Post 1 made on Wednesday December 1, 2010 at 14:42 |
HiDef Fan Lurking Member |
Joined: Posts: | September 2008 7 |
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I'm an embedded product designer with over 30yrs experience and I'd like to try my hand at an affordable & expandable HA / HVAC controller. I'd like to keep the MSRP in the $200 range.
The following is a rough draft of the hardware & peripherals, if I've missed something you'd like to see added (or even discarded) please comment.
PIC18F87J60 microcontroller with Ethernet
6 Relays (2 NC/NO, 4 NO, jumpers / labels for GP or HVAC RE2-7) 4Opto Inputs with interrupts 1RS485 or RS232 (RTS / CTS could be reassigned as a SW TX / RX) 1RS485 or XBee / XBee Pro (Zigbee?) 1 SPI (RTCC with battery backup, 128k EEPROM html, ajax) 1Ethernet 10/100 1433MHz RX 1433MHz TX 1LM35 temperature sensor (freeze sensor)
The yet unnamed suggestions? controller connects to your LAN and could be controlled by anything with a web browser.
When this kit is done I plan on doing a 433 / 315MHz temperature / humidity sender to replace the traditional thermostat on your wall.
I'm trying to gather options, ideas before starting the PCB artwork.
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