2 layers
2 layers54 × 19.7 mm
3PinLCDBackpack
jonsag/miscPCBsA collection of own designed PCBs
- Size
- 54 × 19.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 8
- Nets
- 23
- Pads
- 50
- Tracks, vias
- 110, 0
- Pours
- 42
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 3 Feb 2020
- Updated
- 5 Sep 2026
Overview
3PinLCDBackpack is an open-source printed circuit board by jonsag, from the jonsag/miscPCBs repository on GitHub. It is a 2-layer board of 54 × 19.7 mm with 8 parts on 23 nets, routed with 110 tracks and 0 vias.
It is built around the 74HC595 and BC547. Its parts include 3 ICs, 2 resistors and 1 transistor.
Main components
2README
README.mdmiscPCBs
A collection of own designed PCBs.
2PinLCDBackPack
Interface and Arduino to an HD4470 LCD using the I2C protocol.
Uses an PCF8574 I2C I/O bus expander.
3PinLCDBackpack
Interface an Arduino to an HD4470 LCD with 3 pins instead of 6.
Using the 74HC595 8-bit shift register with output latches.
8PinLCDBackPack
FM-Transmitter
A miniaturized FM transmitter.
LCDBackPack
The default way to control the HD4470 LCD.
medzik TDA2005 Amplifier
A basic amplifier using the 2-channel TDA2005.
rotaryToolMotorController
Schematics of a Dremel 3000 motor control.
TDA2005-amplifiers
1-channel bridged amplifier using TDA2005.
2-channel amplifier with tone, balance and loudness control. Also with TDA2005.
TDA2005R
An amplifier with PCB layout possible to etch at home.
Uses TDA2005.
Uber I2C LCD Controller Module
Even more control over the LCD.
Parts
8| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 10k | My_Misc:Potentiometer_Bourns_3339P_Vertical_large | RV1 |
| 1 | 1k | My_Misc:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal_larger_pads | R2 |
| 1 | 5-pin_LiquidCrystal595_connector | My_Headers:5-pin JST LiquidCrystal595 | U3 |
| 1 | 56R | My_Misc:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal_larger_pads | R1 |
| 1 | 74HC595 | My_Misc:DIP-16_W7.62mm_LongPads w socket | U1 |
| 1 | BC547 | My_Misc:TO-92_Inline_Wide_large | Q1 |
| 1 | Backlight control | My_Parts:Angled_Jumper_1x03_P2.54mm_large | JP1 |
| 1 | LCD_HD44780 | My_Parts:LCD_HD44780_16x2_w_headers_no outlinelarge | U2 |
Questions
How big is the 3PinLCDBackpack PCB?
It measures 54 × 19.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 3PinLCDBackpack use?
8 parts, built around the 74HC595 and BC547. 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 3PinLCDBackpack KiCad files?
From the jonsag/miscPCBs repository on GitHub, at the commit this page was made from: the board is 3PinLCDBackpack/KiCad/3PinLCDBackpack/3PinLCDBackpack.kicad_pcb and its schematic 2PinLCDBackPack/KiCad/2PinLCDBackPack/2PinLCDBackPack.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 3PinLCDBackpack design in my own project?
Its repository states no licence, so its author keeps all rights: ask jonsag before reusing the design.
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