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From Concept to Bench - Designing a Flipper-compatible nRF24L01 RF Module for Security Research

    Six months of design iterations, sourcing headaches, and a broken oscilloscope later — I am pleased to share a hardware module I designed to extend the Flipper ecosystem for RF security research. This write-up covers the motivation, engineering challenges, capabilities, and responsible-disclosure principles behind the project — and a frank look at a vulnerability that is very much alive in the Maldives today.   Left: 3D render of final PCB     ·     Right: Altium Designer PCB layout view Why I Built It  The trigger was reading the original MouseJack disclosure by Bastille Networks. It made me realize that a class of peripherals most people assume to be harmless — the cheap wireless mouse on your desk — can be weaponized from a car park. I wanted a research platform small enough to carry in a jacket pocket, native to the Flipper Zero ecosystem, and capable of passive scanning, protocol analysis, and controlled lab tests. What I...
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Bootloading Atmega1284P Part-2


 After the the part 1 of this episode i had some weird problems with the ATmega1284p. Sometimes i am able to upload the sketch via ISP and UART side also having some issues to upload sketches and use as an serial port. So i ask some assistance from the letmakerobots.com and explained whats going on with my 1284p.
Since i boot loaded it recently, i did not have any idea of what might be the cause. Finally bajdi from LMR replied me and after few conversations with him, he mentioned that he have used 1284p lots of time and this guy built robots, controlling lots of servo from it. So my boot-loading is perfect.

When i run single servo sweep sketch the jittering and wobbling starts and stops. So i planed to take the circuit out of bread board ( which have created problems and weird interference a lot for me) and build it on copper strip board which is in the image above.
With the proper smoothing capacitors and supply it worked. I manage to upload the sketches via UART side and controlling servo was perfect. no more unknown problems.

When the servo gets crazy 

I advice people out there to use buck based voltage regulators not the crappy old 7805's. LM2596-5 is good one to make a 5v supply circuit and it monitors the output from feedback and simply saying it more like a DC to DC converter.
Special thanks to Bajdi (http://www.bajdi.com/)

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