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This DS18B20 Temperature Sensor Module For Arduino, a Digital temperature sensor DS18B20 will tell you, with 9 to 12-bit resolution! Uses only 1 wire to the Arduino or other micro-controller for communication. With the One Wire protocol, you can operate a large number of these sensors from one Arduino pin.

This is the latest DS18B20 1-Wire digital temperature sensor from Maxim IC. Reports °C with 9 to 12-bit precision, -55°C to 125°C (+/-0.5°C). Each sensor has a unique 64-Bit Serial number etched into it allows for a huge number of sensors to be used on one data bus.

This is a wonderful part that is the cornerstone of many data-logging and temperature control projects.

Features:

• Unique 1-Wire interface requires only one port pin for communication
• Each device has a unique 64-bit serial code stored in an onboard ROM
• Multidrop capability simplifies distributed temperature sensing applications
• Requires no external components
• Thermometer resolution is user-selectable from 9 to 12 bits
• Converts temperature to the 12-bit digital word in 750ms (max.)
• User-definable nonvolatile (NV) alarm settings
• Alarm search command identifies and addresses devices whose temperature is outside of programmed limits (temperature alarm condition)
• Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermally sensitive system

If you are wandering to build a device that detects temperature and humidity from the atmosphere, then This sensor is needed for you. 

The DHT22 Digital Temperature and Humidity Sensor Module AM2302 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air and spits out a digital signal on the data pin (no analog input pins needed).

Features:

• High precision
• Capacitive type
• Full range temperature compensated
• Relative humidity and temperature measurement
• Calibrated digital signal
• Outstanding long-term stability
• Extra components not needed
• Long transmission distance
• Low power consumption
• 4 pins packaged and fully interchangeable

Details:

• Low cost, 2.5mA max current use during conversion (while requesting data)
• 3 to 5V power and I/O, Body size 15.5mm x 12mm x 5.5mm
• Good for 20-80% humidity readings with 5% accuracy
• Good for 0-50°C temperature readings ±2°C accuracy
• No more than 1 Hz sampling rate (once every second), 4 pins with Approximate 0.1" spacing

Details:

• High precision non-contact temperaturemeasurements
• Thermal Comfort sensor for Mobile AirConditioning control system
• Temperature sensing element for residential, commercial and industrial building airconditioning Windshield defogging
• High energy efficiency, low power consumption, energy conservation and durability
• Can be used for electronic enthusiasts DIY production, maintenance.