Here’s a fun little project…
The result is a geeky little indoor environmental monitoring station:
Couple of notes here:
- I took the lazy way out and merely display the info as text, graphics would be so much nicer!
- Both sensors can read the temperature, but as you can see, they don’t fully agree…
- I added the FTDI hookup and used it to power this thing via an AA Power Board.
- The AA board does double duty, as a little stand to hold this thing slanted upwards.
Adding FTDI was very useful in this case, since it also makes it possible to re-program the JeeSMD, which has no FTDI connector on board. All it needs is a 0.1 µF cap and the 6-pin header:
But there’s more to it than that, alas: to be able to upload to the JeeSMD, you need to hook up all the headers on the JeeSMD, i.e. also the PSI and the SPI/ISP headers. Adding those after the fact is very tricky, since you can’t reach the back of the Graphics Board pcb anymore if you soldered the LCD on permanently – as I did.
I had to solder the female headers slightly higher, to just barely reach the pins from the top with a very fine soldering iron tip (I use 0.4 mm). It worked, but as a result, the JeeSMD sits a bit higher on its pins than usual:
Here’s the indoor.pde sketch, also added to the Ports library: