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DescriptionThe MAX31820 ambient temperature sensor provides 9-bit to 12-bit Celsius temperature measurements with ±0.5℃ accuracy over a +10℃ to +45℃ temperature range. Over its entire -55℃ to +125℃ operating range， the device has ±2.0℃ accuracy.The device communicates over a one-wire bus that， by definition， requires only one data line(and ground)for communication with a central microprocessor. In addition， the device can derive power directly from the data line， eliminating the need for an external power supply. Requiring so few pins enables the device to be placed in a 3-pin TO-92 package. The form factor of this package allows the device to be placed above the board and thus measure the ambient temperature of a system， as opposed to the board temperature that a surface-mount package would measure.Each MAX31820 has a unique 64-bit serial code， which allows multiple MAX31820 devices to function on the same one-wire bus. Therefore， it is simple to use one microprocessor to control many devices distributed over a large area.FeaturesUnique one-wire interface requires only one port pin for communicationEach device has a unique 64-bit serial code stored in onboard ROMMultidrop capability simplifies distributed temperature-sensing applicationsRequires no external componentsCan be powered from data line； 3.0V to 3.7V power-supply rangeMeasures temperatures from -55℃ to +125℃±0.5℃ accuracy from +10℃ to +45℃Thermometer resolution is user-selectable from 9 bits to 12 bitsConverts temperature to 12-bit digital word in 750ms(Max)User-definable nonvolatile(NV)alarm settingsAlarm search command identifies and addresses devices whose temperature is outside programmed limits(Temperature Alarm Condition)Available in 3-pin TO-92 packageTO-92 package allows measurement of ambient temperatureSoftware compatible with the DS1822 and DS18B20

DescriptionPassive Infrared(PIR)sensors are great for detecting motion in a small area around the sensor. The 170μA SparkFun EKMC4607112K PIR Breakout is a simple board equipped with an EKM-series PIR sensor from Panasonic(R). The EKM-series PIR sensors are optimized for small movements to offer motion-sensing options for continuously powered applications.PIR sensors do not return specific distance data but instead monitor for IR light coming from objects in their field of view and will activate their signal when motion is detected in their sensing area， making them perfect for applications such as turning devices on automatically when motion is detected. Applications include home and building automation for energy saving， automated on/off lighting control， security， appliances， and IoT.Panasonic's low-profile PIR motion sensors(10.9mm versus standard 14.4mm height offer space savings for constrained designs)consist of a lens to create various detection zones， an optical filter to block non-infrared light， pyroelectric sensing elements， electromagnetic shielding to all circuitry， and an impedance converter to get an electrical signal. This PIR sensor offers digital output across 32 zones at 5m detection distance with 90°×90° detection area.Note：The sensitivity of passive infrared sensors is influenced by environmental conditions， so a performance evaluation test under representative conditions is recommended.Get Started with the SparkFun PIR Breakout GuideFeaturesOperating Voltage：2.3-4.0V170 μAstandby current consumptionLens diameter - 10.4mmLens Height - 10.9mm5m detection distance90°×90°(±45°)detection area