CD4021 is a cascadable 8bit parallel to serial shift register (basically the inverse of the 74hc595).
Sometimes you'll end up needing more digital input than the pins on your microcontroller board can readily handle. Using a parallel to serial shift register allows you collect information from 8 or more switches while only using 3 of the pins on your...
The Grove - Gas Sensor(MQ5) module is useful for gas leakage detecting(in home and industry). It can detect LPG, natural gas, town gas and so on. Based on its fast response time. measurements can be taken as soon as possible. Also the sensitivity can be adjusted by the potentiometer.
BeagleBone Black is the newest member of the BeagleBoard family and is a lower-cost, high-expansion focused BeagleBone, featuring the Sitara AM3359 ARM Cortex-A8 32-Bit RISC microprocessor from Texas Instruments. It is similar to the BeagleBone but with some previous features removed to make way for the excellent new features.
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