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91  Topics / Robotics / Re: Calibrating differential steering to go straight on: September 21, 2013, 02:05:52 pm
I Library will simplify things!

http://www.pjrc.com/teensy/td_libs_Encoder.html
92  Using Arduino / Project Guidance / Re: How to detect a coin falling? on: September 21, 2013, 09:11:46 am
Lets stick to the topic here "how to detect a coin falling"

I think my idea will work fine. As Paul_G said if you incase the photo resistor so that the only opening is in a place that will be blocked when the coin falls you should have no problem. If you have the stuff you could always test it out. It should only take a few moments to try it.

Best of luck!
93  Using Arduino / Motors, Mechanics, and Power / Re: Power Supply Question on: September 20, 2013, 08:41:50 pm
Quote
your probably going to need some circuit protection in case of stall or fault. 

And a bigger motor driver! Even a somewhat small load would kill the motor shield he was looking at! The motors are going to pull a lot more then 10amps.
94  Using Arduino / Motors, Mechanics, and Power / Re: Power Supply Question on: September 20, 2013, 02:54:32 pm
Use this power supply if you want everything off one power supply...

http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&productId=213752&catalogId=10001&CID=PDF133CAT

What you need is at least 8amp at 12v and about 3amps at 5v.

The other option would be to get a higher amperage 12v power supply and then a voltage regular for your Arduino.
http://www.robotshop.com/productinfo.aspx?pc=RB-All-45&lang=en-US

http://www.robotshop.com/dimension-engineering-de-swadj3-switching-regulator.html

Edit: I just check your links and from what I can see your motors are 4amp min draw current. Your max probably breaks 100 amps. In that case the info above is useless as well as your shield.

Depending on your usage the motor drivers above will work, however, they come at a cost…
http://www.orionrobotics.com/RoboClaw-2x60A-Motor-Controller-with-USB_p_333.html

http://www.robotmarketplace.com/products/0-SABERTOOTH2X60.html

This is going to cost a lot more then you expected.
95  Community / Bar Sport / Re: KUDOES to Amazon.com!!! on: September 20, 2013, 02:08:35 pm
Amazon prime is the way to go. I just ordered some LED's for like 3$ with free two day shipping.
96  Using Arduino / Project Guidance / Re: How to detect a coin falling? on: September 20, 2013, 02:03:10 pm
Just plug the LED into power/ground… don't for get the resistor! The longer leg should be + I think.

 For the photo resistor read the link below.


http://arduino.cc/en/Reference/AnalogRead
97  Using Arduino / Motors, Mechanics, and Power / Re: 24v H-bridge for wheelchair motors on: September 20, 2013, 01:53:14 pm
I'm about to start building a motor control for a amp flow motor and at 285amps they are a beast! I was considering using a few mosfets…
http://ec.irf.com/v6/en/US/adirect/ir?cmd=catSearchFrame&domSendTo=byID&domProductQueryName=IRFB7437

Perhaps they would work for you. They are only a $1 each!
98  Using Arduino / Project Guidance / Re: How to detect a coin falling? on: September 20, 2013, 01:40:09 pm
What about a led (or laser)  and photo resister? When the coin slides down less light will shine on the photo resistor. And the best part is you probably already have the stuff!
99  Using Arduino / Installation & Troubleshooting / Re: Is my Arduino Uno genuine? on: September 18, 2013, 08:53:56 pm
Does it say "made in Italy" or "designed in Italy?" Real Arduino's say "made in Italy." Also, Just because it is fake does not mean that it will not work…
100  Community / Bar Sport / Re: Best digital multimeter? on: September 18, 2013, 08:46:35 pm
I think I will go with the fluke 117 as it seems to be a good deal.

http://www.amazon.com/Fluke-117-Electricians-True-Multimeter/dp/B000O3LUEI/ref=cm_cr_pr_product_top
101  Using Arduino / Motors, Mechanics, and Power / Re: How to make 2 dc motors move together using motorshield? on: September 17, 2013, 10:39:22 pm
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It sounds to me like you power supply can not supply enough current for two motors.

Or his motor driver is not able to handle the load and is starting to act up. Perhaps one of the motor uses up more current do to some mechanic flaw in his robot/car and the motor driver is not able to handle it. He said the motor driver is buzzing, not the motors. Then again it could be the power supply. Who knows when we have no specs.

@ timlee we need to know what motor driver, motor, and power supply your using.

Best of luck!
102  Using Arduino / Motors, Mechanics, and Power / Re: Mounting a Wheel to the DC Motor on: September 17, 2013, 03:43:21 pm
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What do you guys do for making the body parts as well?

1. I design a frame and have a welder make it from me.

2. I make a design on inkscape and have it laser cut.

3. I buy a pre made kit.
103  Using Arduino / Motors, Mechanics, and Power / Re: How to make 2 dc motors move together using motorshield? on: September 17, 2013, 03:38:19 pm
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Hi I am using an arduino uno stacked with a motorshield.

It would help if we knew which one!
104  Topics / Robotics / Re: How to make wall/obstacle avoiding robot with arduino uno atmega 328 on: September 15, 2013, 11:38:52 am
Sorry I did not notice. I put the code together a little to fast. smiley I will update my post soon.

I'm a little confused. That is how your code was. I just copied it in. Does it work like that...

Code:
int ENA=5;//connected to arduino's port 5 (output pwm)
int IN1=2;//connected to arduino's port 2
int IN2=3;//connected to arduino's port 3
int ENB=6;//connected to arduino's port 5 (output pwm)
105  Topics / Robotics / Re: Wheel Placement on Robot on: September 14, 2013, 03:43:45 pm
95% of the weight of the robot will be in the center so I don't think it will tip. Thanks for your help. I will post photos once the robot is built as well as the results.



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