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Picture of Ice Cube-Unread Email Counter
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Digging into the vault of never fully documented projects, I found this and decided to make an Instructable on it. Doing this mostly by memory, I might have missed some things. Let me know if you see any errors. This is a project that displays how many unread email messages you have. It also displays the temperature. It wirelessly transmits your unread message count to a small acrylic cube. There is a piezo transducer on the lid of the box that allows you to switch between temperature and email by tapping on the lid. If you could vote for me in the epilog and battery powered contests, that would be great!
 
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Step 1: Transmitter Electronics

Picture of Transmitter Electronics
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The transmitter is basically a FT232RL USB to UART bridge and the RCT-418-AS transmitter. The UART signal from the FT232 must be inverted before going to the transmitter because the UART  "no data" state is high. If a high signal were going to the transmitter constantly, it would violate FCC rules because the RCT-418 would be transmitting constantly. This circuit is powered directly off the USB port of your computer. For correct VSWR the antenna MUST be 17cm. This is a 1/4 wavelength antenna for 418MHz.
husamwadi2 years ago
How did you know how to do all that?

When did you sit down and say, I want to transmit a wireless email count using an atmega328?

This is really phenomenal, good work lol
mickeypop2 years ago
For the acrylic cement you might want to look up a plastic supply in your area.

Weld-On #4 is made just for acrylics, fantastic and fairly cheap.     

Acetone works but has no filler and your mating surfaces need to be a really tight fit for a good hold.

You can however mix a bit of acrylic dust from sanding with acetone and you have your filler. 
Mix it in a glass jar NOT plastic and cover it for just a bit till the dust to dissolves, than apply.
WWC2 years ago
What did you use for glue. I have made something similar but the glue i used didn't hold very long.
trumpkin (author)  WWC2 years ago
I know that you can get special acrylic solvent that essentially melts two pieces together, but I just used super glue, and it seems to hold just fine.
Zerlin trumpkin2 years ago
Chloroform is what is used to weld acrylic. Not sure if you can just drop by your local drug store and pick up a bottle though.
Nice!