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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Hardware Development’ Category

GL-AR300M – GL.iNet: nice small device allowing NAT over WAN, WiFi, 3G/4G modem, or OpenVPN

Posted by jpluimers on 2020/08/28

Still glad I got a few of [WayBack] GL-AR300M – GL.iNet: it makes travel life so much easier when you cannot use tethering.

I got the model GL-AR300M with external antennas (the GL-AR300M only has internal ones with a much shorter range).

Powered over USB, it runs OpenWRT and can NAT a local network towards an external network on the WAN, WiFi or (via USB) 3G/4G modem.

Despite doing only 2.4Ghz, it was a life saver in many occasions (there is a 5Ghz model, but it has over heating issues).

It can even run as an OpenVPN client, but given the hardware it is limited to about 10 Mhz (and gets quite warm).

Over USB, you can access web-cams, hard-disk, and more.

The internal LAN is a life saver when for instance you hook it to a stack of Raspberry Pi devices.

Docs at [WayBack] GL-AR300M – GLI Docs

I’m not the only one happy with it:

Below are some videos with config tips and reviews.


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Posted in Development, Ethernet, Hardware Development, LifeHacker, Network-and-equipment, Power User, Raspberry Pi, VPN, WiFi | Leave a Comment »

DIY electronic RFID Door Lock with Battery Backup – CodeProject

Posted by jpluimers on 2020/08/26

On my list: check if Mifare Desfire cards are still secure enough for something like a [WayBackDIY electronic RFID Door Lock with Battery Backup – CodeProject.

Via: [WayBack] Lots of interesting info on RFID use. – Lars Fosdal – Google+


Posted in Development, Hardware Development, LifeHacker, Power User, Security | Leave a Comment »

Using LEDs as mains indicator lights on 120V and 230V (live demos) – YouTube

Posted by jpluimers on 2020/07/28

I love the “bigclive” YouToube channel: it is full of neat ideas, and wise tips on disassembled electrical gadgets. Most of his videos involve soldering or/and making schematics of the things he tears apart or builds.

This one is on Using LEDS as mains indicator lights on 120V and 230V (live demos):

Modern LEDs are bright enough at low current to use as directly mains powered indicators with minimal circuitry. The slight downside is that with a simple resistor circuit the vast majority of the power gets wasted as heat. But the current is so low anyway that it doesn’t really matter. Here are some simple ways to drive LEDs from 110V to 240V with minimal circuitry. I tend to recommend running resistors at around half their rating at worst as it means they will last a long time and not discolour too much with age.

His [WayBack] web-site is very small and shows some of his projects.

You can follow him on either youTube or on the the BigCliveDotCom reddit channel.


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Posted in Development, Hardware Development | Leave a Comment »


Posted by jpluimers on 2020/07/16

Below is a cool site that I do not just list because I like the site, but also that they have a solar powered server running a low-tech version of it.


Doubts on progress and technology

It actually started as a Dutch site, is ran by a Belgian now living in Barcelona. This means many articles are available in various languages, not just English and Dutch, but many also in French, German, Spanish, and Italian. Some articles are only available in English or Dutch.

Via: [WayBack] The last c’t Magazin +c’t magazin mentioned and I have already spent hours reading various articles there … – Thomas Mueller (dummzeuch) – Google+

Here are some more links.



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Posted in Development, Hardware Development, LifeHacker, Power User, Solar Power | Leave a Comment »

Remote power control your IoT hardware and remote updating boot SD cards

Posted by jpluimers on 2020/07/16

Thomas Rini (of U-Boot and Yocto fame) mentioned these solutions for remote power control of IoT devices and remote updating SD cards in this slide State of the U-Boot – Thomas Rini, Konsulko Group:

Two power solutions I like myself are:

The combination of these allows for really flexible production and testing environments.

Slides at [WayBackELC2017 – State of the U-Boot.pdf


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Posted in Arduino, Development, ESP8266, ESP8266X, Hardware Development, Hardware Interfacing, IoT Internet of Things, Network-and-equipment, Odroid, Power User, Raspberry Pi | Leave a Comment »

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