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We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Megan Wollerton Following a new round of testing, we have added a number of ...

Looking for an alarm system to make you feel more secure? We've tested all the top professional and DIY home security systems to help you decide which is right to protect your family and property.

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void setup() { // Start Serial2 at 4800 baud // RX = 16, TX = 17 Serial2.begin(4800, SERIAL_8N1, 16, 17); } Serial2.begin(...): initializes secondary serial ...