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1  Using Arduino / Motors, Mechanics, and Power / Re: PWM H Bridge on: December 21, 2011, 11:41:55 am
Thanks for the replies

I'm thinking about rather using mosfets instead of transistors since i read the transistors have a larger power loss. What mosfets could i use that can handle at least 10-15amps?
Anything i have to look out for when choosing them? Also can i still use the schematics from the first post and simply substitute the transistors with the mosfets or will  I also have
to get
And is there a advantage of using a motor driver between the arduino and the mosfets/transistors?
Does anyone have any alternative schematics for a simple H bridge
Thanks

Philipp
2  Using Arduino / Motors, Mechanics, and Power / PWM H Bridge on: December 20, 2011, 03:32:20 pm
Hello smiley

I want to build a motor controller that can handle 5-6 amps
Im planning on using these schematics for a transistor H bridge http://aelexian.4rumer.com/t312-10a-h-bridge-motor-controller
It doesnt seem too hard, looks like i"ll need 2 pins plus the ground to control it as is but is it possible to modify it so that it gets controlled via PWM
and only needs one pin plus ground? (Like rc servos/esc's) How would I go about doing this and what would I have to add/change in the circuit?
Will I have to use the analog pins for the PWM?

Any help Appreciated
Thanks
Philipp
3  Using Arduino / Motors, Mechanics, and Power / Dc Motor Control on: February 13, 2011, 09:27:40 am
Hello
I planning to control 2 dc motors via arduino. The Motors are 12v
Motors draws about 30amps and the other about 10amps
I have to be able to control speed and direction.
Does anyone have schematics for a circuit i could use to drive either of these motors
Thanks
4  Using Arduino / LEDs and Multiplexing / Powering Components on: February 13, 2011, 04:41:32 am
Hello
I just got my first arduino smiley
And wanted to know
Whats the max amount of power it can provide to connected components?
and how can i connect a led to be driven by a external power source?
I know the ground goes to the arduino ground but what about the positive? Where does that connect?
Btw why is it always necessary to connect a resistor between led and arduino connection, is it only to drop voltage or does it also serve another purpose?
Thanks
5  Forum 2005-2010 (read only) / Interfacing / Re: Arduino controlled ROV on: December 19, 2010, 12:16:59 pm
Thanks

That was a very helpful post smiley
So to use the joystick I would have to use a program to "bridge" the arduino and the joystick signals. What program could i use for this

Thanks
Philipp
6  Forum 2005-2010 (read only) / Interfacing / Re: Arduino controlled ROV on: December 19, 2010, 11:03:30 am
Thanks so much man smiley
Im planning to have it connected to the pc and then use a joystick or gamepad as inputs so that
all the instructions and inputs would be sent over the usb cable so no pins are neccesary for input then?
This should work right? or do the inputs have to be connected directly to the arduino

Thanks for all the help smiley
Philipp
7  Forum 2005-2010 (read only) / Interfacing / Re: Arduino controlled ROV on: December 19, 2010, 10:13:43 am
Thanks for the Info PaulS smiley

So just to be sure before i buy 1
to control 4 brushless esc's withs motors and so that each one can be individually varied from stop to full throttle
and to power 5 relays (on/off)
the duemilanove will be enough or would i have to get the mega?

Thanks for all the help so far, sorry if half my questions seem stupid lol :smiley

Philipp
8  Forum 2005-2010 (read only) / Interfacing / Re: Arduino controlled ROV on: December 19, 2010, 03:39:41 am
Hey
i was hoping someone could help me with this:
What is the maximum amount of servos/esc i can control individually with a arduino duemilanove

*Btw should i rather get the duelianove or the mega (need to control 4 esc's and 4 relays )
Thanks for the help
Philipp
9  Forum 2005-2010 (read only) / Interfacing / Re: Arduino controlled ROV on: December 18, 2010, 02:30:46 pm
Thanks
Ive already seen schematics for the relays. So i will need 1 digital pin per relay
and to control the esc will be 1 analog pin for the pwm and the other 2 esc cables will go to the power supply (directly to battery or psu)
Is that correct?
And it is possible to make a pc gui via which you can control the arduino is that correct?
Sorry for all these questions smiley
Thanks

10  Forum 2005-2010 (read only) / Interfacing / Re: Arduino controlled ROV on: December 18, 2010, 12:26:33 pm
So i can either control the arduino via the pc fuctions such as mouse,joystick and keyboard when its plugged into the pc (im guessing this is the better option if the system doesnt have to be portable and has lots of motors, relays that have to be controlled)??? :-?
If it is coded to recieve input from the pc i cant use it without 1 unless i modify the program right?

or download the program and use it on the go. and In this case how do you control it (just switches ect?) or is the on the go more for autonomous projects such as robots, bots ect that mainly control themselves with sensors ect?
Thanks
Philipp
11  Forum 2005-2010 (read only) / Interfacing / Re: Arduino controlled ROV on: December 18, 2010, 11:14:34 am
Thanks for the replies  smiley
 
The esc arent reversible so the motors would only have to be controlled in 1 direction.

when the arduino is connected to the pc can it recieve instructions from the pc though like pressing keyboard button turns on motor connected to the arduino ect?

Would the coding for something like this be hard to create (I already know loops and some other basics)
Thanks Philipp

12  Forum 2005-2010 (read only) / Interfacing / Arduino controlled ROV on: December 18, 2010, 10:47:57 am
Hey all
Im currently building a rov and am considering using a arduino to control it. I was considering the Uno since this is the only 1 available here smiley
but since im new to all this i still have some questions

1.Can a arduino Uno control 4 brushless esc's + motors and 4 relays at once? (motors and relays have to all be separatly controllable). Does the uno have enough channels/outputs to control all these functions at once. Would there still be ports open to control more functions?

2.Would i need some kind of shield to run the esc's and motors or can they be connected directly to the Uno?

3.Could i control the motors via a joystick connected to pc with usb(for variable speed)

4.Probably a stupid Q but the arduino cant be used when not plugged into a pc right? smiley

If someone could help me here i would really appreciate it
Thanks
Philipp

Sorry if some of the questions are stupid, im still new to all this smiley
13  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Extending arduino cable on: January 11, 2011, 05:53:55 am
Thanks

To use a RS485 connection (not using that shield, just using ar arduino with RS232 connector instead of usb and connecting a RS485 converter to that) would the converters have to be half duplex or full duplex?

I was considering use the following converter
http://aquaticus.info/rs485_to_rs232
But im not sure if it will work since it says its half duplex

Thanks

14  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Extending arduino cable on: January 08, 2011, 06:47:50 am
Thanks

So if I use that shield does the RS485 just replace the usb connection.
Can it still receive and send commands and data via that without any limitations?


15  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Extending arduino cable on: January 08, 2011, 04:23:20 am
Thanks

Would I have to use full duplex converters or can I use a half duplex aswell for RS485
(arduino will recieve inputs from pc and send data from sensors to pc)
So I would have to use a usb to R485 converter at the pc and a RS485 to RS232 converter at the arduino end, correct?

Thanks
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