2 layers22.9 × 25.4 mm
2 layers50.8 × 33 mm
HBridge84
UserHackable/HBridge84This is the User Hackable HBridge84 Project.
- Size
- 50.8 × 33 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 19
- Pads
- 85
- Tracks, vias
- 136, 19
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 11 Mar 2016
- Updated
- 20 Jul 2026
Overview
HBridge84 is an open-source printed circuit board by UserHackable, from the UserHackable/HBridge84 repository on GitHub. It is a 2-layer board of 50.8 × 33 mm with 23 parts on 19 nets, routed with 136 tracks and 19 vias.
It is built around the ATTINY84A-PU and SN754410NE. Its parts include 6 connectors and 1 capacitor. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATTINY84A-PU
DIP-14-40℃~+85℃ 1.8V~5.5V 10bit 12 20MHz 512Byte 512Byte 8 Bit 8KB AVR Built-in FLASH DIP-14 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
SN754410NE
PDIP-16-40℃~+85℃ 1A 4.5V~36V 4.5V~5.5V Bipolar Driver Over temperature protection、Dead-time / shoot-through protection PDIP-16 Stepper Motor Driver ROHSTexas InstrumentsStepper Motor Driver
README
README.mdUser Hackable HBridge84 Project
This is the User Hackable HBridge84 Project.
It's purpose is to be a compact driver board for cars or robots.
Brains
The microcontroller used by this project is the ATtiny84 chip manufactured by Atmel. To program this chip using the Arduino environment, you will first need the ATtiny board definition file from High Low Tech.
It includes:
- a C++ library for the Arduino IDE
- the Eagle Cad schematic and board layout files
Arduino Installation
- Start with a recent install of the Arduino IDE.
- Install the ATtiny library from High Low Tech.
- Make sure you have an AVR ICSP programmer like the Sparkfun Pocket AVR Programmer with it's drivers installed.
- Install this library by placing this entire folder as a subfolder in your Arduino/libraries folder.
HBridge84
Board dimensions
- (200000, 130000) original units
- (2.0000, 1.3000) inches
- (50.8000, 33.0200) mm
| Front | Back |
|---|---|
 |  |
RJ11Breakout
Board dimensions
- (70000, 70000) original units
- (0.7000, 0.7000) inches
- (17.7800, 17.7800) mm
| Front | Back |
|---|---|
 |  |
RJ11-ICSP-Breakout
Board dimensions
- (90000, 100000) original units
- (0.9000, 1.0000) inches
- (22.8600, 25.4000) mm
| Front | Back |
|---|---|
 |  |
Parts
23Questions
How big is the HBridge84 PCB?
It measures 50.8 × 33 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HBridge84 use?
23 parts, built around the ATTINY84A-PU and SN754410NE. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the HBridge84 KiCad files?
From the UserHackable/HBridge84 repository on GitHub, at the commit this page was made from: the board is KiCad/HBridge84/HBridge84.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the HBridge84 design in my own project?
Its repository states no licence, so its author keeps all rights: ask UserHackable before reusing the design.
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