Thanks I will try that.

Perhaps I did not explain my problem well. I have posted a link Illustrating how the RFID Reader hooks up to the Arduino. Although I have a mega and i'm not using the LED's the rest is the same. What I have to unplug is pin 0.

http://bildr.org/2011/02/rfid-arduino/


Thanks!

Hello,

I have an RFID reader but each time I turn on the Arduino I have to unplug the RFID RXO Line for a second. Once I put it back into the board the reader will work until I turn off the Arduino. Is this normal and is their any way around it?

Also, i'm using a MEGA 2560 and Pin 0.

Thanks!

The first thing you will want to do is build a frame. Just use some wood or metal to start with. Once you do that read up on how to wire everything together. Until you do that their is not much more we can help you with. As for the programing come back and ask for help once the robot is built.

I have posted a few links that should help you get started.


http://www.robotplatform.com/howto/L293/motor_driver_1.html

http://luckylarry.co.uk/arduino-projects/control-a-dc-motor-with-arduino-and-l293d-chip/

Best of luck,
Drew Davis

Thanks for all the help! I connected all the grounds together and everything is working well. I would love to learn what a ground loop is though.



Thanks!

Also, I forgot to mention that each motor driver will be using their own battery pack. So what I plan on doing is running both the grounds of the battery back together and one pin coming from the ground on the Arduino. Then from the connection I will have two wires, one for each ground connection on the motor driver.

Thank you! Those explanations helped me understand a little better. So from what i'm understanding it's ok to hook all the grounds used in my project to one ground pin on the Arduino. I just want to make sure before I power everything up because I really don't what to lose any parts!


Thanks again!

Hello,

I'm starting a project and I don't know what to do. I will be using a MEGA and two motor controllers (see link below). I was wondering how I should ground everything. Is it ok to have everything grounded on to one Arduino pin? I'm confused because the motor driver has a common ground between the battery pack and the Arduino but I thought to ground something together it had do be the same voltage. I don't really understand how grounds should work so some info would be appreciated.


http://www.dfrobot.com/index.php?route=product/product&product_id=66#.UYzwB5UrdEc


Thanks!

I will keep that in mind.

Thanks!

Thanks for the info. I could not find one for the Sn754410 at spark fun and the pins looked like they would match so I figured it was worth asking.

Would this breakout board work for the sn754410?

https://www.sparkfun.com/products/9540


Thanks!

Thanks pito!

I did not know that if the robot was moving at the same speed it would not inter fear with the readings. Problem solved!

I would love to help you but I need some more info. To start with please give us what motor driver you are using, what type of Arduino you are using, and what type of power supply you are using.

Catford,  I would like to help you but I don't know anything about rc helicopters. Try starting a new post and other members will weigh in.



Groundfungus, I do need the sensor to be accurate while the robot is moving. Do you have any suggestions as to what I should use?


Thanks!

Is their any one you recommend? I was looking at spark fun and they seem to have a lot of choices! I would prefer something really simple to program and cheap in price.

Also, the robot will be moving up the hill when the sensor is reading.


Thanks!