HaLiTerm Prototyping Addon

A breakout-protoboard combo with status LEDs for the handheld Linux terminal.

Balazs

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Description

This is a breakout board and protoboard in one for convenient access to the GPIO pins on my handheld Linux terminal. The GPIO connector is compatible with the 24 Pin header of the NanoPi NEO/NEO2/NEO Air. The GPIO status LEDs are driven by logic buffers and have their own 3.3V regulator to avoid draining current from the GPIO pins.

Details

// Background

This is the first addon for my handheld Linux terminal. The GPIO pins on the back of the terminal are rather inconvenient to connect with a breadboard. A front-facing addon over the display with GPIO connectors and a breadboard would turn it into a compact handheld prototyping device.

It is also a good excuse to keep practicing PCB design and try SMD soldering.

Files

HaLiTerm-protoboard-addon.zip KiCad design files. x-zip-compressed - 489.18 kB - 08/19/2023 at 15:22		Download
haliterm-protoboard-gerbers.zip x-zip-compressed - 110.83 kB - 08/19/2023 at 15:21		Download

Components

1 × MCP1700T-3302E/TT Linear Voltage Regulator, 3.3V, 250mA
2 × 74HC4050D Buffer, Non-Inverting, 6 Element
12 × 150060BS55040 Blue 470nm LED, 3.2V, 0603
4 × 150060SS55040 Red 630nm LED, 2V, 0603
2 × 1 µF ceramic capacitor, 0603

View all 9 components

Project Logs

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Almost finished
Balazs • 08/22/2023 at 18:17 • 0 comments

I finished soldering the board and started testing it. I realized, that I have switched up pin 11 and 22. I wanted to order it in black anyway...
One step closer
Balazs • 08/16/2023 at 17:47 • 0 comments

The PCBs have finally arrived today, so I was excited to start soldering. Fitting to the epic series of unlucky events I am experiencing recently, I have received 6.2k Ohm resistors instead of 390 Ohm ones. Patience is a virtue...

Update - I soldered together what I could and I am very happy that it works. The LEDs powered by 5mA are a little too bright. I need to start tweaking the resistor values.