PC -> Ardurino -> several LED lamps, how to work?

Question

Arduino

Hello
I want to start something with Ardurino to do. Here I came up with such a project to start with:
Connect several light bulbs to Ardurino, pair it with a PC via Bluetooth, on which a script is running that allows you to turn on / off any of the connected light bulbs (LEDs).
There seem to be no questions on the software part, there are examples of working with Bluetooth on the network, more questions on the iron part.
Experienced people, tell me, is everything right?
In Riga, I found an ARDUINO UNO R3 CH340G for sale, and a Bluetooth adapter ( www.ashop.lv/radiotehnikas-komponentes/arduino-kom... Will I be able to do everything with this?
Does ARDUINO have any restrictions on the number of connected LEDs?If they want to connect a lot, do they use some expansion boards?
Thanks in advance for your replies!

Answer 1

An arduino, a Bluetooth module, a set of 300 ohm resistors and the cheapest LEDs are enough to test the idea.
By the way, a note on Bluetooth: the standard supply voltage of these modules is 3.3V, and arduino is 5V. Arduino can give 3.3V from the built-in stabilizer, its power is enough for Bluetooth. But for transmission lines, you need to install either a level matcher or look for a Bluetooth module that is tolerant to a voltage of 5V for input signals. Or look for a version of arduino, where the chip itself is powered by 3.3V.
Second point: once you get tired of blinking low power LEDs, you need to design power load control modules and isolate them from arduino. It is better to do this through an opto-relay (optocoupler). The module itself can be built on conventional or solid-state relays, on field-effect transistors, etc. depending on what and how you want to include this module.

Answer 2

If the LEDs are not powerful - connect through a resistor directly to the arduino output.

Answer 3

I would advise you to choose this one www.ashop.lv/radiotehnikas-komponentes/arduino-kom...
Although it is more expensive, it can be replaced if the controller fails.
In fact, the outputs of the microcontroller are rather weak and it is better to amplify them with transistors - then they can be grouped into garlands. Among other things, I advise you to look for information about each type of LED you are going to use:
www.chipdip.ru/video/id000276102
https://www.google.de/search?client=ubuntu&channel...