Working in Custodia, asset tracking solution with LoRa mesh and NTN 🛰️satellite. Making tracking reliable and accessible.
Joined October 2025
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363 Photos and videos
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This guy has been super busy wandering in the desert.
Check the dashboard!
Building a reliable tracker for livestock and wildlife in Custodia.
custodia.world/
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My first fully functional tracker PCB (XIAO nRF52840) vs my latest model (RAK4630)
The learning has been amazing in this year and a half.
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Using again my power profiler for the custom PCB I am testing. This time is the measurement of the Tx current consumption of different spread factors and message sizes. Code is running yet, but I am starting to see curious things. Lets wait for the end of the cycle to analize.
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Super interesting paper regarding ultra low power consumption LoRa.
I just read it right before to sleep to process it better.
Check it out:
pure.hw.ac.uk/ws/portalfiles…
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I achieved 38uA sleep current, baseline of the @RAKwireless is ~30uA. I discovered a mistake in my PCB schematic that leads to an always connected back up voltage, power consuption increases between 7 to 8 uA.
I am quite satisfied with the results!!!!
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Time for the truth, deep sleep plus RTC operation. I am programming using a RAK dap, after that I disconnect and plug the board to a Nordic PPKII
Next time I will make this easier with a jig or simply using a USB-C port, is very annoying to have to be connect and disconnect
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Power profiler test in my custom PCB.
Let’s get down those uA
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Tomorrow time to start to improve each individual code on power consumption.
I will be using a power profiler from nordic.
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Continuing the RV-3028 testing and debugging, I succesfully achieved RTC persistance after removal of main battery
I am usign as a back up a non rechargeable CR1220
This will enable time persistance and scheduling of events across deep sleep periods from the MCU
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More and more experimentation on this, now with the RTC.
I have successfully being able to read and to set and read time in the RTC module.
I also discovered some mistakes in the README from the library and the examples that @RAKwireless recommend for the RV-3028 RTC module.
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The mistake is in the init method for the I2C connection from the “Melopero_RV3028” library, in the examples they mention to use: rtc.initDevice() and the correct is Wire.begin() and then rtc.initI2C()
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I just achieved a DUF using bluetooth with a @RAKwireless 4630 custom PCB I designed.
I uploaded the firmware with my phone and I am serial monitoring using a RAK DAP in my PC.
This will allow in the future, wireless updates of firmware for animal tracking collars.
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Today I got my MSc degree diploma.
Officially MSc. In Technology, Innovation and Entrepreneurship
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I was not able to connect to my RAK 4630, but just exploring with my nRF toolbox I was able to see the hearth rate of someone wearing a @WHOOP around me. Just by accident.
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Another day of programming and debugging my PCB.
This time for GNSS purposes
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Gilberto Castro Sustaita retweeted
May 31
🏃♂️ I've gamified my own run so I can race my own ghost with the Meta Ray-Ban Display.
I built a web app for the glasses, loaded a previous GPX from Strava, and dropped game mechanics on top.
Pick up coins when you keep pace, sprint zones reward extra points if you push, and a mini leaderboard on the lens shows how you're tracking against your past self in real time.
Best part: it actually works. Seeing your ghost 20 m ahead is a way stronger nudge than any number on a watch. 😅
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RAK 4630 based custom PCB
Successfully programming using DFU and LoRa transmitting properly.
Next to check serial communications then test every module and system:
-GNSS
-RTC
-Little FS
-BLE
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Gilberto Castro Sustaita retweeted
May 30
High in the mountains of Yunnan China, getting to see some Geisha coffee trees that will be ready for harvest in November
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Installing boards configurations, mapping pins and trying to set up a new PCB.
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