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Well, I eliminated the Pi Zero, in favor of the Esp12-e because of the price. The Zero requires a Wifi dongle, microUSB adapter, SD memory and a fairly clean power supply. The ESP12-e has WiFi integrated, internal memory- and it only cost $2.10 per unit. I renamed the Charlotte- now, it's "Charlette". 2 Form C relays, (8) 0-3.3Vdc analog inputs, switching regulator (those linear regulators ran too hot). I suppose I should post another project. I love designing and making these PC boards!
I designed a nice little PC board for the Esp12-e- here it is. If anyone wants the CAD files, -let me know. I have 7 circuits designed specifically for Esp12-e and IoT Home Automation-
sure you can!
y'all should check out the http://www.itead.cc/sonoff-wifi-wireless-switch.ht...It can be hacked pretty easily- and it a great IoT WiFi switch!
or use http://www.microchip.com/wwwproducts/en/MCP23S17on an ESP12-e. All the GPIO you could ask for!
Ah....better use a correctly rated relay on 20Amp mains. I prefer the Panasonic ALE http://www.alliedelec.com/images/products/Small/70617938.jpg
Mounted inside a standard electrical single-gang (deep) plastic blue box. I haven't engineered the case yet, but it will be just about the dimentions shown, perhaps a bit thinner in production because of the GPIO connector trhickness.
-and of course I'm updating the piwifio.com/charlotteweb.html all the time, particularly the .pcb file. Making it better all the time! ;)Latest upgrade: Using LM-SR5 voltage regulator. It's a 5Vdc @ 1.5A SWITCHING regulator. Input voltage is now safely +7.5Vdc to +24Vdc! Awesome!
CharlottePi I/OView Instructable »
http://piwifio.com/MakingCharlottePi.mp4|I want to hear from ya!My "concept" is full duplex- not just 1 way!AND, (2) of the inputs monitor the condition of the 2 relays! ;)