Hello everyone,
I am designing a commercial staircase lighting controller.
I need a verified retriggerable timer circuit using the RCWL-0516 microwave motion sensor.
Requirements:
Supply voltage: 12V DC
Input: RCWL-0516 (3.3V output)
Output: 12V LED strip (through MOSFET or relay)
LED should stay ON for 30–60 seconds after motion is detected.
If motion is detected again before the timer expires, the timer should restart (retrigger).
No Arduino, ESP32, or microcontroller.
I need a reliable, tested schematic suitable for a commercial product.
If possible, please provide the complete schematic and component values.
Thank you.

 

Hi,
Welcome to AAC.
As You are designing the light, please post your best attempt of the design, we can then help.

E

 

Use CD14538 or MC14538 dual retriggerable monostable multivibrator. You only need to use one section. Make sure that the inputs of the unused section are tied to valid logic levels. Do not leave them floating.

 

I recall a previous thread on the similar topic several months ago. I did not follow it.
For a commercial product of commercial quality and reliability, that sort of design may not be "free". This design has been requested at least once before. The difference between a good hobby class design and a commercially viable design may be quitea bit.

 

Sounds like you are wanting a bunch of strangers on the Internet to do the job that you are getting paid to do, but do it for free.

 

There are quite a few portions of the specofication missing! Package size, and the terminations connctions, for starters. Also, is the thing supposed to include mounting for any light source? Or for the power supply?? What safety certifications should it satisfy?? AND, Also, should if have the time be adjustable?? Should it have a "latch on" function for when the steps are to be cleaned, or serviced??
Most important: should it be able to be triggered by an outside fire-alarm warning signal?? THAT is a requirement for any lighting control system in a public building.
OR, does the TS simply want a circuit, not an actual product system design???

 

There are quite a few portions of the specofication missing! Package size, and the terminations connctions, for starters. Also, is the thing supposed to include mounting for any light source? Or for the power supply?? What safety certifications should it satisfy?? AND, Also, should if have the time be adjustable?? Should it have a "latch on" function for when the steps are to be cleaned, or serviced??
Most important: should it be able to be triggered by an outside fire-alarm warning signal?? THAT is a requirement for any lighting control system in a public building.
OR, does the TS simply want a circuit, not an actual product system design???

The specification is missing a lot of key details before a proper design can be suggested. Things like package size, connections, power supply, mounting, safety certifications, timer adjustment, and service/latch functions all need to be defined.

The biggest question is whether this is meant to be a complete lighting control product or just a circuit design. If it’s for a public building, fire alarm integration and safety requirements also need to be considered.

 

Two transistors (remember them?)

This meets 100% of the requirements in post #1. Note that the FETs are part numbers pulled at random from the design library, not specific component recommendations. R and C values might vary.

ak



No 555's, uC's, or SOC's were harmed in the creation of this design.