It contains some transistors, NPN/PNP resistors and something else weird. But that is what I got from the stock RC car. Thanks for your reply, I did post my entire project breadboard layout. That PCB, what is on the other side, and that is what came out of the RC car? I checked with DMMĪre you saying the L293 is waste for my project and I should look some something more stable ?Ĭan you post a picture of your entire project please.Īlso please attach your files, do not have them as links. When the motors run directly from 9v battery they consume around 1.5 to 3v. how the stock Chinese RC was able to power up those 2 motors ? ( would like to know this ) It is critical to know this (for all you know, the L293 can't supply the needed current to get the motors running). I've also attached the Chinese PCB here: Ĥ AA alkaline batteries won't be enough - you're only getting 6 volts from those (1.5V x 4).Īlso - know that the L293 drops 1-2 volts from the battery to the motor (and this gets worse as the current drawn increases).ĭo you know what the stall current of your motors are? If you don't know that yet - you're shooting in the dark. How come these chinese RC car powers up with simple PCB that contains transistors, capacitors and PNP/NPN's to power these motors.Ĭan we use the same with 1x 9V Battery or 4 x AA batteries with arudino nano ? My other biggest concern is to keep the batteries space as much small as possible, Which is why I chose 1 x 9V to fit inside the stock RC car. Please check my updated diagram below and let me know. And based on your reply, It is good to use 2 9V batteries ? 1 for powering nano and 1 for powering motors ? You will probably need a supply for the nano and a supply for the motor. The when you try to start the motor, the battery voltage, because it cannot supply the current needed to start, will drop and cause the nano to reset. PS: Have you checked my diagram ? anything wrong in that ?ĭo you have a DMM to measure voltages in your project.Īs said before, the 9V batteries will not be able to provide the current needed to even start those motors through the driver. I wanted to have the same functionality I had before but with arduino. It has 2 motors ( forward/reverse and turn left/right ). Instead, I ripped an existing RC car ( ferrari italia, to be specific ) and working on it. Making the steering mechanism, and the centering mechanism to go straight, is a much bigger deal than just controlling the sides separately. Just use 2 identical reversible motors to turn, run only one motor, or run them in opposite directions. I'm not sure.If this is what you mean by plummeting.Īlso, re: your steering plan, don't do it like that. Although I noticed, When the motor try to spin the light on nano board is dimming a bit like a low-voltage. I need 12v for motor and 5v from arduino to control transistors. I have these transistors in H bridge arrangement. I can't figure out how to connect external 12v power supply to this. I have 4 NPN transistors BD911 switched with arduino. I can't use relays because they use a lot of power. 9V from HW and Duracell and 4 x AA batteries Duracell.īoth of them are not working. I'm building motor with changing polarity. I tried 3 different batteries with 2 types. The one you showed a picture of looks like a crappy brand too. It's not at all uncommon for people to post here with projects where as soon as they turn the motor on, it resets everything because the battery can't supply the load. Is the battery voltage plummeting when you try to turn the motor on? 9v batteries like that are terrible - the current handling capability is just awful. I mean it's trying to spin but all I hear is a weird strange noise from the motor. Because it spins for 1-2 sec and then stops and doesn't spin again. Try modifying your sketch to log to serial when it starts up, and when it tries to turn on the motor - then you'll know if it's resetting itself. It had ceramic capacitors on the motor and on the Chinese circuit it was using a PNP or NPN transistor I guess. Cause, I ripped an existing RC Chinese CAR to take this motor. The motor I'm using.probably a 1.5-3v DC Toy motor. It starts to spin and then stops within 2-3 seconds and I hear a weird strange noise inside the motor. When I tried to push start the motor ( clockwise ). The pins I used are 10, 9 and 8 ( Please check the schem/diagram ) I connected everything and used a simple code first to test spin the motor from the driver with a delay of 3sec ( forward / reverse ) ( check diagram )Īnd Instead of big clumsy 4x AA battery box, I chose to use 9V battery to save space. It contains L293D Motor Driver chip on board without any capacitors, resistors or regulators. So, I chose arduino nano + A Simple DC Motor Driver to drive 2 DC motors ( forward/reverse and turn left/right ) My first project is to build an Simple RC car with smaller elements as much as possible at the same time without too many complex stuff. uxcell Synchronous Gear Motor AC 24V 1.4-1.First, Thank you for taking the time to look at my problem.īasically, I'm new to arduino and electronic stuff.
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