I have attached a picture of the schematic from his project, all I did was solder two wires coming out of the power source and had them both entering the 12V+ input on both the L298n H-bridges. Secondly, I wrote the code to include the pins for the 2nd L298n. I don't believe the code or the app are the problem.
What is the spec for the power supply you are currently using ?
What type motors are you using (spec) ?
Are you using a bare L293 or a module of some description ?
Not sure of the Logic level Convertor as the Arduino should be capable of talking directly to the BT module ?
Z-hut mentioned in his video that the HC-05 runs on 5v but its logiv runs on 3.3V. So I have the logic level converter set-up exactly how he does and all my voltage is the amount it should be other than when I slide the sliders on the app, The max voltage I get is .4V. Something seems off.
I have had 12 volt cheap PSU's that were under rated in current that almost dropped off the meter for voltage when a load was applied.
That's why I asked for the actual spec of the PSU.
The motor does not seem to have an actual spec from the link so I cannot tell how much current it would take at load.
Are there any numbers on the motors themselves ?
So you have four L298 or two ?
They have a max current rating but if you are using the modules you linked to they may be OK.
I have a similar module running a geared 12 volt motor turning 5KG of stones in a rock tumbler but my PSU is 12 volts 10 A so more than enough to handle the current.
SPECIFICATION
Type Gear Motor
Protect Feature Totally Enclosed
Brand Name BRINGSMART
Construction Permanent Magnet
Continuous Current(A) 750MA (additional specs say 1 amp so that would mean your supply has to be at least 4 amp with some extra as a margin for best operation.)
Usage Home Appliance
Model Number JGA25-371 With Encoder Motor
Commutation Brush
Efficiency IE 1
Certification CCC,UL,ROHS,ce
Output Power 4W
Torque 0.5-8KG.CM
Usage Micro dc motors for toys, DIY motor
Speed(RPM) 18-1930RPM, choose one speed (gearing dependant)
Voltage(V) 12V
Encoder 3.3-5v Hall
Signal feedback A circle of 11 signals
Diameter of whole wheel 65mm
Diameter of motor shaft 4mm
That would indicate you are operating the drivers at almost max spec.
Power supply unit? I have been running 12V out of it. also, When I put the sliders to max power, the motor outputs ~11V
Anyways the front 2 motors worked fine, however the back 2 motors were only getting .4V. Maybe it was a bad L298n h-bridge motor driver. I have an extra that I am hooking up right now. does this seem like it could be a bad H-bridge? or is it something deeper than that. I figured if one of the H-bridges worked perfectly and the other not so much. Maybe I blew it up several projects ago?
ok, but if the schematic is correct and the motors on one H-bridge work, but not the other, am i wrong to assume the H-bridge was shot from a different project? or I wired something incorrectly?
IDK why PSU specs matter in this case. Because my front two motors each get 11V max but my back 2 arent getting any.
If you dont understand why current is as important as voltage you might want to read up on a few electrical basics...
Lets say you have a 1 amp 12 volt motor and try to run it with a 500mA 12 volt supply...You will be very lucky is the motor turns...If it does you may see it turn slower than you expect...It may also rapidly seem to stall...If you are unlucky it may even cause the PSU to overheat and fail (possibly with nasty consequences).
If you want to call yourself "engineer" you may want to revise that to "wannabe engineer" until you know a little more about electricity as a whole.
There are plenty of tutorials on the topic of AMPS and CURRENT.
Even a few minutes will give you some knowledge.
I am not at your location so from here it is impossible to tell what you may or may not have done wrong.
A clue here is you have a 12 volt supply yet you are only seeing 11 volts which suggests a voltage drop.
Quite possibly due to a current related factor nothing we can see without details of your PSU...
I can legitimately use the term engineer in a couple of fields BTW.
I'm just learning electrical engineering. I'm more of a mechanical guy. Sorry...
However, my first H-bridge works great. When I disconnect my first H-bridge and just try the rear motors, it is not so great. I think someone may be wrong with my code, app, or schematic.
Knowing the limits and specifications for each componenet / board in your design and understanding them a little more would help you rule out certain aspects or upgrade some areas.
One of the biggest issues many people new to Arduino face in not realising that some of the designs out there may have thier own issues.
Just because somebody posted a circuit they got to work does not always mean it will work for other's trying the same thing.
That's where all the extra detail people get asked for comes into play.
Some exceptional people hang around these forums so if they ask for a particular detail then you can almost certainly be guaranteed that it is crucial to the whole project.
You would not question the need for specific grade bolts in structural engineering if they were called for in certain points. Same applies with electronics.
Already said I think you may be approaching the limits on a couple of parts but without that final detail that you have yet to supply I cannot do much more.
Another fairly key skill for any kind of engineer (or even an inmate of an educational establishment), is to read carefully before posting.
Posting questions that are clearly about your project in a section labelled "For problems with Arduino itself, NOT your project" isn't going to endear you to other forum users.
