I have been assigned a project to design a lighting circuit for a work bulding, so that when egineers enter the site the PIR activates the lights and a timer, after 30 minutes the lights either need to dim (although i understand its hard to dim modern luminares) or switch half the lights off in the room. This indicates to the engineer that they need to reactivate the sensor and resets the timer. if no one reactivates the sensor then the lights will completely switch off within 15minutes, so 45minute cycle from activation to the lights switching off.
I am struggling to actually design the circuit, if anyone could help me to complete a design and an component list. If you could identify what timer chip(s) could be used i would be most appreciative.
Thank you
I am struggling to actually design the circuit, if anyone could help me to complete a design and an component list. If you could identify what timer chip(s) could be used i would be most appreciative.
Thank you