dc motor speed controller using arduino Opções

dc motor speed controller using arduino Opções

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SHOPEE COMPRAR AGORA

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L293D is an H-BRIDGE IC designed for driving low power DC motors and is shown in figure. This IC consists two h-bridges and so it can drive two DC motors. So this IC can be used to drive robot's motors from the signals of microcontroller.

*Avoid using high voltages and currents as this can damage the components and be dangerous to work with.*

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Connect the left pin of the potentiometer to the drain pin of the mosfet, the middle pin to the gate pin of the mosfet, and the right pin to the negative wire of the 9V battery clip.

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Connect one resistor to the power supply. One end of the wire must be connected to one end of the resistor. Using a middle-value resistor out of the set first will give you an idea of whether to increase or decrease the resistance depending on the speed of the motor.

Now, let’s see what value you should pick for the PWM resolution. It totally depends on the levels of control you want to have over the motor’s speed. And it should be the same as the ADC’s resolution for the potentiometer used for control.

And by using the inverter circuitry to also adjust the voltage into each coil, we can in addition control the magnitude of the current. A typical way to adjust the voltage is with pulse width modulation (PWM). In this approach, we alter the voltage by lengthening or reducing the pulse ON time (also referred to as the “duty cycle”: the ON time expressed as a ratio of the ON+OFF switching interval).

Starting torque: The maximum torque a motor produces to begin the rotational movement of the load. DC motors have a high starting torque.

PWM stands for Pulse Width Modulation. It basically describes the type of the digital signal. PWM technique is an excellent technique to control the analog circuits with microcontroller's digital PWM output. In this technique we can get analog results with the digital means.

You basically right-click the project name in the IDE’s navigator and choose to create a new > source folder. And name it ECUAL and go to the GitHub repo, download the files and copy the “DC_MOTOR” folder and back to the IDE, right-click on the ECUAL and paste the library into it.

However, in case the PWM frequency is too high, the MCU may have problems with generating PWM signals of the required value. In addition, the very high frequency may lead to the malfunction of the gate driver and transistor switches as they may not be compatible with it.  

At the beginning of this tutorial, I’d like to make sure that all of you have the basic concepts behind DC motors operation and how we use PWM signals to control the speed of a DC motor. How an H-Bridge works and does the polarity-inversion to control the direction of the motor’s rotation.

SHOPEE COMPRAR AGORA