Difference between revisions of "MiniMexle"

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Minimexle is an universal development board for Atmel AVR microprocessor ATmega88, which comes with an
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[[Image:MexleBanner.png]]
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'''MiniMexle''' is an universal development board for Atmel AVR microprocessor ATmega88, which comes with an
 
USB programmer, both in the form of the kit. Both programmer and the board are available from the
 
USB programmer, both in the form of the kit. Both programmer and the board are available from the
 
[http://www.minimexle.de/ www.minimexle.de], all documentation is there.
 
[http://www.minimexle.de/ www.minimexle.de], all documentation is there.
  
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The '''MiniMEXLE''' is the youngest child of the MEXLE family. Although it offers many nice features. The device can be connected to a personal computer using the AVR USB Progi.
  
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<P Align="center">
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[[Image:MiniMexleBoard.jpg|400px|center|Vývojová doska MiniMEXLE.]]
  
== Building ==
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<P>
 
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'''Processor:''' ATmega48/88  <BR>
Although on the Mexle website You can find the complete step-by-step manual of the board
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'''User interface:''' 2-lines LCD-Display, 4 Buttons <BR>
population, we present here our ideas. Instead of building the whole board on the one step,
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'''Analog interface:''' 2 A/D and D/A-channels  <BR>
we start with the blocks, which can work independently.
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and many '''more...''' <BR>
 
 
First we start to build power supply (i.e. C1-C4, R2, D1, D2, LED, connector X1, test pins
 
and power supply stabilizer 7805). If You plan to use this board on battery powered applications, You
 
can immediately replace 7805 stabilisator with low-drop version e.g. National Semiconductor
 
LM2940CT-5.0.
 
 
 
After completing test the power supply immediately. See the Fig. 20 and 21 in the
 
[http://www.minimexle.de/shop/pub/Bauanleitung%20MiniMEXLE%20V3.0.pdf manual] to
 
find all the points where the voltage should be measured.
 
 
 
<span style="color: red">Error: The +5V is on the wrong pin in the Fig. 20 manual v3.0.</span>
 
 
 
 
 
Next step is to populate board with the all necessary power filter capacitors, reset circuit and
 
an oscillator circuit together with a processor socket. Also the connectors SV1 (ISP Programmer)
 
and SV2 (processor pins) are on the place.
 
Without processor on the place test the function of the Reset circuit.
 
Then You can insert the processor and using the AVR-USB-PROGI You can check if the programmer
 
is able to read configuration fuses and device signature.
 
If Yes, then the board is good and You can finish the board population.
 
  
<span style="color: red">Error: The jumper labeled SJ3 on the board is labeled SJ2 in the
 
schematic diagram on p. 7 in  manual v3.0.</span>
 
  
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The '''MiniMEXLE''' is currently in use at Heilbronn University and Slovak University of Technology in Bratislava
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to support students understanding microcontrollers.
  
  
== Changes ==
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Further information is available at the Software, Projects and Downloads section.
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This device may be purchased at the external [http://www.minimexle.de MiniMEXLE Shop].
  
  
Following changes were realized on my board to improve it:
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== Introduction ==
  
1. Low-drop version of the stabilisator is used
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* See the [http://www.robotika.sk/holls/2008/doc/Gruhler2008_IntroductionMEXLE.pdf presentation].
  
  See http://www.national.com/mpf/LM/LM2940.html
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== Technical documentation ==
  
2. Display is equipped with pins, board with holes. This enables to use the display
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* [[Media:MiniMexle_schematic.jpg|Schematic diagram]]
also with a solderless breadboard. Also the holes in the MiniMexle board makes easier
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* [http://ap.urpi.fei.stuba.sk/sensorwiki/images/6/63/MiniMexleSchematic.jpg Schematic diagram v3.0]
to connect wires to the breadboard.
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* [[Media:MiniMexle_manual.pdf|Building manual]] (EN, v2.0/2006)
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* [[Media:MiniMexle_manual3.pdf|Building manual]] (DE, v3.0/2006)
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* Microprocessor [http://www.atmel.com/images/doc2545.pdf datasheet] (atmel.com)
  
[[Image:MiniMexleLCD.jpg]]
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* MiniMexle Board [[Media:MiniMexleTestProgram.hex|test program (.hex)]]
[[Image:MiniMexleDisplay.jpg]]
 
  
3. For the same reason I used three holes on the place of the SV3 connector.
 
  
4. I did not use the RC filter on the PWM outputs, i.e. don't solder the capacitors C16 and C17
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See also notes to the [[MiniMexle board building]].
and use wire instead R20 and R23. It is important if You plan to use PWM outputs for motor
 
control.
 
  
5. For easier interfacing with a serial communication link I did change slightly the SV4 connector
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[[New life for MiniMexle]]: an Arduino compatibility.
  
[[Image:MiniMexleSV4.png]]
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== White papers ==
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* Pospiech, T. and Knot, J. and Gruhler, G.: ''[http://www.radio.feec.vutbr.cz/ra2010/archive/ra2006/abstracts/086.pdf MiniMexle – The Microprocessor Development Board for Everyone]''. Proceedings of the Radioelektronika 2006 conference. April 2010, Brno.
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* Pospiech, T. and Gruhler, G.: ''[http://www.hochschuldidaktik.net/documents_public/7._TdL_2007_-_Technik_129.pdf MiniMEXLE – ein studentengerechtes µC-System].''  7. Tag der Lehre 2007, Fachhochschule Biberach.
  
6. And finally, I used the rubber stamps on the bottom to save my table
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== Remote controlled mobile robot using MiniMexle board in few steps: ==
  
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# [[MiniMexleIO|Basic I/O operation]]
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# [[MiniMexleServo|Minimexle and servomotor]]
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# [[MiniMexleSerial|Basic serial communication]]
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# [[MiniMexleBT|Bluetooth serial communication]]
  
I did also change the connection of the SV4 connector in order to have the serial link
 
on the three successive pins, which makes easier external connections.
 
  
[[Image:MiniMexleV30changes.png]]
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[[Category:Mexle]]

Latest revision as of 14:00, 5 December 2013

MexleBanner.png

MiniMexle is an universal development board for Atmel AVR microprocessor ATmega88, which comes with an USB programmer, both in the form of the kit. Both programmer and the board are available from the www.minimexle.de, all documentation is there.

The MiniMEXLE is the youngest child of the MEXLE family. Although it offers many nice features. The device can be connected to a personal computer using the AVR USB Progi.

Vývojová doska MiniMEXLE.

<P> Processor: ATmega48/88
User interface: 2-lines LCD-Display, 4 Buttons
Analog interface: 2 A/D and D/A-channels
and many more...


The MiniMEXLE is currently in use at Heilbronn University and Slovak University of Technology in Bratislava to support students understanding microcontrollers.


Further information is available at the Software, Projects and Downloads section. This device may be purchased at the external MiniMEXLE Shop.


Introduction

Technical documentation


See also notes to the MiniMexle board building.

New life for MiniMexle: an Arduino compatibility.

White papers

Remote controlled mobile robot using MiniMexle board in few steps:

  1. Basic I/O operation
  2. Minimexle and servomotor
  3. Basic serial communication
  4. Bluetooth serial communication