I used for the purpose of a project of operating motors in a 9v battery, the motors did not work even though the connections are normal, I realized that I have to use a higher input voltage, but power supplies of 12 volts usually with a port that is not suitable for wire input to module L298. Which 12 volt power supply can connect to the inputs of the L298 module? Can I recommend something like this?
מתבצע עיבוד: IMG_20210823_184003.jpg…
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What L298 driver? There are many different manufacturers of that ancient piece of crap.
What sort of "port" is suitable for connection to the driver? Usually it is just a stripped wire that goes into the barrier terminal strip.
Is it now possible to see the image? I drag and that's what it is ..
In all the projects I see that they use a 9v battery and it turns out that it worked beautifully for them. Why in my battery like this do the engines refuse to move? These are classic small dc engines. I measured at the ports of the driver and there is a voltage of 5.6v Is there a reason that at such a voltage the motor will not work?
The photo shows just fine. You did good.
There is a lot of bad information on the Internet. The use of those smoke alarm batteries for anything but smoke alarms is a great example. It takes voltage and sufficient current to run a motor. Those batteries do have 9V, but their current capabilities are very low. If they work at all it is for a short time. This forum has literally hundreds, if not thousands, of examples of how poor they are for Arduino projects.
That crappy ancient and inefficient L298 motor driver does not help the situation.
Well then what is the recommended power source for a sample build of a Bluetooth based car with such a motor controller without connection to a stationary power source?
thank you for the quick reply!
And which module should you use for a Bluetooth-based vehicle project to control engines?
I know nothing about your motors so can not, intelligently, recommend any driver. Pololu has a great line of modern and efficient motor drivers. Pololu has good instructional pages for each of their products. Choose a driver based on the motor supply voltage and the stall current. The stall current should be listed on the motor data sheet.
The same applies to the battery. I do not know enough to just say, get this battery. You need to analyze the system to see what voltage and amp hour capacity that you need. How much average current over time does the car use? How long between battery charges/changes? What voltage(s) are required?
All RC car models use LiPo or LiFePO4 or NiMH packs for power. They are able to provide high current (small 9V batteries cannot - except for the new rechargables ones which are LiPo inside).
Can you recommend me such a specific one at a non-exorbitant price? But one that will also work .. I would be grateful!
Still do not know the answers to the questions about the battery requirements in reply #8.
Without knowing anything about the motors and the endurance you want, no idea.
Okay let's start from the beginning, here are the components I have to power a Bluetooth based vehicle:
The data of the dc engines: (I bought at AliExpress, this is the data that is there and only ..)
Regarding the motor controller these are the data:
The battery is a simple 9 volt battery
My question is is it understandable why the motor controller fails to run the motors? (Not even one).
My question may be funny but I do not understand much in matching the data to the project and therefore ask for your help.
If it is not possible to start the engines with the equipment I have, what changes must I
? make in order to start my engines
And again strange to me because in all the projects I saw used exactly the same equipment and it seems that all the engines worked beautifully... 
Do the motors run from two AA batteries (3V)? If so what stall current do they take?
The L298 wastes 2.5V or more and is unsuitable for low voltage use. You'd ideally want 9..12V motor, 12V supply and L298 if you want it to work. Modern MOSFET motor drivers are way more performant.
That battery isn't going to cut it, standard PP3 sized 9V batteries are for low current devices. These days there are some that have LiPo internally and are high current (but are actually 7.4V, not 9V). What's likely happening with the battery is the stall current demand of the motor pulls its voltage down to a few volts and the L298 gets insufficient voltage to work.
Even tiny motors tend to need at least 1A, its best to characterise the motors first.
Probably not. Don't believe everything you see on the web, especially if they recommend using 9V smoke alarm batteries for anything.
This low voltage brushed DC motor driver from Pololu is vastly more efficient than the L298 and will probably work well with the pictured motors. A 4XAA or AAA battery pack should be suitable.
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