How To Reset A Temptale 4
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So work occasionally throws out these temperature data loggers that according to the specs are for single use only. They use 2 different models, but here's the info on one of them. I got bored and cracked two of them open and noticed that it's just a battery with an ATMEGA, some support circuitry and a zebra strip glass LCD. If that's all that's in them, I wonder what it would take to hack them to being re-usable, and possibly as a general use thermometer (since the range appears to be -30 to 70c).
My guess is they're either doing the single-use stuff by code, or battery voltage. Sorry, no pictures of the boards at the moment, if I remember, I'll crack them open again and take a few. Awwww I have a bunch of those gizmos in my lab too. There's not much to reverse engineer inside.
Temptale 4 Interface
There's a crappy old ARM from Atmel, big 8bit cheapass MCU for handling the display, some ultra-hermeticaly sealed zncl non-rechargable battery and thats mostly it. The temperature is measured by a blobby NTC.
Temptale 4 Usb Instructions
My friend even googled out matching PC firmware for these units, but we hadn't been successful runing it, because it required some license number we weren't able to find or hack around. But I think there is nothing interesting, only if you want some basic parts and two crappy old MCUs.
Here's a hi-res photo of the similar units I have. (Hope the eevblog will upload it).
So only a small preview and here's link for the hi-res: Oh, and I forgot to mention, it is not probably soldered with the patented european ROHS solder crap, it seems it is nice lead solder on the board. Oh crap, I completely forgot I posted this. And figures, work threw out the box before I could snap some photos. Well isn't that funny, the other ones in the box were actually made by Libero. Not sure if that's the exact model, but it looks close enough.
I also forgot that modern MCU's do code protection. Which kindof sucks, but I guess that's how they make their money. Eh, what are you gonna do I guess. Maybe I'll start learning how to code with AVR and build my own one of these days. Was still interesting to see how basic these things were.