Show Posts
Pages: [1] 2 3
1  Products / Arduino Due / Re: Power Arduino DUE board from 3 AA batteries: suggestions ? on: May 24, 2014, 12:49:22 am
Since no one has answered your question, I thought I would give it a shot.
According to the schematics, each USB power line is isolated with A MOS FET.
The voltage used will be the higher of the two voltages. No feedback
should occur.

Hope this helps.
2  Products / Arduino Due / Re: Power Arduino DUE board from 3 AA batteries: suggestions ? on: May 14, 2014, 03:55:34 pm
First of all not everything on the due runs at 3.3 V. The USB chips require 5V 
You can power the due directly off the USB port. But don't expect it to run a display or a lot of other gear.
You can run the due office 6v battery pack, But it requires for batteries minimal.
The regulators will accept that voltage, But it is a little close to the regulated output for me.
It is best to use a 7.5V battery pack or 9V Regulated power supply that can handle at least 1 amp.
The problem with battery packs is they rundown. And you have to replace the batteries.. This is fine
for a project that does not have access to any other power source. But if you have access to a power source,
you're better off using a 9V Regulated power supply.

Hope this helps.
Joe.
3  Products / Arduino Due / Re: Arduino Due 7" TFT LCD touch screen problems on: May 14, 2014, 01:07:21 am
First of all,  you're not using a CTE display. Check your pinouts to make sure they are compatible.
Next: if the display is compatible, use the CTE70 display not a CTE50.
The numbers after the display coincide with the SPI port. Double check these to make sure they are correct.
Finally, make sure that your touchscreen pens are in the same place as on the CTE board.
Any discrepancy can cause problems.
Make sure that you set up the calibration screen correctly with the proper CTE screen size.

Hope this helps.

Sam.
4  Products / Arduino Due / Re: SPI Issue on: April 20, 2014, 11:54:46 am
I'm still pretty new at Arduino programming, And this may not have anything to do with your problem. But I noticed one thing in your program. You set up pin 32 As an output along with pin 10 Before you used it. But I see no such declaration for pin 4. Was this just an oversight in your description of the program, or have you forgotten to declare that pen function. 

Joe.
5  Products / Arduino Due / Re: Due pinout diagram on: April 03, 2014, 10:49:16 am
Thank you very much, this should help tremendously.
And I'm sure others will appreciate it just as much as I do.

Sam.
6  Products / Arduino Due / Re: How to generate SINE PWM on: March 20, 2014, 12:33:54 am
I understand the fun of hacking something to do something else. Your mention of the Holley carburetor is not really applicable, since the Holley carburetor was designed to do one thing, deliver the proper amount of fuel versus air mixture.. No matter how much you tweak it, it does the exact same thing as it was designed to do. Nothing more.
No microcontroller can be all things to all needs. There's always going to be something that it needs help with. And that's all I'm suggesting.

Even if he does not use a chip of this type, if this type of control is what he needs, At least we will better understand what his needs are.

Joe.
7  Products / Arduino Due / Re: How to generate SINE PWM on: March 19, 2014, 11:20:58 pm
Not sure exactly what you're trying to do, and from what I have read not many that has responded understand it either.
I do know that PWM Voltage control is directly related to the current draw Versus the current input in the circuit. The voltage is maintained by maintaining the current input.
Not directly regulating the voltage.

There are ICs out there that I believe will do what you need. This one might work for you.
http://www.ebay.com/itm/FCM8282-x2-3-Phase-Sinusoidal-Brushless-DC-motor-controller-FCM8282QY-/181228852417?pt=LH_DefaultDomain_0&hash=item2a3214d4c1.

Note: I have no information on this chip other than what the website gives me. This is just an example of what is out there. And at that price it should be cheap enough to experiment with.

Hope this helps.

Joe.

8  Products / Arduino Due / Re: How to generate SINE PWM on: March 19, 2014, 01:46:21 pm
I haven't been following this thread much, but if you're trying to drive a three phase motor, you need three equally spaced phases to do it. The Arduino due will only give you two.

Variable frequency drives very the frequency Of three sine wave generators. They do not actually use PWM. 

My advice is to change the motor to a single phase or DC motor. Or get a external Sine wave generator that will produce three Phase.
Joe.
9  Products / Arduino Due / Re: Due pinout diagram on: March 09, 2014, 07:51:25 pm
The spreadsheet is nice, But if the spreadsheet was all that was needed, this thread would never have been started.
the graphical representation of the board that is presented here is much easier to read and understand.
Being able to see and to locate each pen and its corresponding use is much better than a spreadsheet.
Although a spreadsheet can display more data, is just not the same.

Thank you for your reply and I will look over the spreadsheet.

Joe.
10  Products / Arduino Due / Re: Due pinout diagram on: March 09, 2014, 01:55:55 pm
Just wanted to thank you for putting out this diagram. It has helped a lot.

