"posts"

Hacking the TTI Indoor Gateway

Four years ago The Things Network (TTN) kind of revolutionized the IoT world with their effort to reduce hardware and software costs to implement a commons LoRaWAN network. Their bet was backed on Kickstarter by almost a thousand people with almost 300k€ to help create a low-cost LRaWan gateway (and a platform and end devices too). The gateway took it’s time to become a reality (kickstarter-effect) but by the time it was released the project had already impacted other players in the industry and low cost DIY gateways were a reality....

Analyze your antennas using an AAI N1201SA

Following up with the series of affordable RF tools I started with the RF Power Monitor 8000, maybe the N1201SA by Accuracy Agilty (sic?) Instrument (AAI) is one of the most exciting devices around. The device is sold as “RF Vector Impedanze Analyzer” and, although it’s not a full VNA (Vector Network Analyzer), it gives you enough information to profile your antennas and, according to some reviews, it’s so accurate it can compete with professional equipment....

Grove AI Hat, edge computing in your hands

The industry has been talking about edge computing for some time now. The idea is to distribute the data storage and intelligence in locations closer to where they are needed and only use external services when absolutely necessary. Centralized cloud services have a series of drawbacks for the IIoT world, being maybe latency and security the bigger ones. Some (a lot of?) companies do not want their data to go outside their facilities and critical systems cannot rely on Internet connection....

RF power monitoring tools on the cheap

Recently we at @ttncat had to prepare a crash course on LoRa, LoRaWAN and The Things Network for a professional school in Barcelona. It was a 15 hours course that covered from the very basics to some more advanced topics on RF like link budget, attenuation or impedance matching. It was fun to go back to my years at college and revisit and update some of those topics. And at the same time it was a great opportunity to upgrade my toolbox....

Automated unit testing in the metal

Unit testing your code is peace of mind. It has two main direct benefits that impact on your confidence about the code you are writing: Testing expected behaviors Avoiding regressions (i.e. breaking something that was working fine before) Unit testing embedded systems is a bit more involved since there is the additional constraint of the hardware itself, sometimes more than one device or even different platforms. Quitting (or not even thinking about it) is the easy answer to the problem....

Monitor your TTN gateways with Node-RED

This time I’d like to write a quick post about a small project we’ve been working on at the The Things Network community in Barcelona (@ttncat). We were worried about the monitoring of the gateways we have deployed, both as a community but also as individuals. Some of our partners have also deployed their own gateways and they are part of the community. The TTNCat gateway at Vista Rica in Barcelona So how do we get (almost) real-time notifications of incidences in the local TTN network?...

WhiteCat ESP32 N1

I do not do reviews usually, but I sometimes do exceptions. In this case, it’s worth doing it, due to 4 main reasons: It’s a software & hardware open source project It’s local (local to me, that’s it) It’s led by two good friends It’s related to LoRa and The Things Network It’s awesome! OK, they were actually 5 reasons, but the last one just slipped in....

Useful notifications from your home appliances using Node-RED

Some time ago I worked on a home project to get a notification when my washing machine had done its job based on monitoring its power consumption. There was a good reason for that, the machine was outside the house and I had already forgotten about the laundry several times. And when that happens your only option is to wash it again, because it really smells musty… Monitoring your appliances Use ESPurna :)...

RAK833 meets Raspberry Pi

You might have heard about The Things Network (TTN from now on) here or somewhere else. If you have not, then it’s a good opportunity to visit the project and check if there is a community of users around you. I have been a core member of the TTN Catalunya community for over 2 years now. This year we are working hard deploying several new gateways in Barcelona and doing workshops and hackathons with the main goal of helping individuals and social entities to carry out projects around a LoRaWan open, libre (free as in freedom) and neutral telemetry network....

M5Stack node for The Things Network

I have a couple of IKEA-like boxes in my home office labeled “Inbox”. They are full of stuff I buy and store waiting for some free time to spend on them. From time to time I pick one of the boxes and take a look at its contents. They are actually full of “wow” stuff. I would buy again most of the things there but at the same time I fear I’m just collecting stuff that will become junk....