Exporer Uno PCB Software Template

Go beyond the Arduino with this customizable Uno template. Take your prototypes to the next level!

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If you’re like us, you spend a lot of time prototyping new projects, starting with a breadboard, a handful of jumper wires, and whatever microcontroller seems to be an ideal fit for your vision. But there is something about the breadboard that feels unfinished.

This really left us thinking: How can we create a quicker path to PCB for all who design with the open-source hardware we have come to love? So we looked at the projects we’d built and found commonalities in the circuits, which we then used to create a pre-built, verified, ready-to-use template.

We’d like to introduce you to the Explorer Uno. Our first template, based on the board that started it all, the Arduino Uno. With the Explorer Uno, all you need is a breadboard, an Arduino Uno project and Patchr to make your idea a reality. We’ve used this template in everything from cosplay to IoT to #badgelife and art installations.

The Explorer Uno is perfect in that it has all the GPIOs you have come to love with the Arduino Uno with the ability to connect directly to them and delete the pins you don’t use. We’ve put together a diagram for you that shows which components are vital and which ones you can remove.


Comma-Separated Values - 1.49 kB - 11/06/2019 at 00:20


  • 1 × ATmega328 DIP Package Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
  • 1 × 16 Mhz Crystal
  • 1 × 6-Pin Female Header
  • 2 × 8-Pin Female Header
  • 1 × 3-Pin Female Header

View all 14 components

  • 1
    Designing and Exporting

    Check it out — all we need to do is log in to Patchr, select the “Explorer Uno” template next to the create new project button, annnnnnnnnd… Bada bing, bada boom! It’s ready to go. You can change the board footprint, add components, or just export as is.

    We've included a BOM with the correct components linked below or you can use the component section above to buy items individually.

  • 2

    Once you've received your components and your PCB, you're ready to assemble them. There are a lot of configurations that can work, so keep in mind the final shape of your PCB is entirely up to you and the project you are building!

    Let's start with the core of the Explorer Uno, the ATmega328, the brains. This is what tells your project what to do and when to do it.

    Tip: Make sure that the indent on the top of this chip is facing down. You can also use a 28 pin IC socket to make it a bit easier to program and flip in case the ATmega328 is upside down.

    Button & Resistor - This helps reset your project once the software has been uploaded into the ATmega328.

    Clock & Capacitors - Time! This 16 MHz beauty counts the seconds so you don’t have to.

    Switch - On and off, on and off, on and off. We added a red LED so you can tell when the Explorer is on.... or off.

    LED Pin 13 + Resistor - This is your proof of life light when uploading software or running simple sketches look at this light to be sure everything is running smoothly.

    Voltage Regulator - This bad boy helps make sure the only thing you are blowing is people’s minds… and not the components on your PCB. We like to use a 9V battery to power our projects, and this will drop it down to 5V to keep everything running smooth.

    Power - There are so many options here. You can use anything that supplies 5V or more. Just connect the positive and negative leads to the through holes as shown in the diagram above.

    Headers: These are totally optional — we like to keep them open to solder directly to or you can use jumper cables and female headers to prototype with.

  • 3
    Programming Your Explorer Uno

    So here’s the fun part. Let’s upload your sketch to the Explorer Uno. We suggest you do it in one of two ways. The first is to place your ATmega328 in an empty Arduino Uno and upload how you would normally upload to your Arduino.

    The second is to use an empty Arduino Uno as a bridge to the Explorer Uno to program it. You will want to wire up the Arduino using this diagram:

View all 4 instructions

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