Show Posts
Pages: [1]
1  Using Arduino / General Electronics / Re: Motor polarity on: October 16, 2013, 04:31:54 pm
The motors are generic because its from an RC car, probably nothing too fancy though. The shield is  a Motor Shield V1.2 by Seeed studio

I ended up just building my own motor shield using two relays. When I really thought about, the robot isn't going to be stopped anyway. If I get into the project and realize I do need them stopped I'll look back into it. But as far as the shield goes, does that mean if I had a different shield I wouldn't run into this problem?
2  Using Arduino / General Electronics / Motor polarity on: October 16, 2013, 11:40:03 am
I am working on a robotic project and am in need of some help. I need a way to flip the polarity of the motor leads so it can go either forward or backwards. I first tried to use a motor shield but for some reason it doesn't work out. As soon as I put the robot on the rug it wont budge and on my desk it barely moves. Now if I hook the motor up directly to the battery it is really strong and fast even on the carpet. So I am assuming that the motor shield isn't letting all the current through or limiting it somehow.

I currently have a set up like this which is working perfectly as far as being able to move:

I use a TIP120 and can control the motor to move forwards but obviously not backwards yet. I know there are H-Bridges but I was trying researching about them and from what I read (I don't know if it's true), but the arduino and the motor would have to be sharing the voltage supply which I really don't want. An H-Bridge would work out good as long as I can somehow have the motor's running on their own battery.

I also considered just using two SPDT relay's and connect them up to switch the polarity. Only problem then is it would be either always forward or always backwards and never just at a rest without adding another relay or getting a transistor or two in there. Anyone have ideas on how I can do this?
3  Using Arduino / Installation & Troubleshooting / Re: Arduino not uploading on: August 18, 2013, 01:50:16 pm
Working now. I have NO IDEA why. If more problem come ill make a new thread but I guess we can call it quits for now. THANKS!!!  smiley-grin
4  Using Arduino / Installation & Troubleshooting / Re: Arduino not uploading on: August 18, 2013, 01:46:11 pm
Windows 7 Home Premium. Yeah the UNO shows a port number (but wasn't plugged in during the screenshot) but when the Duemilanove is plugged in it doesn't show a port number
5  Using Arduino / Installation & Troubleshooting / Re: Arduino not uploading on: August 18, 2013, 01:20:46 pm
Hmm, This is what my arduino Duemilanove does, Theres no COM port next to it and looks like a generic COM device. I tried to manually install the arduino.inf file by going to device manager -> update driver ->browse my computer -> let me pick device -> have disk -> and then I choose browser and go to the arduino.inf file and then my computer ends up getting a BSOD. None of this sounds good :/ am i installing the driver wrong? I never was prompted by windows, it just installed a generic one automatically. I'm guessing my problems with the Duemilanove are just driver related. As long as I can get one to work for now I am happy
6  Using Arduino / Installation & Troubleshooting / Re: Arduino not uploading on: August 18, 2013, 12:40:03 pm
Been mainly working on the UNO since thats the one I just did a loopback on the Duemilanove and it worked. However I still can't upload to it. The Duemilanove shows up under the COM with no yellow!. However it is listed as USB serial port instead of something more specific to the arduino. Also under devices and printers it shows up as "FT232R USB UART." Could it be a driver issue with Duemilanove and a bad UNO? Talk about bad luck
7  Using Arduino / Installation & Troubleshooting / Arduino not uploading on: August 18, 2013, 12:30:11 pm
Hello, Whenever I try and upload to my arduino I get an error that says "avrdude: stk500_getsync(): not in synch: resp=0x00"

I dont know what the problem could be. Im getting the same error on my UNO R3 and my Duemilanove.. I did a serial loop back test and that failed. However when I sent a bit over I could see my Rx led light up but no my TX. Under my device manager it is listed as UNO (COM5) and I am POSITIVE i used the right port and board. Any idea. I dont think the board or chip is bad because i doubt BOTH are bad
8  Using Arduino / Project Guidance / Re: New Arduino Chip on: January 05, 2013, 10:34:29 pm
Ok great! Thank you so much for your help
9  Using Arduino / Project Guidance / Re: New Arduino Chip on: January 05, 2013, 10:12:04 pm
1) Yep plugged in the right way
2) I didn't get the error when I switched the board to Uno under the settings and uploaded, it just said done uploading. I tried to interface it with my computer program but it didn't work. I am away from my arduino right now but I can later try uploading a simple LED blink just to test out if it works. What happens if it has the Uno bootloader on it? Would it still work or will I have to put the duemilanove one on? Right now I'm working on interfacing with software and Serial communication if that makes a difference.
3)...yeah...I hope not :/ shipping takes forever
10  Using Arduino / Project Guidance / Re: New Arduino Chip on: January 05, 2013, 09:58:22 pm
Here is a link for it:

I don't know anything about bootloading. It says it has a pre-installed one
11  Using Arduino / Project Guidance / New Arduino Chip on: January 05, 2013, 09:45:46 pm
Hello, I have an arduino duemilanove and got it quite a few years ago on ebay. It came with the ATMEGA168 which has been working great but I wanted to interface it with Labview and the sketch was too big for the 168. I ordered a ATMEGA328 off of amazon and I just can not get it to work. I am not sure if there is a certain way you have to set up a new board. I get an error that says this:

"avrdude: stk500_getsync(): not in sync: resp=0x00"

All I did was switch out the chips but I am not sure if there was another step I missed. The arduino was working great before I switched. I saw something about a loopback test by connecting a wire from ground to reset and rx and tx and it was echoing back like the test said it should. I don't know if that helps. Any advice?
Pages: [1]