I’m working on a new revision of the temperature logger: new PCB and new firmware. It’s easier to solder, as the resistors/caps are now 0603 instead of 0402 and the PIC package is now a SSOP28 (instead of QFN).
The sleep current is smaller than 10uA and below 1mA when measuring the temperature (plus a few mA every 20-or-so logs, when writing to EEPROM).
The EEPROM is a SST25WF080 (still 1,8V 8Mb), as the previous Atmel memory is not available any more.
Some 3D renderings of the PCB:
The USB connector is a Multicomp MC32604, cheaper than the previous MCKUSBX-SMT2AP1S-W30. (I couldn’t find a suitable 3D model for the PCB rendering)
The ISCP connector for programming the firmware is SMT but fits the Microchip’s ICD header:
Now, to complete the firmware, I have to build at least one logger, which means ordering the PCB and the components. That’s why I added a “donate” button to this blog (on the top right side of the page, just under the title), especially I don’t earn any money with this blog and content is free (and will stay free, of course).
If my work helped you, if you find it interesting, if you want more articles and more projects, dropping a few coins will motivate me and help me to materialize all the projects waiting in my head. 🙂
Stay tuned for more!