Sensor for illuminated house sign

[JohnD]

So the reason for the needless complexity is because tinkering with a soldering iron is a hobby and it gives you something to do.

 

[bernardgreen]

but what has that got to do with what we are discussing?

The sensor will have a fan out value. Maybe not specified as so many standard TTL loads but as maximum sink or source current and the voltage drop across the output device when the sensor is supplying that current.

It is not uncommon to find sensors or timers being over loaded by having too many loads ( often too many relay coils ) connnected to their outputs.

 

[JohnW2]

but what has that got to do with what we are discussing?

The sensor will have a fan out value. Maybe not specified as so many standard TTL loads but as maximum sink or source current and the voltage drop across the output device when the sensor is supplying that current. ... It is not uncommon to find sensors or timers being over loaded by having too many loads ( often too many relay coils ) connnected to their outputs.

We were talking about 2 or 3 sensor inputs (each sensor being connected to just one input) and one (relay) output.

Kind Regards, John

 

[ban-all-sheds]

So the reason for the needless complexity is because tinkering with a soldering iron is a hobby and it gives you something to do.

It's not something which is compulsory for others to do. I can see the sense in a system which decides whether a light should be on, and for how long, on the basis of ambient light level, time and date, and PIR detector, so the basic concept is not necessarily needless complexity.

Building your own control logic out of 7400/4000 series ICs might be seen as that by some, as might writing code for a Raspberry Pi, or Arduino for example.

And as might building your own chest of drawers starting with rough sawn timber, rather than just buying one from a furniture shop.