Alice Averlong🏳️⚧️Opened up a random microsoft keypad. It has no names on it, which I hate.
but if you open the battery compartment, which requires a screwdriver, there's a label in here. Model 1558, FCC ID C3K1558.
opening the back, it's got one little PCB, and that's all.
The membrane to the front is held on with ultrasonic welding
The membrane to the front is held on with ultrasonic welding
The PCB is pretty simple. It's got a built in antanna, a couple mosfets, and two chips.
u2 is a 6-pin chip with the label "RAR" on it. Probably something voltage related, given the position.
The main chip is an nRF24LE1 from Nordic Semiconductor.
It's a microcontroller with 16 kilobytes of flash, 1 kilobyte of RAM, another 1.5 kilobytes of NVRAM, and it does 2.4 GHz wireless.
AND PUNCH OUT ANOTHER ENTRY ON YOUR CARD, IT'S AN 8051!
Cyber Yuki@foone What's with all these secretly coded chips that are actually 8051s? Is it something like "The first rule about the 8051 club is you don't talk about the 8051 club" or something?
I mean, what's the rationale?
@yuki2501 I'm not really sure. I guess it's just a widely available cheap chip design, and there are plenty of already-existing tools for it.
@foone No I mean why not add the 8051 label to it, like why hide it beneath layers of obscure documentation and proprietary chip references?
Nina Kalinina