Choice of Microcontroller

Discussion in 'The Projects Forum' started by sureshparanjape, Nov 30, 2013.

  1. sureshparanjape

    Thread Starter Member

    Feb 10, 2012
    64
    2
    I have Freeduino, like Duemilanove, board with ATMega32 microprocessor.
    I have JHD 162A digital display.
    As a trial/hobby, I want to program a micro-controller, using methods described on arduino.cc website to get a digital clock.
    I am almost done with the needed sketch for it.I have two questions.

    Question 1:What is the right inexpensive choice for micro-controller for it ?

    I am still searching on internet for guidance.
    I feel that I can easily add room temperature display in it also( as it is available in a ready made digital clock.

    Question 2:Which thermistor should be used?

    I will have to modify the sketch if I decide to add thermistor (provided I can calibrate it!)
    The requirement on micro-controller is therefore
    a. one long millisecond variable, and
    b. running the sketch.
    Is this information enough for deciding micro-controller ?
     
  2. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
    463
    I think this decision must be made by the designer (means you).

    For a single circuit it does not matter- most controllers are inexpensive.

    Savings are only visible when you produce at least a few 100 PCBs.

    And 2.) use a I2C temp. sensor for instance Microchip.
    The thermistor calibration is a lot of effort.
     
  3. donpetru

    Active Member

    Nov 14, 2008
    186
    25
    1: I don't understand why almost all beginners start with Arduino when there is a more useful direction that can help more in the future professional career. For beginners and beyond, a development board like the one here:
    http://www.mikroe.com/easyavr/
    together with related software and programming the examples are given here, can help a lot more to learn how to interface different modules and use microcontrollers. Why you do not use this way?

    2
    : Uses one LM35 interfaced one of ADC pins of the microcontroller if you want MCU read and displayed the room temperature. It is the most simple and accurate method.
     
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,394
    1,606
    2. I don't understand why anyone would use an LM35 when it is a complicated mix of hardware software and calculations when you can get something like a TMP275 which does the complete conversion internally, only requiring you to read the number off a serial interface.
     
    absf likes this.
  5. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    Thats easy.. its through hole..

    another easy one.. Its $20 vs $150 and has its own simple,easy to learn ide/language plus thousands of online tutorials/example code..
     
    absf likes this.
  6. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    I don't understand why you are asking for a micro solution when you stated you have a freeduino.. use that.
     
  7. iimagine

    Active Member

    Dec 20, 2010
    129
    9
    Thats easy...the OP did not know :D
     
  8. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    Might have something to do with the $149 price tag vs <$30 for the Arduino. True, there is a lot more hardware with the Microe, but for a beginner, just a couple of externals will get someone started.
     
  9. sureshparanjape

    Thread Starter Member

    Feb 10, 2012
    64
    2
    .......
    Thanks.
    1. I read a lot on internet about choice of micro-controller. I couldn't get one that can use sketch developed by arduino board.Hence the question.
    Atmega32 cost around Rs.200(in India) and there are some at around Rs.30 or so. For a mere hobby, it is worth saving!
    I thank you for you taking out time and answering my query.It encourages and helps.
    S.R.Paranjape
     
  10. sureshparanjape

    Thread Starter Member

    Feb 10, 2012
    64
    2
    ...
    Thanks for very prompt comment/advice.
    My hobby is for learning something new for pleasure of it. The board, I am using was easily available in my city and internet search indicated that one could search for help. There is no idea of using it for any other purpose.
    I would check availability of LM35 in my city and what I would have to learn more to use it.
    Thanks again
    S.R.Paranjape
     
  11. sureshparanjape

    Thread Starter Member

    Feb 10, 2012
    64
    2
    Sir,
    I would like to experiment of making a supportive power supply of 5vcircuit , see how to program a microcontroller to go in its place in the circuit, and experience fun of making a stand alone unit ith smaller no of parts than on the development board.! It is just a hobby to see how entrepreneurs might have developed it.
    S.R.Paranjape
     
  12. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    absf likes this.
Loading...