E05 - Motor Driver

Overview • Repository Organization • Releases • License

Overview

This project involves the development of a DC Motor Driver module tailored for the E05 (Transistorized Analog Electronics) course at Inatel. The system is engineered to handle electromechanical switching using a purely analog architecture, providing robust motor control based on a BC547 NPN transistor acting as a driver for a 5V SPDT relay (Songle SRD series). The hardware design incorporates inductive spike protection via a 1N5408 flyback diode, input state stabilization through a push-button with a pull-down network, and real-time visual feedback via an LED indicator.

Repository Organization

• docs: Technical documentation and datasheets.
• hardware: Core hardware files.
  • 3D: 3D models (.step).
  • Fabrication: BOM and Gerber files for JLCPCB manufacturing.
  • PCB: KiCad schematics and layout design.

Releases

Render	Board Name	Status	Latest Release	Date	Datasheet	BOM	Ordering Info
	Motor Driver v1	✅ Released	v1r2	2026-06-19		No	GERBER (JLCPCB)

Circuit Operation

Figure (a) illustrates the driver module in its active state with the relay energized (latched) and the LED status indicator turned on while the push-button is pressed, completing the circuit to power the DC motor. Figure (b) depicts the circuit in its default idle state (relay de-energized) with no input applied to the button.

Figure 1: Side-by-side comparison of the mechanical mounting system: (a) Engaged state, (b) Disengaged state.

License

This project is licensed under the weakly-reciprocal CERN-OHL-W-2.0 open-hardware license. You are free to modify and distribute these files, provided downstream hardware design modifications remain under the same terms.

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_{📜 This project is part of Rorchive, my personal archive of activities and courses developed during my undergraduate studies at Inatel.}

_{Built with ❤️ by Rodrigo Andrade}