When our arduino sends a HIGH signal to the transistor’s base, it switches the transistor (connecting the collector and emitter) and completes the circuit for the motor, solenoid, or light. Ground is connected to the transistor’s collector. So we connect it so that our motor, solenoid or light is connected to V+ but not ground (V-). When you send a HIGH signal to the base (control pin), the transistor switches and allows current to flow from the collector (in) to the emitter (out). You basically have an In called the Collector, an Out called the Emitter, and a Control called the Base. If you don’t know transistors at all, they are 3 lead components that have 2 simple functions, to switch or amplify (in this example it is setup as a switch). WARNING: I am about to simplify the crud out of this, so beware… it is here in an attempt to explain, in simple terms, what is going on. The reason I’m covering this particular transistor is because it is readily available, and you can usually pick one up from Radio Shack, Adafruit or other local parts store in a jam, but you can use any NPN darlington transistor like the BD651 exactly the same way. Sensors, LEDs, ICs, and the like are all capable of being powered directly from your Arduino, but as many awesome 5 and 3.3v components as there are, eventually you will find yourself holding a 12v solenoid, motor, or light and wondering “How the heck am I supposed to control this from my Arduino?” Well today we are going to talk about doing just that from a magical device know as a transistor, specifically the TIP120 Darlington Transistor. Up until now, we have talked about working with a lot of low-power devices. Arduino Tutorial Online Courses Video Training.Arduino Nano Projects List in PDF offline downloadable.Android based arduino Projects List Download PDF.esp8266 arduino projects list in pdf offline downloadable.Arduino Proteus Projects List for Download.Arduino UNO Projects List in PDF offline downloadable. Arduino Mega 2560 projects list in PDF offline downloadable.Arduino Complete Projects List PDF Downloadable.Huge List of tutorials & Components based resources.
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