Pager-Controlled Thermostat Teardown (Work in Progress)
After installing a new furnace and thermostat, I was left with an old thermostat that was controllable by the power company to allow them to shut off the A/C remotely during high-load time, and allows users access to set their thermostat online
The Cannon Technologies Inc “ExpressStat” board (Rev M) has:
- a Renesas H8/3937 non-roaming FLEX decoder, with on-chip 60-kbyte ROM and 2-kbyte RAM,
- a Ramtron FM24CL64 “F-RAM array” (similar to an EEPROM),
- an Infrared TX/RX pair,
- a Texas Instruments TIR1000
- a pager sub-board, including pager motor and beeper/buzzer, antenna and receiver circuitry
- an 8-pin header to the thermostat’s mainboard
Attachments: