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16  Using Arduino / General Electronics / Re: Arduino, output voltage dropping on: August 03, 2013, 10:31:12 am
so im going back and forth between USB connection, and power supply.  I have the power supply 5v connected to my rails, and i have a lead from my plus rail going to 5v on the arduino, and i have the grounds connected, other than that its the sam setup i used with usb
17  Using Arduino / General Electronics / Re: Arduino, output voltage dropping on: August 03, 2013, 10:17:43 am
understood, but when put on 5v from power supply it goes completely wacky
18  Using Arduino / General Electronics / Re: Arduino, output voltage dropping on: August 03, 2013, 10:09:37 am
so its working decently know when powered by USB to arduino.  It holds 4.8 volts well.  Why not five? i put 560 ohm resistors on the common anodes. But heres the odd thing, when i hook it up to a power source 5v, the numbers displayed go crazy, i have no idea why.
19  Using Arduino / General Electronics / Re: Arduino, output voltage dropping on: August 03, 2013, 09:27:50 am
I dont have resistors from segments to output pins.  Could there be too little resistance causing the current to spike?
20  Using Arduino / General Electronics / Re: Arduino, output voltage dropping on: August 03, 2013, 09:12:56 am
im not sure about the specifics of my supply, but is two 7 segments, too much to handle for going from USB to the arduinos regulated 5v?
21  Using Arduino / General Electronics / Arduino, output voltage dropping on: August 03, 2013, 08:58:32 am
hey guys, so im working on using a LM34 temp sensor to give a read out to two seven segment displays being driven by two DM7447 ICs.  I check stuff along the way and made sure the sensor was giving good readouts to the serial monitor, but it seems when powered up the ICs and seven segment make it so the 5v output drops to about 3.6, and that messes up my temp sensor code, why is that supply voltage dropping so much just from 2 seven segments?  also i tried with a power source too, drop to about 4.6, its giving me bad numbers.  When i disconnect the ICs and check the serial monitor i get good data.  Thanks for your time
22  Topics / Robotics / Re: Hub size with omni wheels? on: December 09, 2012, 05:01:29 pm
im just confused, how can you mount a hub on that inner circle when there's no screw holes???
23  Topics / Robotics / Hub size with omni wheels? on: December 08, 2012, 01:54:47 pm
Hello friends!  I'm making a small 3 wheel drive bot with omni wheels but i just have no clue what hub size for these wheels.  Can anyone help me out? http://www.robotshop.com/productinfo.aspx?pc=RB-Nex-08&lang=en-US
 

Thanks for your time
24  Using Arduino / Project Guidance / Re: Can you fit two 298 H-bridges on an arduino uno on: December 06, 2012, 10:15:30 pm
Yeah, I'm talking about the already assembled boards that have the heat sink and all
25  Using Arduino / Project Guidance / Re: Can you fit two 298 H-bridges on an arduino uno on: December 06, 2012, 09:39:45 pm
I'll have a separate board for power distribution but other than that I would only need four pwm pins on the UNO right?  One for each motor.  What else would I need to plug in other than ground?
26  Using Arduino / Project Guidance / Can you fit two 298 H-bridges on an arduino uno on: December 06, 2012, 06:54:48 pm
Hello friends!  Im building a little rover and i need at least 3 motor driver on an arduino uno.  Could i simply fit two L298 dual H-Bridges on there?? thanks for your time.
27  Using Arduino / Project Guidance / Re: 3 motors on an arduino????? on: November 27, 2012, 06:06:41 pm
Thanks for all your help!  im starting to really iron out some details, heres a picture of what i drew up on sketchup.  http://s1302.beta.photobucket.com/user/amp6251/media/ScreenShot2012-11-27at60618PM.png.html?sort=3&o=0
28  Using Arduino / Project Guidance / Re: 3 motors on an arduino????? on: November 27, 2012, 11:05:18 am
But the link on ebay isnt a L9958 (the data sheet you sent me), and how do you daisy chain?  Does all the stuff from the data sheet apply to that bridge?  Thanks for all your time.  Also can you run brushless motors on it?
29  Using Arduino / Project Guidance / Re: 3 motors on an arduino????? on: November 27, 2012, 09:44:15 am
yeah i did mean pins, that clear up a lot thanks. also do you know how many amps those bridges can support per motor?  it wasnt on the description
30  Using Arduino / Project Guidance / Re: 3 motors on an arduino????? on: November 27, 2012, 06:49:43 am
Is there enough room on the uno to fit three?
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