MIT licence: what you may do with our sensor firmware
You get the source code of our ESP-NOW sensors under the MIT licence. It is one of the shortest and most permissive open source licences: you may do almost anything, on one condition.
What the licence does
Four rights, without asking
You don’t need anyone’s permission and you don’t have to report anything. Not even to us.
Use
Flash the firmware onto as many ESP-NOW sensors as you like, on your own farm or at a customer’s site. There is no counter and no licence key.
Modify
Add a sensor, change a measuring interval or rewrite the logic. You don’t have to give your changes back. If you do send them, we will likely include them in the main version.
Share
Pass the code on to your installer, a fellow grower or a study group. You may distribute a modified version too.
Commercial use
If you build a product or service on it, that is allowed. You may even sell the code, without paying us anything.
The only condition: the licence text stays with it
If you pass on the code or a substantial part of it, keep the copyright line and the licence text. That is all the licence asks.
You don’t have to report what you do with it, credit us on your website or open up your own code. In practice it means: leave the LICENSE file in the folder.
Copyright (c) 2026 EasyData B.V. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Highlighted: the one condition. The licence text itself is what counts; this page explains it and does not replace it.
Two things that are not in it
No warranty
The code comes ‘as is’. Under the licence we are not liable for what happens if you modify it or use it elsewhere. What we do commit to as part of your subscription is in your subscription and our terms, not in the licence.
No right to our name
The licence covers the code, not the FairGrow name or our logo. If you distribute a modified version, do so under your own name, so nobody thinks it comes from us.
MIT next to two alternatives
| MITour sensor firmware | Copyleftsuch as the GPL | Closedlike most sensors | |
|---|---|---|---|
| Run the firmware on your sensors | |||
| Read the source code | |||
| Modify it yourself | |||
| Pass it on, modified too | |||
| Pass it on without opening your own changes |
A copyleft licence such as the GPL requires anyone who distributes a modified version to release that version under the same licence. That protects the code, but it holds back an installer who builds something custom for a customer. MIT imposes no such duty.
And the licence has no end date. Code you have downloaded is yours to keep using, even if you ever stop using FairGrow. That fits how we think about ownership of your sensor data, and about standard sensors without lock-in.
Questions we get
What is the MIT licence?
A short open source licence that originated at the Massachusetts Institute of Technology. It gives anyone who has the code the right to use, modify, share and sell it, provided the copyright line and the licence text stay with it.
Which FairGrow code does it cover?
The source code of the firmware of our ESP-NOW sensors. Paying subscribers download it at no extra cost. What exactly is open is on the firmware page.
Do I have to share my changes?
No. You may keep a modified version to yourself or distribute it on your own terms. If you do send us an improvement, we are happy to include it in the main version so everyone benefits.
May I publish the code, for example on GitHub?
Yes. The licence allows it, as long as the copyright line and the licence text are included.
What happens if my subscription ends?
The code you already have, you may keep using and modifying under the licence. New versions are available to download while you are a subscriber.
Is this legal advice?
No. This page explains in plain language what the licence says. If in doubt, the licence text itself applies, and for a specific question about your situation it is best to consult a lawyer.
See what is open
The firmware page explains what you get with your subscription and what you can do with the source code.