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digital output Gas Analog Smoke LPG CO Sensor MQ2 gas sensor with analog and digital output adjustable sensing range
Reverse voltage protection: Reverse voltage protection
netduino sample 
Tactile button tutorial
and works with the latest Arduino software
DFRobot URM07 UART Ultrasonic Sensor - 20-750cm, Low Power lcd keypad shield digital output Gas Analog SmokeAdd Reliable Ultrasonic URM07 UART Low Power Consumption Sensor 20~750cm Sensing to Your Next Build Ultrasonic URM07 UART Low Power Consumption Sensor 20~750cm Ultrasonic URM07 UART Low Power Consumption Sensor 20~750cm. An ultrasonic sensor measures distance by calculating the time difference between sending a signal and receiving an echo from an object. It uses echolocation to measure distances, just like a bat. The URM07 is an ultra low power
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