefore, several sensors can be connected only through one common wire to Arduino. The output is digitally accurate to 12 bits. Therefore, the temperature can be measured with a precision of 0.0625 º C.
The DS18B20 Waterproof Temperature Sensor is a high-precision digital sensor with a stainless steel probe. Ideal for Arduino, Raspberry Pi, HVAC, industrial automation, and temperature monitoring, it provides accurate, real-time temperature readings in liquids, soil, and harsh environments.
Original LM35 Temperature Sensor is an integrated analogue temperature sensor whose electrical output is proportional to Degree Centigrade. LM35 Temperature Sensor does not require any external calibration or trimming to provide typical accuracies. The LM35’s low output impedance, a linear output, and precise inherent calibration make interfacing to readout or control circuitry especially easy.
The main advantage of LM35 is that it is linear i.e. 10mv/°C which means for every degree rise in temperature the output of LM35 will rise by 10mv. So if the output of LM35 is 220mv/0.22V the temperature will be 22°C. So if the room temperature is 32°C then the output of LM35 will be 320mv i.e. 0.32V.
As such no extra components required to interface LM35 to ADC as the output of LM35 is linear with 10mv/degree scale. It can be directly interfaced to any 10 or 12 bit ADC. But if you are using an 8-bit ADC like ADC0808 or ADC0804 an amplifier section will be needed if you require to measure 1°C change.
LM35 can also be directly connected to Arduino. The output of LM35 temperature can also be given to comparator circuit and can be used for over-temperature indication or by using a simple relay can be used as a temperature controller.
The MAX31865 Platinum Resistance Temperature Sensor Module is a high-precision RTD-to-digital converter for PT100 and PT1000 sensors. It ensures accurate temperature measurement, low noise performance, and fast response time. With an SPI interface, it easily integrates with Arduino, Raspberry Pi, ESP32, and IoT projects. Ideal for industrial automation, HVAC systems, thermal monitoring, and smart temperature control, the MAX31865 sensor delivers stable, real-time data for high-efficiency applications. The MAX31865 input has over voltage protection of up to ± 45V, providing configurable RTD and open cable, short circuit condition detection.