I’ve finally got around to documenting my “mailbox alert” project. I initially started with an ESP8266, but as you’ll read, that didn’t work so well. So I dug out my trustee Imp003 and was successful. A bit overkill for an Imp003 since I only use a couple of I/O pins, but the WiFi reception is exceptional! Then, I had the issue of using normal LiPo batteries in Minnesota. I learned those will fail in cold Winter temps. So I switched to a LiFePO4 battery, which operates much better at cold temps. I’ll find out how it goes in January.
I left in all of the documentation for the ESP8266 vs Imp003 and the normal LiPo battery vs LiFePO4. It will give newbies a chance to see the similarities and differences. For those concerned about the higher cost of the Imps, remember that you are getting more than just a circuit board. Not only higher quality and performance, but the security and cloud support/IDE as well.
It seems apparent that newer imps (imp005) and such are packed with so many features and complexity. I sure hope that Imp keeps selling the less expensive and more plain Imps, like the imp003. I’m worried that beginners and tinkerers will be pushed out of the Imp world.
Here is the completed project: