I want to try and make a "Driver alertness detection system" which uses a machine learning algorithm in Python that detects if the person looking at a camera is "drowsy" or "alert" and it will display the status message on the LCD screen of the arduino. I will use my laptop camera for that. I wanted to add a vibration so that it can "alert" the driver if it detects theyre sleepy. Basically thats the entire project. My alternative is a flashing LED bulb if I cant use a DC motor. It doesnt need to be on all the time or anything, just when I want to present the project. Is it possible to fit all the neccessary components into his setup (9V battery)? I only have a DC motor and a servo motor but I think a DC motor will be better for my use case. Thanks.
No.
A 9 volt battery doesn't run motors.
You are likely looking for this:
https://aliexpress.com/item/1005005298184969.html
Have automobiles become so comfortable one needs to create an annoyance to stay focused? Drive a 1979 Land Rover III, thumbs in.
Power the vibrator with the power supply, not the Arduino.
Please provide an annotated schematic for us to work from.
Is this actually working with acceptably high accuracy? If not, that is the important challenge.
As long as you use an adequate power supply as advised, almost any small DC motor could deliver vibration by adding an improvised off-centre weight to its spindle. (One mounted under the pillow of a friend's deaf daughter made a reliable alarm for years). But even TESLAs don't come with pillows or similar, so finding a suitable mounting position...?
A loud buzzer would be my choice.