LEGO Rocket Launcher - Part 2 - Motor driver

To drive the 3 Lego motors I use two 754410. Each ic has 2 h-bridge driver.
To provide 9 volts for lego motors and 5 volts for logic signals I use 7809 and 7805 voltage regulators to drop down 12 volts from power supply.

  • M1, M2, M3 are board outputs to motors
  • C1, C2, C3 are input control pins; you can start and stop motor and set clockwise / anticlockwise rotation
  • I use an old 12v/2A  power supply taken from an external hard disk 

BOM:
  • 2 x SN754410NE
  • 1 x LM7805
  • 1 x LM7809
  • 2 x 0.33uF (input capacitors)
  • 2 x 0.1uF (output capacitors)
  • 2 x 16 pin sockets
  • 12v power supply
  • connector for power supply

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