@floris, you have to adjust the sensitivity of the rain sensor. I splashed some water on the sensor pad and used a small screwdriver to adjust the potentiometer on the interface board until it triggered to my satisfaction. It took a few iterations to get it to trigger at the level I was looking for.

@AWI, that's OK, our iPhones are so reliable (or should I say "expensive") that we don't get to collect them like Andriods.

@Totche, the original 3v7, 1000mAh lion battery is tucked under the circuit board. You can see the arch of the plastic cover toward the bottom of the picture on the left, just below the DHT22. It is connected to the circuit with the black and red wired connector so it can easily be removed when working with the device.

@floris, Yes, those are the pins I used. The BMP085 is also I2C, using the same pins as the lux sensor.

@floris, Thank you for your kind words. The luxmeter faces down, so the light is indirectly collected through the diffuser. If I were to build V2.0, I would look into adding a light pipe to provide more direct lighting on the sensor.

One thing to keep in mind as you conceptualize this is packaging. For each option you provide (type of radio, style of radio, w/wo Ethernet, etc.) you complicate the design of the enclosure. When we build our own boards, we think of that as we do the layout. When you "hard code" the layout, but add several if-checks in the process, you should remember those of us who don't yet have a fancy 3-D printer. We still need to shoehorn the board into an available box.

I've experience close to that before. I've built circuits where the radio continued to draw as much current in sleep mode as when awake. It worked fine, but it wouldn't take a nap. Swapping out the radio solved the problem. That radio is now in a wall wart powered device. I haven't seen one change like that, but I'm sure it's possible.

Be very careful. You'll get hooked on this stuff like we are and you'll have sensors and controllers all over the place. It never ends. We can't stop ourselves. You will dream up new circuits in your sleep. Ouch, that soldering iron is hot! There's always something being shipped from China. What am I going to do with the other 99 diodes in that little bag? That rosin smells different than the last roll of solder. Gee, I need one of those fancy bench multi-meters. Aww smack, I dropped that screw again! Yes dear, I'll have dinner ready once I finish this sketch. You'll go to bed and then ask yourself if you turned the soldering iron off. Be careful. You've been warned.

When you apply voltage to the RAW pin, do you get 5v out of Vcc?

i did notice in the AliExpress page for your battery, the illustration has 10,000 mah. The title must be a typo.