Pressure controls have been workhorses in the hvacr industry for decades. Figure 1 shows a conventional combination low- and high-pressure control. Such controls have been used in many applications, ...
In this quick Arduino tutorial I will explain how you can control a relay using the Arduino Board, one 1K and one 10K resistors, 1 BC547 transistor, one 6V or 12V relay, one 1N4007 diode and a 12V fan ...
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