Stepper Motor HAT User Manual
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COTNROL PROTOCOL
H-BRIDGE
H-bridge is a popular motor control circuit. It is named because it looks like character
“H”. It consists of four transistors/MOSFET, motor is connected on the center, you
should through two transistors in diagonal line to drive motor.
When Q1 and Q4 is accessed, current flow from positive pole->Q1 to Q4->negative
pole, then motor moves forward.
When Q2 and Q4 is accessed, current flow from positive pole->Q2 to Q4->negative
pole, then motor moves backward.
If it is two H-bridge, there will be two set of output lines, for example, stepper motor
has four wires which is two H-bridge.
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