~~~> What Type of Relay?

[Silence820]

First, I would like to say I am new to electronics. But since I am stuck in the house, I thought I would give an idea I have for years a try.

I would like to build a lamp tower for my workshop and home. The way it would work, when I enter it will automatically turn off and when I leave, after a short delay it will turn on.

The parts I have up to this point are;

8 55w fluorescent lights

4 ballasts 2x54 watts Philips l-254-uni-r5n2

1 Arduino UNO
https://www.amazon.com/gp/product/B008GRTSV6/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&psc=1

1 PIR motion sensor
https://www.amazon.com/gp/product/B0140WFNYQ/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

1 Timer

https://www.amazon.com/gp/product/B075GSGH85/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

1 cooling fan
https://www.amazon.com/gp/product/B00KF7T9MI/ref=ox_sc_act_title_1?smid=A1Z5H6ZGWCMTNX&psc=1


My primary question is, what size, type, and how many relays do I need?

And would I need anything else for this project?

Any suggestion and/or advice will be greatly appreciated


Thanks.

 

[JimB]

The way it would work, when I enter it will automatically turn off and when I leave, after a short delay it will turn on.

Are you sure about that?
The way it is written, it sounds like "the lights are on, but no one is home".

JimB

 

[Silence820]

Are you sure about that?
The way it is written, it sounds like "the lights are on, but no one is home".

JimB

yes i am sure

 

[Diver300]

My suggestion would be to use a standard 120V PIR automatic lighting switch, and wire it up to a 120 V relay. Use the NC contacts of the relay, and it should do what you want.

I would use something like:- https://www.newark.com/finder/60-12-8-120-0040/relay-dpdt-250vac-10a/dp/08X7237 with a suitable socket.

You will probably want to make sure that the light from the fluorescent lights can't get to the PIR switch, or that the minimum lighting level of the PIR is turned right up. Otherwise the PIR will see the lighting levels, and never turn on, so the lights will never turn off.

I would like to know why you would want a PIR controlled light that does exactly the opposite of most PIR controlled lights.