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3.2 Hummer Bot Module experiment
3.2.1 Walking Principle of the Car
In the "Hummer-Bot" car, we choose the L298N as the motor driver chip for it is a high voltage and
current full-bridge driver chip, the chip uses 15 pins package. It is a special motor driven integrated circuit
(two H bridges) with high voltage and current full-bridge driver. And it contains 4 channel logic drive circuit,
basically belongs to a kind of two-phase and four-phase special motor drive which contains two H bridges of
high voltage large current. The output current is 2A, the maximum current is 4A, the maximum working
voltage is 50V, which can drive the load under 46V and 2A, such as high power DC motor, stepper motor,
solenoid valve and so on. The chip with two enable control terminals uses the standard logic level to control
signals, allows or prohibits the device to work when the input signal is not interfered, it has a logic power
input terminal which can enable the internal logic circuit to work under low voltage, and feedback the
variation to the control circuit. Especially, the input can be connected directly with the MCU and easily
controlled. When the DC motor is driven, the stepper motor can be directly controlled, and it can be turned
forward and reversely, which only needs to change the logic level of the input. The pin arrangement is
shown in Fig.3.2.1. The pin 1 and 15 can separately connect to the current sampling resistor and form the
current sensing signal.
L298N can drive 2 motors which are connected between OUTl, OUT2 and OUT3, OUT4. 5, 7, 10 and
12 pin are connected to input control level for controlling the positive and negative rotation of the motor,
ENA, ENB are connected to control enable terminal for controlling the running and shutdown of the motor.
Its characteristics:
Figure .3.2.1 Arrangement of Chip Pins
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