HardLabs

7Driver

Broosky·7Driver·KiCad/7Driver.kicad_sch

This repository ships a schematic but no board layout.

About the 7Driver PCB

7Driver is an open source AVR/Arduino PCB design by Broosky, published on GitHub. It is a board, with 28 components from 13 distinct parts.

Its main chip is the Arduino UNO R3, from the AVR/Arduino family. Other key parts include the 74HC595, 74LS14, 74LS155 and F3461BH. By type, the board carries 10 resistors, 6 capacitors, 4 ICs, 4 connectors, 1 module and 1 buzzer.

It belongs with the displays & leds designs in this gallery.

From the project

A serially-driven 7-segment display controller with a few classic TTL chips.

A 4-digit 7-segment LED display driver built on a Saturday years ago, using an ATmega328P Arduino and a couple of spare TTL logic chips (74XX595 and 74XX155). Designed as part of a larger bench ecosystem, this module emphasizes classic hardware logic, multiplexing, and minimal pin usage via serial interfacing.

- Displays numbers on a 4-digit 7-segment LED display. - Built using: - 74XX595 – shift register (serial data output). - 74XX155 – 2-to-4 line decoder/demux. - Controlled by an ATmega328P. - Segment timing and animation handled in software. - Performs a Power-On Self-Test (POST) to…

Main components on the 7Driver

74HC59574LS1474LS155F3461BHArduino UNO R3

7Driver bill of materials (BOM)

28 components, 13 distinct parts.

QtyPartRefs
1
74HC595
U1
1
74LS14
U2
1
74LS155
U3
1
F3461BH
U4
1
Arduino UNO R3
A1
4
5V Bus
J1, J2, J3, J4
1
Buzzer
BZ1
2
10k
RV1, RV2
1
470uF
C1
2
150nF
C2, C6
3
47nF
C3, C4, C5
4
2k
R1, R2, R3, R4
6
10k
R5, R6, R7, R8, R9, R10

7Driver design files

The KiCad project lives in the Broosky/7Driver repository on GitHub; these links point at the commit this page was built from.

7Driver: common questions

What microcontroller does the 7Driver use?

The 7Driver is built around the Arduino UNO R3, from the AVR/Arduino family.

How many components are on the 7Driver?

28 components, from 13 distinct parts. The full bill of materials is listed on this page.

Where can I download the 7Driver design files?

From the Broosky/7Driver repository on GitHub, which has the schematic; the links under Design files point to each one.

Can I use the 7Driver design in my own project?

The repository has no license, so all rights stay with Broosky. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the 7Driver without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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