But I would like to have one addition to this diagram. The addition of quadrature inputs would be a great help.

Also, if you can make a second diagram that listed the primary pin designations and has a empty box so that the user can designate what pens are used for what purpose in their project, it would be very helpful.


Again, thank you, it has been a great help.

Joe.
11  Products / Arduino Due / Re: Frequency detection works with Uno, not with Due on: March 08, 2014, 01:27:43 pm

First of all, like you I am just beginning to work with the DUE. I'm not a programmer, just a hobbyist. So take everything I say with a grain of salt and investigate for yourself.

First let's talk about the differences between the standard Arduino platform and the DUE.

Port mode: although you can use port modes, they are intended for byte transfer of data. In my opinion Port mode should not be used for setting or resetting a individual pens. If anything else is hooked up to that port, it could have devastating effect on the accuracy of your data. When you declare that you're going to use pen mode, you should not use port mode. Always use the mode that you declare, and in the same context.

Timers: most Arduino's only have 1 timer. The DUE has several. You need to select which Timer you need to use.
The dude is not assume that you want to use any particular timer.

ADC: instructions used for the standard Arduino's is not the same as the DUE. For that reason all of your ADC errors are being seen as variables not instructions.

Interrupts: for most Arduino's, There are only a few interrupt Capable pens. Globally setting these interrupts and clearing them is not a problem. However on the DUE, every pen is interrupt ready. Globally setting these pens could have A devastating effect on any input. So global functions do not work on the DUE. Each needs to be set and reset individually.

You need to go through the tutorial for the Arduino due. Read it carefully and practice the examples until you understand how it works.

Hope this helps.

Joe


12  Products / Arduino Due / Re: Arduino Due - Compatibility with HDMI? on: February 28, 2014, 12:38:28 pm
If you need an HDMI output, And Arduino Compatibility, Try the pcDuino2.
https://www.sparkfun.com/products/12749.

 Features:

    1GHz ARM Cortex A8 CPU
    GPU: OpenGL ES2.0, OpenVG 1.1 Mali 400 core
    1GB DRAM
    Onboard Storage: 4GB Flash, microSD card (TF) slot for up to 32GB
    Arduino-Style Peripheral Headers
    HDMI Video Output
    Linux3.0 + Ubuntu12.04 and Android ICS 4.0 Supported
    0.1" Spaced GPIO Headers
    RJ45 Ethernet Connection and On-Board Wi-Fi Module
    Power Requirements: 2A @ 5VDC
    API to access the following interfaces:
        UART,  ADC, PWM, GPIO, I2C, SPI.
    Program in C, C++ with GNU tool chain
    Java with Android SDK
    Python

Joe.
13  Products / Arduino Due / Re: Arduino Due 2.8" TFT touch shield v1.0 from seed studio on: February 23, 2014, 12:42:36 am
I will give you the same advice I gave In another post Today.

First of all, I recommend using this shield that is compatible with the DUE.
"http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=121057447668".
It is compatible with both Standard 40 pin And 32 pin Displays. Make sure you check the pin out before you purchase.
It eliminates most of the compatibility problems that arise along with all the jumper wires that would be needed.

There is also a list of compatible boards that is in that Size and price range In the listing. Most of these boards are UTFT Library compatible.
Check with  "http://henningkarlsen.com/electronics/library.php?id=66" For compatibility list.

The link listed above has a touchscreen Library that may work with your display. Check the compatibility page.

Hope this helps.

Joe.
14  Products / Arduino Due / Re: Arduino DUE TFT screen compatibility on: February 23, 2014, 12:36:35 am
First of all, I recommend using this shield that is compatible with the DUE.
"http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=121057447668".
It is compatible with both Standard 40 pin And 32 pin Displays. Make sure you check the pin out before you purchase.
It eliminates most of the compatibility problems that arise along with all the jumper wires that would be needed.

There is also a list of compatible boards that is in that Size and price range In the listing. Most of these boards are UTFT Library compatible.
Check with  "http://henningkarlsen.com/electronics/library.php?id=66" For compatibility list.

Hope this helps.

Joe.
15  Products / Arduino Due / Re: 3.3v logic levels interface with standard TTL/CMOS logic - How to do it... on: February 07, 2014, 01:52:28 am
Follow-up to previous post: although I have been dealing with logic circuits since the mid-70s, I admit I am not up on the most current logic circuit family. So I decided to do some research and I came up with this:

http://en.wikipedia.org/wiki/7400_series

Scroll down to the lower two thirds of the page and you will find a chart giving various parameters of each logic circuit family up to about 2004. These parameters include logic family, circuit speed, voltage requirements and current draw. Interesting enough that the fastest chip that was listed here was the 74 "G" series which is a TTL circuit running at 1.125 GHz.

I just thought this might help someone when choosing logic circuits for their Arduino project.

Joe.



Pages: [1] 2 3