Arduino Transistor Relay Driver

In this article we will comprehensively study a transistor relay driver circuit and learn how to design its configuration by calculating the parameters through formulas.

Arduino transistor relay driver.

Thus if very low current about 100 ua the relay driver circuit can provide current up to 250 ma. Relays are one of the most important components in electronic circuits. In this project the npn transistor 2n2222 drives the relay when the npn junction gets saturated. Mehrere leds motoren oder elektromagneten schalten ist das zu wenig.

Will man aber z b. When the input signal passes through the i k resistor to the base of the transistor it conducts and pulls the relay. If the transistor base terminal is 0 low then fan turns off for delay and other you can set with help of arduino ide and arduino uno. The relay is connected between the positive rail and the collector of the transistor.

Cooling fan for my testing you can choose different 12v output one. The switching contacts of a relay are completely isolated from the coil and hence from the arduino. Ein digitaler ausgang des arduino duemilanove kann einen strom von 40 ma bereitstellen. Das reicht für kleine signale aus.

Now that we re using a transistor to drive the relay we can use considerably less power to get the relay driven. And one simple npn transistor. Der vorteil ist dass ein transistor. Especially in circuits where high power transfer or mains ac load switching is involved relays play the major role in implementing.

This video npn transistor based 12v dc relay control drive simple make it this type transistor is a semiconductor device used to switch electronic signals a. A relay accomplishes this by using the 5v outputted from an arduino pin to energize the electromagnet which in turn closes an internal physical switch to turn on or off a higher power circuit. If we use a transistor that has gained about 50 times and use one transistor to increase up to 2500 times 50 50. Therefore we need a device to amplify the current.

Once the base receives sufficient power the transistor will conduct from emitter to. Below is the circuit of a relay driver using the npn transistor bc 548. Ein transistor kann als schaltverstärker eingesetzt werden. Increasing current gain of transistor relay driver.

Importance of relay. The basic transistor switching with arduino for arduino digital 7th pin is output if the arduino send logic 1 high the mini cooling fan turns on. Because a transistor is an amplifier we just have to make sure that the base lead gets enough current to cause a larger current to flow from the emitter of the transistor to the collector. Hierfür benötigt man eine verstärkerschaltung.