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Hello damn dog see here from Optronics calm in this Arduino tutorial we will learn how to control DC motors using Arduino we will take a look at some basic techniques for controlling DC motors and make two examples through which we will learn how to control DC motors using the l2 98n driver and the Arduino board at the end we will be able to build and control our own Arduino robot car we can control the speed of a DC motor by simply controlling the input voltage to the motor and most common methods of doing that is by using PWM signal PWM or pulse width modulation is a technique which allows us to adjust the average value of the voltage that is going to the electric device by turning on and off the power at the fast rate the average voltage depends on the duty cycle or the amount of time the signal is on versus the amount of time the signal is off in a single period of time so depending on the size of the motor we can simply connect an Arduino PWM output to the base of a transistor or a gate of a MOSFET and control the speed of the motor by controlling the PWM output the low-power Arduino PWM signal switches on and off the gate at the MOSFET through which the high power motor is driven on the other hand for controlling the rotation direction we just need to invert the direction of the current flow through the motor and the most common method of doing that is by using an H bridge an H bridge circuit contains four switching elements transistors or MOSFETs with the motor at the center forming an H like configuration by activating two particular switches at the same time we can change the direction of the current flow does change the rotation direction of the motor so if we combine these two methods the PWM and the H bridge we can save a complete control over the DC motor there are main DC motor drivers that have these features and the l2 98n is one of them the l2 98 M is a dual edged rich motor driver which allows speed and direction control of 2 DC motors at the same time the module can drive DC motors that have voltages between 5 and 35 volts with big currents up to 2 amps let's take a closer look at the pin out of the l2 98n module and explain how it works the module has two screw terminal blocks for the motor a and B and another screw terminal block for the prop in the VCC for the motor and a 5 volts pin which can either be an input or output this depends on the voltage used at the motor VCC the modules have an onboard 5 volts regulators which is either enabled or disabled using a jumper if the motor supply voltage is.