Relay control
Parallel port relay controller

LM34 - Temp sensor PDF doc
LM34CZ temp sensor, range -40F to +230F
LM34DZ temp sensor, range +32F to +212F
Using a LM34 with JAuto

Horizontal float switch
Vertical float switch

Telaire - Wall mount C02 monitors
Using a C02 monitor with JAuto

Acrosser - B2102 Relay controller
Acrosser - B3001 Sensor controller

Grainger - Parts supplier
Allied Electric - Parts supplier
Jameco - Electronics supplier

Eclipse programming environment
IBM Systems Journal
PC Parallel Port Central