Well I need a new past time, guitar, photography and living is not keeping me awake at night. So I thought I should connect my air conditioner on my local network. This is a simple project from the hardware point of view, the hard part will be the logic. The first step is listing my Inputs/Outputs, with this list I’ll be able to choose my micro-controller.

Inputs (10):

• Room Temperature
• Pipe Temperature
• Wet Sensor (Humidity)
• Microswitch (x4)
• Pressure Switch (Normal Level)
• Pressure Switch (Security Level)
• Infrared Sensor

Outputs (9+):

• Display Unit (Unknown Number of lines)
• Motors (Utility x2)
• Drain Pump
• Circ Pump
• Upside Fan Motor (3 speed)
• Bottom Fan Motor
• Compressor (External Protector)

I was able to get all this because I opened my AC:

Fun, they mixed 115v AC with 3.3v DC on the same board; what could go wrong ?

Basically the choses I have, for my controller, are:

• EmbeddedARM TS 7260 (30 total DIO pins)
• CM-HSC12NE64: Based on Freescale MC9S12NE64 Microcontroller (Development board has more then 10 output lines and 12 input lines)
• FoxLX (48 general purpose I/O)

The MC9S12NE64 is very nice since it is the only one that will fit in the current enclosure however it is a bit short on inputs/outputs.