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1  Using Arduino / Motors, Mechanics, and Power / How to use a rotary encoder with Arduino on: December 24, 2012, 06:29:50 pm
Hi,

I just got a car kit ( http://dx.com/p/37-in-1-smart-car-chassis-kit-for-arduino-black-yellow-151814 ) with a provided "encoder wheel" (not the electronics part actually, just the mechanical part) and I need to use an encoder (to track my car's movement, as I want to make a semi-autonomous robot).

How can this be done with Arduino ? Using an IR sensor + interupts seem to be quite complex;

I've seen that there are some components that already implement a rotary encoder and that I'd just need to hook-up on my motor's axis to get the correct value (this for example : http://dx.com/p/octopus-rotary-encoder-brick-for-arduino-150690 ); Has anyone tried this ? Do you think it could work in my case ?

Thank you in advance !
2  Using Arduino / Networking, Protocols, and Devices / Can't connect to an RN-XV's AdHoc network on: December 15, 2012, 07:04:06 pm
Hi !

I managed to configure my RN-XV to create an AdHoc network (with static ip, no DHCP), but when I click on that network from my computer (to connect on it and launch some commands from telnet for example), the connection can't be established and it just times out (even if the board detects that someone wants to connect).

Can anyone help please ? (I'm supposed to make all this work in two days for a presentation !) Thank you in advance smiley
3  Using Arduino / Motors, Mechanics, and Power / Re: Rechargeable battery for 3 motors on: December 05, 2012, 11:55:20 am
Oh, just a last question:

How can I recharge this ( http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=16331 ) kind of batteries ?
4  Using Arduino / Motors, Mechanics, and Power / Re: Rechargeable battery for 3 motors on: December 05, 2012, 11:53:01 am
Thank you guys for all these insights.

I think I'll just go for the LiPo I've posted earlier as I don't have any much infos about the motors and see how it works out !
5  Using Arduino / Motors, Mechanics, and Power / Re: Rechargeable battery for 3 motors on: December 01, 2012, 08:34:25 pm
Thank you for the link !

I've found this battery that seem nice :

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=16331

But I don't really know if it'll be enough for what I want.

First, I need a ~9v battery for the Arduino Mega (that one will do the trick with its 11.1v).

And then I need another battery for my motors. I will have 2 stepper motors ( http://dx.com/p/dc-5v-28ybj-48-stepper-motor-for-arduino-2-pcs-148819 ) and one servo ( http://dx.com/p/sg90-mini-servo-with-gears-and-parts-2kg-torque-35764?rt=1&p=2&m=2&r=3&k=1&t=1&s=133696&u=35764 ) ; they will be connected to the Adafruit motor shield.

I'm really new to electronics so I don't really know what kind of batteries are compatible and how much current / voltage I need !

Any help would be much welcome !
6  Using Arduino / Motors, Mechanics, and Power / Rechargeable battery for 3 motors on: December 01, 2012, 06:26:25 am
Hi,

How should I power 3 motors (2 steppers and 1 servo) ? I guess the Arduino's power wouldn't be enough, and I need portable sources of energy anyway (as it's a robot).

FYI, I'll be using the Adafruit motor shield to control the motors and I'm using an arduino mega. (So yes, I'll need a battery for the mega too !)

Know any (easily) rechargeable batteries that could handle the Mega and the motors ? (not necessarily a battery that does both)
7  Using Arduino / Motors, Mechanics, and Power / Re: Which Servo and Stepper for a robot car ? on: November 30, 2012, 06:44:40 am
You could control it with WiFi from your phone too (what sucks is that the WiFi shield can't be used as a host, so you have to configure it to connect to the right WiFi spot each time).

I'll be using the Adafruit Motor Shield which should manage all the motors I'm using, hopefully.

I still don't know which kind of stepper motors I should choose :/ The specs don't mean anything for the beginner I am.
8  Using Arduino / Motors, Mechanics, and Power / Re: Which Servo and Stepper for a robot car ? on: November 29, 2012, 08:03:29 pm
Thank you for those links smiley

I think mine is really expensive because I want to use a WiFi module (which costs ~70-80€) and an Arduino Mega (from Ebay: 25€) + an expensive sensor (25€)

I noticed you used the chassis with the built-in (DC) Motors. Any idea if those motors can be easily changed for stepper motors ? (actually, I bought the exact same chassis ! But I bought it from a chinese seller on ebay and I won't get it before 6 or 8 weeks) ; If you know any stepper motor with a good precision (but adapted to a robot like the one you're building), it'd be welcome !
9  Using Arduino / Motors, Mechanics, and Power / Re: Which Servo and Stepper for a robot car ? on: November 29, 2012, 02:07:16 pm
Oh, that's great bobo ! Could you send me your mail by private message ? I'd have some questions I'd like to ask.

Also, the components I chose would cost around ... 130€ ! So I'm surprised that you could find all what you need for only 40€ (or was it just the motors?!).

Anyway, I'd be very glad if you could give me the REF. of the motors you chose :-).

Happy to see I'm not the only one interested by those kind of robots (and hope you'll do great with your project !)
10  Using Arduino / Motors, Mechanics, and Power / Which Servo and Stepper for a robot car ? on: November 29, 2012, 11:11:49 am
Hi,

I just dived into the Arduino world and want to create a little robot car with an ultrasound sensor mounted on a servo, and using a stepper motor to keep track of the car's movements. (+ some algorithms to make sense of all that)

The big problem I have now is determining which motors to use:

. The perfect choice for the servo would be the Tinkerkit Servo ( http://snootlab.com/tinker-it/231-module-micro-servo-tinkerkit-fr.html ) because I'm ordering a lot of stuff from that shop and that's the only servo they got. But ... I guess we can't use a Tinkerkit servo without a Tinkerkit shield, right ? (I'll be using the Adafruit motor shield)

. For the stepper motor, I need to be as precise as possible, in a reasonable size (that can fit in a little car, not a *real* car's stepper motor  smiley-razz )

The motors shouldn't be too expensive. Like ~30€ max for both of them if possible (if it's just a little more, I could cope with it)

Any ideas ? (including websites where I could buy those; FYI I live in France)
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