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1  Using Arduino / Project Guidance / Re: Drinks Dispenser on: December 22, 2013, 02:13:00 pm
you could always buy one of these
http://www.walmart.com/ip/Arrow-Plastic-Mfg.-Co.-1.25-Gallon-Fridge-Stack-Beverage-Dispenser-in-Clear/16636115
and put a servo on the lever, you could always remove them and clean them.
2  Using Arduino / Installation & Troubleshooting / Re: Not enough power for Arduino + Shields on: December 13, 2013, 06:41:57 am
you need to figure out how much current everything uses. then you can pick a power source that can supply that
3  Using Arduino / General Electronics / Re: MOSFET Input Voltage on: October 26, 2013, 07:03:52 pm
Thank you, These responses help.
4  Using Arduino / General Electronics / MOSFET Input Voltage on: October 26, 2013, 05:58:42 pm
I have a couple of these https://www.sparkfun.com/products/10213 MOSFETs
I use an arduino to generate the 0-5 volt PWM signal and use 12 volts through it to power a 1 amp motor.
What exactly would happen if I didn't use the Arduino an put an input of 0-12 volts on the signal line of the MOSFET? Would the MOSFET Just max out the output voltage when the signal voltage reaches 5 volts or will this damage the MOSFET?
5  Using Arduino / General Electronics / how do 2.4 Ghz transmitters work on: October 02, 2013, 06:42:56 pm
how do devices like xbee's have clock signals to transmit at 2.4 Ghz do they have some type of crystal oscillator? Or is it something different entirely?
6  Using Arduino / General Electronics / Ambient radio wave energy on: September 29, 2013, 09:34:27 am
I am trying to do a demonstration in which energy from ambient radio waves (it doesn't matter which frequency) is used to charge up capacitors and blink a red 3 volt 1 mA led every 10 seconds or so. Is this feasible? If so how can I go about building it.
7  Using Arduino / General Electronics / High power LED's on: September 16, 2013, 09:23:41 pm
I am planning on making a high power flashlight. I would like to know what kind of resistors I would need if any to power 6 of these http://www.goldmine-elec-products.com/prodinfo.asp?number=G18580 at 250 mA each at 3.6 volts (3.7 max).
8  Using Arduino / Programming Questions / LED to music on: August 28, 2013, 09:47:17 pm
I have a RGB LED and I have everything wired properly. I am looking for code that will make at least one LED go to music.

Here is some code I already have
Code:
analogWrite(r,map(analogRead(A0),0,1023,0,255));

note I just have a audio signal connected directly to the analog input.

can some one recommend, create or teach me how to make an led blink to music nicely?
9  Using Arduino / Project Guidance / Cheapest Radio on: August 22, 2013, 08:35:50 pm
I have a micro sized robot and need a radio for it that will allow 1 way communication from a PC or joystick of some sort to the robot. I just need it to send enough information to tell the robot to stop, go forward, go backwards, turn left, and turn right. I am looking for a transmitter that is small and high powered as well as cheap. I don't need much bandwidth a message to the robot about every half second is sufficient.
10  Using Arduino / Project Guidance / Re: Arduino to Scanner on: August 22, 2013, 04:41:07 am
Thank you that should be very helpful.
11  Using Arduino / Project Guidance / Re: before i buy an Arduino > NOBODY has done this yet that i know of >> on: August 21, 2013, 08:21:51 pm
As far as i know the track ball would have encoders since it can keep rotating. The game controller's thumb stick has 2 potentiometers. if you want the arduino to control the game controllers thumb stick directly you will have to use a digital potentiometer from the arduino to the thumb sticks potentiometers. the track ball's encoder would then be read from your arduino
12  Using Arduino / Project Guidance / Arduino to Scanner on: August 21, 2013, 04:49:00 pm
Is it possible to have the arduino interface to a standard USB scanner? I don't mean have it connect by USB but rather remove the imaging sensor from the scanner and plug that directly into the arduino.
13  Community / Local Groups / Re: Robotics Group (Remote Members Welcome) on: August 21, 2013, 01:17:28 pm
The "Secrecy" part may turn a lot of us off.

If you are NOT planning to make the results of this work Open Source and it will be some proprietary product, you should say so at the beginning....

Agreed I would not join this just because it is "Secret"
14  Using Arduino / Project Guidance / Re: Send TXT filles to arduino on: August 21, 2013, 01:13:16 pm
How big is the list? Can you provide more details? Its may be easier to us a PC depending on what you want. Are you thinking of using RFID ?
15  Using Arduino / Project Guidance / Re: Before the smoke starts rising..... on: August 19, 2013, 07:20:28 pm
Quote
Do use 470 Ohm to 1 K Ohm resistors between the two as a best practice.
@mrburnette

What! Why! You would not normally connect to digital chips (which use the same votage) using a resistor.

Mark

I have had this issue before how. I had one arduino on and the other powered off. with the digital pins connected directly the 1 Arduino tried to power the other Arduino which was off through the I/O pins. I always thought you had to use resistors to limit this. what method is better?
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