Penguinitis Tech
19.04.202516:52
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28.03.202514:57
I was looking for a connectivity solution for the handheld-freebsd project, but end up making a prototype PCB for a Smartwatch!
Since we are designing a general-purpose FreeBSD-based handheld/mobile device I think the only valid solution for radio here would be a cellular technology.
The main options here are LTE/4G and NR/5G.
LTE/4G is still a greater availability and value compare to NR/5G.
Decided to focus on LTE-M, which is a subset of LTE designed for machine-to-machine communications. It offers lesser power consumption, better penetration through walls and longer range. It does support handover as usual.
While the LTE offers much higher speeds (up to 100mbit/s), the LTE-M is just 1 mbit/s. — Should probably be enough for everything on FreeBSD!
My cellular experience is limited to Nordic nRF9160, which is a dual ARM Cortex A33 SoC. One core of this SoC is reserved for the 4G radio, another is available for your application entirely. The SoC also supports GPS.
What I discovered recently is availability of newer Nordic nRF9151 chip, which is 20% less footprint and 45% less power consumption compare to nrf9160.
Cost-wise is around 16GBP per SoC, plus VAT.
I could have embedded this nRF9151 into the stm32 project straight away, but to save cost on evaluation decided to come up with a separate project. This should allow us to keep the Bill of Materials (BOM) at minimum for evaluation.
So here is a quick Smartwatch PCB based on nRF9151. It has a SIM card slot, display connector and PCB antenna.
It also have a footprints for the matching network. So the main trouble here is to match impedance of antenna and PCB. We have to build a network of capacitors/inductors to create a match.
Unfortunately, I don't have much of equipment for analyzing radio field or measure impedance. Will see what we can do... may be just a simulation could help!
Since we are designing a general-purpose FreeBSD-based handheld/mobile device I think the only valid solution for radio here would be a cellular technology.
The main options here are LTE/4G and NR/5G.
LTE/4G is still a greater availability and value compare to NR/5G.
Decided to focus on LTE-M, which is a subset of LTE designed for machine-to-machine communications. It offers lesser power consumption, better penetration through walls and longer range. It does support handover as usual.
While the LTE offers much higher speeds (up to 100mbit/s), the LTE-M is just 1 mbit/s. — Should probably be enough for everything on FreeBSD!
My cellular experience is limited to Nordic nRF9160, which is a dual ARM Cortex A33 SoC. One core of this SoC is reserved for the 4G radio, another is available for your application entirely. The SoC also supports GPS.
What I discovered recently is availability of newer Nordic nRF9151 chip, which is 20% less footprint and 45% less power consumption compare to nrf9160.
Cost-wise is around 16GBP per SoC, plus VAT.
I could have embedded this nRF9151 into the stm32 project straight away, but to save cost on evaluation decided to come up with a separate project. This should allow us to keep the Bill of Materials (BOM) at minimum for evaluation.
So here is a quick Smartwatch PCB based on nRF9151. It has a SIM card slot, display connector and PCB antenna.
It also have a footprints for the matching network. So the main trouble here is to match impedance of antenna and PCB. We have to build a network of capacitors/inductors to create a match.
Unfortunately, I don't have much of equipment for analyzing radio field or measure impedance. Will see what we can do... may be just a simulation could help!
01.04.202523:29
post.reposted:
vx-underground
29.03.202515:29
Today Microsoft announced Windows 11 will require a Microsoft account to create a local profile on the computer. They will be removing the bypass option available in the installation command prompt.
There will still be workarounds, but they're making it harder
There will still be workarounds, but they're making it harder
29.03.202513:44
post.reposted:vx-underground
29.03.202500:34
Threat Actors trying to figure out what kind of piece of shit they're targeting (it's using PowerPC architecture, 256kb of RAM, and 12mb of harddrive storage)
18.04.202521:16
post.reposted:vx-underground
29.03.202522:30
People online are expressing frustration toward VMware. They are deeply unhappy with the recent licensing changes.
29.03.202514:25
post.reposted:
Enderman
28.03.202521:24
🤦♂️ It keeps happening
Microsoft are redesigning the BSOD to show less information and removing
If you take your time to read the blog post, the gaslighting in it is so shameless.
Microsoft are redesigning the BSOD to show less information and removing
oobe\bypassnro.cmd «to enhance security and user experience of Windows 11».If you take your time to read the blog post, the gaslighting in it is so shameless.
28.03.202514:09
18.04.202512:48
this is funny
29.03.202520:57
post.reposted:vx-underground
29.03.202509:54
>check internet
>see rust nerds
>rust nerd says: "rust is faster than pure asm"
mfw rust is its own instruction set now and supersedes the entire x64 architecture and the hardware it was designed to operate on
>see rust nerds
>rust nerd says: "rust is faster than pure asm"
mfw rust is its own instruction set now and supersedes the entire x64 architecture and the hardware it was designed to operate on
post.reposted:vx-underground
28.03.202516:54
It's fun memeing nerds for hacking websites.
It's funnier because we couldn't hack a website if our lives depended on it because we've spent our entire lives screaming into the void of Windows internals
It's funnier because we couldn't hack a website if our lives depended on it because we've spent our entire lives screaming into the void of Windows internals
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