From Project To Kit: Instructions Are Everything

A printed copy of the instructions for our example kit
A printed copy of the instructions for our example kit

We’ve had two previous articles in this series on turning a personal electronic project into a saleable kit, in which we’ve examined the kit market in a broader context for a new entrant, and gone on to take a look at the process of assembling the hardware required to create a product. We’ve used an NE555 LED flasher as a simple example , from which we’ve gone through the exercise of setting a cost of production and therefore a retail price.

The remaining task required to complete our kit production is to write the documentation that will accompany it. These will be the instructions from which your customers will build the kit, and their success and any other customers they may send your way will hang on their quality. So many otherwise flawless kits get this part of the offering so wrong, so for a kit manufacturer it represents an easy win into which to put some effort.

Keep it Simple

It is important to remember that the reader will never have seen the kit before and will not have your level of expertise on its operation, so you should pitch them as though at a relative novice. Imagine that a not-very-technical person is about to build your kit, and try to provide enough information for them to proceed without losing their way. This may at times seem as though you are pitching it at an impossibly low level, but your more tech-savvy customers will understand and take away only what they require.

We’ve produced a set of sample instructions for our NE555 LED flasher, and we’ll now step through them. You can download your own copy of the Hackaday LED flasher documentation (PDF). How you write your instruction leaflet is up to you as everyone has a personal style of their own, so these instructions will represent a particular style which may be different from that which you have in mind. They should serve as something of a guide though which you might wish to take inspiration from if you have never written kit instructions before.


Our NE555 LED flasher instructions take the form of a set of clearly delineated sections that introduce the kit, describe its operation, take the user through its components, give instructions for building it, and finally describe how it should be used. We’ll now step through each section in turn.

A mockup of our 555 LED flasher
A mockup of our 555 LED flasher

The very first paragraph is a short friendly introduction with a picture of an assembled kit. It doesn’t have to do much beyond saying what the kit does, it’s only an introduction. In our case the picture is a mock-up, this is only an example for this series of articles so we’ve not made any boards.

Following the introduction, we’ve written a section describing the tools and techniques needed. In this case it’s a pretty short piece of text because there are no special techniques required, but you might wish to expand here if for example your kit has surface mount components. It’s important to remember that some users may not have encountered all the skills required, your job here is to equip them for anything they might encounter.

The techniques section over, we move on to the components. Some kit manufacturers produce a table as a checklist here, but this is a simple kit so we’ve described those components that might be difficult to identify. You may wish to take a hybrid of the two approaches.

An example component placement diagram
An example component placement diagram

Once the user can identify everything, we move step-by-step through construction. This progression should be based on your experience of building the prototypes, you should note down the progression that worked best for you. Put three to five components in each step, and include a diagram showing their placement. You’ll notice our instructions have three-band resistors for ease of description, it’s likely that a real kit would come with five-band components.

The user should now have a completed kit. The next section should take them through any setup, fault-finding or troubleshooting required to ensure the kit is ready to be powered up. In this case it’s a short section as a 555 LED flasher is a very simple circuit, but you might include voltages and currents to measure with a multimeter before hooking a computer peripheral up, for instance.

There should now follow a section detailing how the kit should be used. Very short for an LED flasher, but for instance you might detail whatever software might be required for a computer peripheral kit, or how a more complicated kit should be connected up.

With building and operation out of the way, all that is left are appendices. We’ve put the circuit diagram in here but it could certainly go in the body of the document. You might find tables of values in here, or legal and regulatory information.

Test and Review

Once you have written your instructions, you’ll have to ensure the quality of your work. Ask your friends to proofread them, and if you can give a sample kit to one of them with the instructions to follow as they build the kit. Be prepared to incorporate responses to any criticism, imagine that the proofreaders represent real customers.

Having honed the document, it is important that you then present it in as good a way as possible. Print on good quality paper with a colour laser printer, and use double-sided printing if you can. They are as important to the kit as any of the components, so they should be treated accordingly.

If you have followed this series from the beginning, you should now be equipped to learn about the market in which your kit will compete, to turn your prototype into something closer to a product, and to create a set of top quality instructions for your customers to build it from. In the next part of this series we will bring what we have created in this and the previous part together as we examine kit packing and the process of producing your first kits for sale as products rather than simply as prototypes.

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