PASS

I just changed the name from Humidos to PASS (personal ambient space sensor).

It is a better descriptor for this project.

I added a picture of the schematic to project details, but if you like this project grab a copy from UpVerter.

The next step is the battery and packaging design.

In the vid I show the board taking readings from all the sensors and displaying them the screen.

I first added my newly burned ATMEGA328 and programmed it. Then I added the pressure sensor.

The pressure sensor has solder pads under the chip! yikes! I used solder paste and a toaster oven.

I needed to reflow the solder because the first time the BMP180 did not fully seat, so I re-heated the board removed the chip, cleaned the board, added more solder past and reflowed the chip - ah much better.

Learn upverter - easy to learn and use and over the past month they have been updating the software and adding some nice features that EagleCad does not have like toggle layers on/off - show only top or bottom layer.

I ordered my completed board from upverter and they used OSH Park. I ordered 2 for about $23 and recieved the boards in about 2 weeks 1  week before I exprected it. Also, I got 3 boards one as a bonus.

This is my bread board to burn bootloaders on to ATMEGA328's.

I can quickly burn my own Arduinos!

Using Optiboot https://code.google.com/p/optiboot/ make this task easy.

Step 1. load the Optiboot sketch on to an arduino - on reset the program searches for one of four different target chips and automatically starts to write the bootloader - done! 

The circuit is on upverter. https://upverter.com/donsmrkatz/1b5793121c45bbf0/ProgramConnector/

Learn upverter - I like the idea of free tools and upverter is right tool for this project. They have an integrated BOM which is a big plus.

Learn how to burn a boot loader onto an ATMEGA328.

How to log humidity, air pressure and temperture using low power (sleep mode), battery backup and real time clock. I will be using sleep mode and reset.