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Not another simple power board... this is an all in one solution for your Pi with RTC, Fan, battery voltage monitor and remote trigger!
Not another simple power board... this is an all in one solution for your Pi with RTC, Fan, battery voltage monitor and remote trigger!
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84 backers pledged €3,334 to help bring this project to life.
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About

Pi PowerBoard - a programmable power board for Raspberry Pi

€3,334

84

What is a prototype?

A prototype is a preliminary model of something. Projects that offer physical products need to show backers documentation of a working prototype. This gallery features photos, videos, and other visual documentation that will give backers a sense of what’s been accomplished so far and what’s left to do. Though the development process can vary for each project, these are the stages we typically see:

Proof of Concept

Explorations that test ideas and functionality.

Functional Prototype

Demonstrates the functionality of the final product, but looks different.

Appearance Prototype

Looks like the final product, but is not functional.

Design Prototype

Appearance and function match the final product, but is made with different manufacturing methods.

Production Prototype

Appearance, function, and manufacturing methods match the final product.

4e7d757845cdc151cf8388062215b226 original.jpg?ixlib=rb 2.1

Prototype Gallery

These photos and videos provide a detailed look at this project’s development.

Prologue: Some time ago, in an hot summer night, was surfing the web to find a suitable car power adapter for my Raspberry Pi and couldn't find what I was looking for; there were some options, but none fit my design (without substancial hacking or a ton of wiring)... so I designed this board. A programmable power board 12v->5v with some extras.

The problem: I needed a way to power a Raspberry Pi and a 7inch display in my car, a way to sense ignition key and power On/Off the screen and, in turn, cleanly shutdown the Pi and the buck converter.

Being it a Dash/CarPc I needed to keep startup times reasonable and avoid continuosly power on/off the Pi (thinking of a normal car usage, start in the morning, go to work, get back and stop at the mall and so on)...

The solution: I made a tiny board with a 12v->5v buck converter rated 3a@5v, an Attiny85, a separate linear voltage reg for the Attiny, an RTC DS3231, a backup battery (for RTC), and a 25mm fan.

How it works: The Attiny85 senses ignition switch, car battery voltage and Raspberry Pi status (Powered On, Powered Off or Screensaver), then (based on a Python script on your Pi) determines to shut off the buck converter or keep it on.

The board design frees almost all the gpio pins as Attiny and RTC relies on i2c to communicate back and forth with Rasberry, Fan is on the same 5v bus as the Pi, so It's ON whenever the Buck Converter is on.

For quiet operations and non stressing applications I choose a 12v fan working on 5v, for more demanding uses It's best to use a 5volt one at full speed. It could also be tied on a GPIO pin to enable PWM control based on processor temp.

The Attiny85 senses ignition switch, car battery voltage and send data to the Pi, which, in turn sends its status (Powered On, Powered Off or Screensaver).

The Raspberry, based on a Python script on your Pi desktop determines to stay on, on screen saver or to shut down; in case of shut down sends a command to the Attiny to shut off the buck converter to minimize battery consumption. A battery voltage threshold can be used to trigger also a clean shutdown before battery goes flat.

Risks and challenges

I have absorbed most of the project risks by shouldering the financial and engineering uncertainties on my own already, as a proof one PiPowerPack is fully working in my car since 4 weeks, never missed a beat, a second one is on my Kodi Pi, on 24/7 since august.

Other risks could come from the supply chain, but I'm 100% confident on my PCB maker (serving me since 5 years and never had a single problem on quality and timing) and local parts supplier.
I feel confident that I'll ship (in case of funding) by the given timeframe.

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Support

  1. Select this reward

    Pledge €1 or more About US$ 2

    Show us your support (in espressos!)

    Show us your love, an espresso (we are Italians after all ;-) ) is always welcome!

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    1 backer

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  2. Select this reward

    Pledge €25 or more About US$ 29

    The Early bird Bandwagon!

    Power to the Pi!
    Be the first to support this bandwagon and enjoy your Pi PowerBoard at sale price!
    You'll receive a Pi PowerBoard, fully assembled and tested, ready to fire up your Pi at the flick of a switch!

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    Limited 68 backers

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  3. Select this reward

    Pledge €25 or more About US$ 29

    The Makers Special!

    We think in Makers terms... because we are makers! This reward lets you receive a fully disassembled Pi PowerBoard plus all parts needed for the build. This way you can reprogram the Attiny85 or modify the sketch to fit your needs.

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    Limited 4 backers

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  4. Select this reward

    Pledge €35 or more About US$ 40

    The Pi Powerboard!

    Fully assembled, tested, tuned and ready to rock your Pi in car, on your desktop or anywhere else!

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    3 backers

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  5. Select this reward

    Pledge €65 or more About US$ 74

    The twins!

    Keep a spare one always ready to power your next project!

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    5 backers

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  6. Select this reward

    Pledge €90 or more About US$ 103

    The triplet!

    Three is the perfect number, so...

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    1 backer

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Funding period

- (30 days)

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