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Have a question about Arduino? Ask me!

sciguy14

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Jeremy Blum

Jeremy is an Electrical and Computer Engineering Student at Cornell University. He has been building microcontroller projects since high school, from a prototype prosthetic hand with a novel control scheme, to a nerf gun that fires at the intruders and uploads their picture to the web.
  • in reply to e14 Contributor

    Hi, how i put atmega8 16PU and upload job, I see errors list: avrdude: stk500_getsync(): not in sync: resp=0x00
    avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51, what is a problem, how i can fix it. Maybe can I get skype  name a person, who can help me online?

    thanks for answer

    bye

  • in reply to e14 Contributor

    As leon_heller and WestFW have stated, you need to have a compatible microcontroller and it needs to be loaded with the Arduino bootloader. You can't just insert a new ATmega into the Arduino board and expect it to work. You should read this about bootloaders, then burn the bootloader to your ATmega IC if not already done so. Then try uploading your sketch and see how you go.

  • Hi all,  I'm also one of the new Ardunio people, and my question is about the atMega chip used as the USB to serial interface.  Is this code available, and is there a tutorial on the information that is supplied back to the computer as to the device.  What can be placed in it and so on.

     

    Regards,

     

    Dave M.

  • in reply to dmaruska

    Head over to this page:  http://arduino.cc/en/Main/ArduinoBoardUno and scroll down to the paragraph titled "Programming". There are links to the source code in the Atmel 8u2, programming and so on.

  • Hi again,  Does anyone have any code for using a MAX1239 ADC, and a MAX7300AAI+MAX7300AAI+?  Thanks...

     

    Regards,

     

    Dave M.

  • in reply to dmaruska

    Hi, who can help me in online fix problems about chip bootloder, upload, using skype? Please sent me skype nick in my private.

     

    Bye 

  • in reply to e14 Contributor

    You need an ICSP like the MKII if you want to put the arduino bootloader on a new microcontroller.  Do you have one?  They generally look like this: http://www.raphnet.net/divers/avrprog/ispMKII.jpg

     

    If not, you need to get one before you can use a new atmega in the arduino.

  • Jeremy, you might be the wrong expert to contact about this but since your an arduino exper and im utilizing an arduino uno in my project i thought i might give it a shot, im trying to build a micro cnc laser engraver, the only problem im expiriencing right now is that the stepper motors i salvaged out of an old dvd drive have no labels on the 4 contacts that come out of them, im not really sure how to connect them or how to test which terminal is which without burning anything. I also looked online trying to find any type of documentation for the motor i got but there is nothing out there, the numbers that are on it are : s42 7917c3a, im not really sure if thats a serial or model number. If you have any idea how i could test it out i would greatly appreciate your help, i will be driving them with an arduino uno and an easy driver i got from spark fun.

    thanks

    bart

  • in reply to e14 Contributor

    I think you are going to have a lot of fun with this project that you have in mind.

    The motors are probably usually driven with 12 volts from the PC, so do not try and use more than that, unless you buy some really good driver chips (either to build your own driver, its not difficult, or you buy PCBs already built and tested....) that handle current adjustment, which will allow higher voltages also to be used. Allegro make some good chips, I can recommend the Allegro family chips, especially the latest ones that do not need external sense resistors......Look at the SLA707X family of chips.

    You need to be careful in adjusting just how much current is sent to the motors, may I suggest not more than say 250 ma at first, and if the motors get hot, both cool them and use less current. The current is adjusted by setting up a specific chip voltage using a pot. The chips come in various max currents up to 3 amps per motor, you only need the chip with the lowest current range, 1 amp range.....

    Then you will need usually 3 axis for engraving, so that means 3 motors and 3 driver PCBs. (Change to 4 if needed!)

    Then, assuming you want to get going fairly quickly and have an easy interface to faultfind, go for a Parallel Printer Breakout Board (often just called a PPP) and an older (cheaper) PC with a PPP, or one where you can by a plugin card with a port on it.

    DON'T GO FOR USB, learn to walk before you run. Also USB costs far more in both $$$ and nerves!

    Then find and download an Ubuntu Unix install with EMC2 (all free from Sourceforge). Read here first:-

    http://en.wikipedia.org/wiki/SourceForge

    Join the EMC forums and get yourself up to speed.

    Look for other forums CNCZONE and the like, read all you can.

    If you buy or make a breakout PCB, make sure it has opto isolation. To read more on this, join the yahoo group:-

    http://groups.yahoo.com/group/DIY_CNC_Interfacing/

    You will eventually need to get a good CAD program, there are some free ones around. Then the drawing needs to be converted to GCode for your CNC machine. You can read more about GCode here:-

    http://en.wikipedia.org/wiki/Gcode

    If you have any further questions I and others here can help, just ask.

    regards

    Andy