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The hardware is consists of an Arduino microcontroller (here an Arduino Uno R3) and a pre-wired soil moisture sensor module. The soil moisture sensor module , built around the LM393 comparator, gives ...
The security system comprises of an Arduino Uno microcontroller and a standard SIM900A based GSM/GPRS modem. ... The circuit is highly-flexible so that you can use any SIM900A modem ... // RX and TX ...
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