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ETek Lab Blog

Category: Electronics

Simple Wall-Mount Power Switch for rPi – pt3

Part 3: Completion With the 3d print officially working, came more project advancement! I’m glad to report that the wall switch is now complete ! As a first project in fusion 360, I think it worked out ok but I will definitely need to practice further more. Going back in the design to do fixes […]

Published on September 15, 2024
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Battery-driven Bluetooth receiver for a wired headphone.

I swear, most people asked if that was a detonator… So, my phone does not have a 3.5mm jack, and my headphones are not bluetooth…. I wanted to have a semi wireless solution so, I did the most MacGyver engineering thing ever. Behold!… the thing! Basically, it’s a M28 bluetooth audio receiver for speakers that […]

Published on September 5, 2024
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Repurposed 18650 Batteries into a power station – pt1

Part 1 : Salvaging old packs Hey guys! I got another project that I started a little while ago. I want to make a power station from repurposed 18650 batteries from old laptop packs. Initially, it started with the idea of testing my old 18650s, to fill up some USB battery packs but I soon […]

Published on September 3, 2024
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Fixing a cat toy and forensic of the old part

Did somebody said… CAT?! Hey folks! I thought I’d make a quick post about this. Basically about 3 months ago I have been given an old laser cat toy thing that was working sporadically. It’s not one of these super expensive toys but still a fair 40-50$CAD. Was definitely worth an attempt to fix. I […]

Published on August 28, 2024
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OpenWRT on RTL8196E in WiFi repeater – pt2.2

Part 2.2 : Rebuilding So, since I have to do some coding in order to get the firmware out and that I can get the data without having the chip off the board, I decided to resolder everything to be sure that it was still working. It was also a good way to test my […]

Published on August 9, 2024
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OpenWRT on RTL8196E in WiFi repeater – pt2.1

Part 2.1 : The sad realization So, I’ve been fiddling with the memory chip on the WiFi repeater, thinking it was a MX25L1606E, but I got a little surprise when I closely examined the chip after desoldering it. it is NOT a chip from Macronix, I was a bit shattered… instead the chip is a […]

Published on July 28, 2024
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OpenWRT on RTL8196E in WiFi repeater – pt2

Part 2 : Unknown device So, I DID receive my new test clip to read ICs. It is quite a lovely little tool to work with and didn’t thought I’d appreciate it that much. so, YaY? Review post coming soon. Back to the WiFi repeater, it didn’t fully solve my problem of reading the chip. […]

Published on July 22, 2024
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OpenWRT on RTL8196E in WiFi repeater – pt1.1

Part 1.1 : Tool failure… So, I figured out that I would need to extract the firmware from the Flash memory. I found the tools needed (flashrom and binwalk) for the rPi and they installed great! Also found the correct pinout for the chip!… mega good news right? Indeed, It went super well for gathering […]

Published on July 9, 2024
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Simple Wall-Mount Power Switch for rPi – pt1

Part 1 : The idea So, I’ve been using a Raspberry Pi as my bench computer due to it size and that I can use the GPIOs from it. It worked great so far but the power supply that I purchased has a On/Off switch on it that is not extremely convenient. I had the […]

Published on July 8, 2024
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wifi repeater inside

OpenWRT on RTL8196E in WiFi repeater – pt1

Part 1 : Talk to me… So, I’ve been fiddling with this old device from 2013ish. it’s a WiFi repeater from an unknown brand. On the bright side, I managed to crack it open and find out the potential UART port (without pins obviously), and the chip inside seems to be a genuine Realtek RTL8196E, […]

Published on July 5, 2024
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