DC motor controller using IR2110

I will show you how I create a DC motor controller. It will allow me to change the speed and direction of the motor.

This drawing here shows you the basic structure of the project. The potentiometer controls the PWM generator to change the duty cycle. This signal then goes to a h-bridge made of two IR2110 mosfet drivers and four mosfets. The switch controls which combination of mosfets get the PWM signal and by doing so determines the direction of the motors rotation.

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Measuring voltage on an Arduino

Being able to measure voltages automatically with a micro-controller is a very useful feature. Although the ADC on a micro-controller is limited to measure between 0V and 5V, this range can be extended quite easily using a special type of resistor network called a resistor divider.

In this tutorial I will be explaining how to read a voltage on an Arduino into an integer and how to convert that to a voltage. In future tutorials I will show you how to expand or narrow this measuring range.

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High side mosfet driving using the IR2110

Power mosfets are difficult to drive properly when on the high side, this is because the voltage of the mosfets drain is floating, meaning not on a fixed voltage. In this tutorial I will use the IR2110 as a dedicated high side gate driver for my mosfet, which will be switching a +12V car light. An Arduino with a simple blink sketch will provide the switching logic for the circuit.

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IR2110 mosfet driver quickstart guide

IR2110 capabilities

  • The IR2110 comes in both DIP and SOIC packages.
  • One high side channel. You can switch any side of a load, high, low, in the middle, its al good.
  • One low side channel. You can switch the ground side of a load.
  • Channels are independent. Also, you can use a single channel and ignore the other.
  • High side maximum voltage of 500.
  • Mosfet gate voltage between 10 and 20. Choose a mosfet that matches this. Also, you must provide this voltage to the IR2110.
  • Can understand logic between 3.3V and 20V. Connect directly to your Arduino, Atmel or PIC. You must provide your logic voltage source to the chip so it knows what to expect.
  • Can switch ON and OFF at maximum frequency of 5Mhz. This is more than 50 times faster than an Arduino can do PWM.

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