24 VDC 2-wire photo cell
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hillbilly1
Senior Member
- Location
- North Georgia mountains
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- Owner/electrical contractor
I believe those are all three wire, I think what the OP is refering to is an "Analog light sensor" used by many energy management sytems. A seperate controller such as one Honeywell makes would be needed for stand alone operation.
Just brain storming.
We have a lighting control board built long ago by an electronic tech, he used a Schmitt trigger hex inverter IC. A 200' run of 2 cond tray cable goes to the light sensing diode on an exterior wall. I found an IC available at Newark.com, so we'll replace the bad one.
We considered the KISS (Keep it simple, stupid.) principle in the needed repair. The Crydom SS relays for switching the 9 lighting power circuits operate on 3-32 VDC, so a 24vdc power supply and a 2 wire 24vdc photo cell could have been used. (a search on the net didn't show a stand alone unit, only one part of a complete control system from Honeywell that hillbilly1 mentioned)
We have a lighting control board built long ago by an electronic tech, he used a Schmitt trigger hex inverter IC. A 200' run of 2 cond tray cable goes to the light sensing diode on an exterior wall. I found an IC available at Newark.com, so we'll replace the bad one.
We considered the KISS (Keep it simple, stupid.) principle in the needed repair. The Crydom SS relays for switching the 9 lighting power circuits operate on 3-32 VDC, so a 24vdc power supply and a 2 wire 24vdc photo cell could have been used. (a search on the net didn't show a stand alone unit, only one part of a complete control system from Honeywell that hillbilly1 mentioned)
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