I just purchased an Arduino Mega board, and I have dome some simple experiments succesfully with some sensors and leds.
My next step is to build a movile robot for an artificial intelligence research, but things are getting a bit complex now, because of the motors.
I am a programmer specialized in Artificial Intelligence, so I have not problem at all when it comes to code stuff in any languaje, but my electronic knowledge is extremely limited. If any kind man can answer me a few questions, I would really appreciate it
I want to buy this chasis (sorry, the link is in Spanish and I cant find it in english):
In the specification says it has 4 12v DC motors
RPM: 108~120 (nice because I need torque power, not speed)
Motor nominal current : 0.37A
0.34A x 4 motors = a total of 1.48A current supply for the motors to work propperly right?
For the Motor driver, I have seen this as a good option, since it can handle 4 DC motors at 12-35 V:
The confusion comes here;
Drive part peak current Io: 1A
Drive part continuous current: 600mA
Does that mean that this motor controller can only handle 1A at maximum, and 0.6A in average? that would be a problem because I need 1.48A so the motors have enough current (if my previous assumption is right).
I have also seen this controller:
It specifies "Driver peak current: 2A", which would be enough, but I would need to purchase 2 of these (more wires and connections needed).
And finally, we come to last part, the external power supply. I've been looking for a cheap 12v medium-high capacity battery so I can run my car for at least 2 hours, and I found this:
This battery would be used ONLY for the motors, not for the arduino/sensors. Arduino and sensons will use another battery (mostly because 12v is too much).
It has 6.8 Ah (well, that's the theory... it will always be less), theorically that means that I will be able to run my motors for 6.8/1.48 = 4.8h right?
My problem here is the discharge rate. I read somewhere that for nhim batterys, the discharge rate is usually 1.2 times the capacity. This is not a nmhim battery, its a Lithium-ion battery. Any one knows the Discharge rate of these batteries? It is not specified. I need a minimum of 1.48A discharge rate to provide enough current to the motors.
Well, those are my questions. I have been googling A LOT, but i couldn't find the answer for this questions. The total of this pieces is more than 100€, so I just want to be sure I don´t buy incompatible things. Who knows, may be that battery Discharge Rate is too high for the motor driver and it burns out...
Thanks a lot!
P.S: To make things clearer, I have bold the questions.