I wants to convert my old hot tub controller, wich is currently using relays, to more reliable TTL gates (solid state) and opto-isolators. Design and build a logic circuit thatl will replace the control function of the relay controller. The all solid-state circuitry would have to operate the following functions:
Switch Input #1-Main Power Switch Input #2-Underwater Light Switch Input #3-Circulator Pump Switch Input #4-Jet Pump Switch Input #5-Heat Demand Signal (thermostat)
Nothing may operate until switch #1 is activated (main power).
The light swithch (#2)may then be switched on or off independently after the main power switch is on. However, they may not operate at the same time. If one has been previously turned on, the other will not operate. The first motor function to occure will have priority.
If switch #5 (heat demand) is activated, water must be moving through the system, therefore if the water is stagnant, the circulator must start automatically. If the circulator or jet pump is already running when the heat demand is activated, no other function needs to take place. Please reply via usenet. My header is a spam trap