ATSAMD51 Custom Bootloader

Posted under DIY, Hacks, Technology on March 7th, 2021 by

Spending the birthday playing with this beauty of a controller. ATSAMD51J19 based Adafruit Feather M4. Its a blazingly fast ARM Cortex M4(120MHz) with 512KB flash and built-in 256 bit AES crypto engines and a full USB controller from @microchipmakes. Definitely a huge performance improvement from the SAMD21 series. Real-time processing seems a breeze. Also, you can overclock this controller to 200MHz. Never heard of a microcontroller being overclocked.

Trying to build a custom bootloader for this board with a fresh chip. Seems UF2 Bootloaders from @microsoft will allow you to use it as a USB device and you can use it with Arduino and CircuitPython, MakeCode to program it with the same bootloader are a rage with this one. Reading up a lot on those. @adafruit seems to have done a great job with it. Planning a custom compilation. Anyone having experience compiling UF2 bootloader from source on Windows(https://github.com/microsoft/uf2-samdx1) do reach out. Any help is appreciated. The documentation seems to be sparse. Seems @sparkfun also has a custom bootloader for their Thing Plus series with the same controller.

Thank you again for all the warm wishes for the day. Hope you have a great day ahead.

Edit: Figure out how to do a custom bootloader. Will write a detailed blog about it soon…

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20W LED Tubelight Teardown

Posted under DIY, Repair, Teardown on February 21st, 2021 by
LED tubelight teardown
LED tubelight teardown
LED tubelight teardown
LED tubelight teardown LED strip

The circuit is mostly similar to those in LED bulbs. You have the input protection Metal Oxide Varistors (MOVs), Bridge rectifiers and a cheapo buck LED driver IC MT7844S. The LED strip consists of 100 LEDs (4 Parallel arms with 25 LEDs in series) with an open circuit voltage of around 75V. These LED strips are made on a metal-clad PCB which acts as a heatsink along with the metallic tube to dissipate the heat. The diffuser on top provides even illumination along its length.

These are pretty cheap to manufacture. Since circuitry inside is more or less the same as an LED bulb there will be huge reuse of BOM materials across products(Implying lesser costs). This is also one of the reasons why LED tube lights and LED bulbs(slightly lesser wattage) are sold more or less in the same price bracket.

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