~~~> 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 had 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/B0140WFNYQ/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.

 

[Harald Kapp]

Look for "arduino relay shield".
You can get them with different numbers of channels. The 4-channel ones seem to be ubiquitous.

About the sensor: You realize these are motion sensors? They will not detect when you are in the room but sitting still in a chair, for example.

Examples of similar projects can be found online by looking for "automatic light using arduino and pir sensor", e.g. this one. Typically these projects work inverse to your idea: Person in room -> light on, No one present -> lights off. But that behavior can easily be inverted in software.

What would you use the timer and the fan for?