Hello,
I have bought an Arduino box on the net, but I don't know what some components/sensors are intended to do. Could someone please help me out?
PS: I am ne to the forum, don't hesitate to modify the title/subject of the conversation, or to inform me if I'm doing anything wrong 
The second is ULN2803 or 2003 motor driver board
https://shop.edwinrobotics.com/products/623-uln2003-motor-driver-board.html
Top one looks like an I2C LCD backpack.
What are the markings on the chip?
The second is ULN2803 or 2003 motor driver board
Yes thank you, it seems to be that indeed
Top one looks like an I2C LCD backpack.
It does look like an I2C LCD backpack, thank you. On the chip, it's written: ''PCF8574AT A29468 1 03 kn{G or 6, idk}05193. Does that help you in any way?
The PCF8574 is the (a?) usual chip for a backpack.
Alright thanks. Do you know what is the use of these 2 components?
Hi,
The I2C backpack is designed to fit LCD displays like this, they have parallel input, the I2C interface makes the number of I/O needed drastically reduced.
The second is a very basic stepper motor driver, to control stepper motors.
Tom... 
Thanks a lot!
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