Chrono

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The chrono project is an ElN project done at the end of the first semester.
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The Chrono project is an ElN project done at the end of the first semester.
It consists in conrtolling a stepper motor which moves a pointer in a clockwise direction. It will emulate a stop watch.
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It consists in controlling a stepper motor which moves a hand in a clockwise direction.
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This emulates a stop watch.
  
 
[[File:Chrono.jpg|600px|Chrono in Action]]  
 
[[File:Chrono.jpg|600px|Chrono in Action]]  
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The basic specification is the following one:
 
The basic specification is the following one:
* When the ''restart'' button is pressed, the pointer turns back to the starting position (12 o'clock), which is indicated by a Reed relay.
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* When the ''restart'' button is pressed, the hand turns back to the starting position (12 o'clock), which is signaled by a [https://en.wikipedia.org/wiki/Reed_relay Reed relay].
* When the ''start'' button is pressed, the pointer will move by 1/60<sup>th</sup> of a full turn every second.
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* When the ''start'' button is pressed, the hand will move by 1/60<sup>th</sup> of a full turn every second.
* When the ''stop'' button is pressed, the pointer stops and waits at the current location.
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* When the ''stop'' button is pressed, the hand stops and waits at the current location.
  
 
The minimal system doesn't handle the cases when the user acts erratically,
 
The minimal system doesn't handle the cases when the user acts erratically,
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The system consists of
 
The system consists of
 
<!--* a [[Media:Chrono.pdf|Chrono assembly]] (not up to date, to be deleted)-->
 
<!--* a [[Media:Chrono.pdf|Chrono assembly]] (not up to date, to be deleted)-->
* a [[Chrono/assembly|ChronoMeter assembly]] with a stepper motor, a single hand and a Reed relay to give position 0
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* a [[Chrono/assembly|chronometer assembly]] with a stepper motor, a single hand and a [https://en.wikipedia.org/wiki/Reed_relay Reed relay] to signal position 12 o'clock
 
* an [http://wiki.hevs.ch/uit/index.php5/Hardware/FPGAEBS FPGA prototyping board]
 
* an [http://wiki.hevs.ch/uit/index.php5/Hardware/FPGAEBS FPGA prototyping board]
* a user interface board with [[Media:Heb_lcd_schematic.pdf|4 buttons and 8 LEDs]] or with [http://wiki.hevs.ch/uit/images/6/6b/FPGA_PP_HEB_lcd_v2_schematic.pdf 4 buttons, 8 LEDs and a LCD]
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* a user interface board with [http://wiki.hevs.ch/uit/index.php5/Hardware/Parallelport/heb_lcd 4 buttons and 8 LEDs] and an optional LCD
  
 
== Design ==
 
== Design ==
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== Additional Information ==
 
== Additional Information ==
Additional informations for [[Chrono/professor|collaborators]]
 
  
 
* [[chrono/survival guide|Survival guide]]
 
* [[chrono/survival guide|Survival guide]]
* [[chrono/board combination|Board Combinations]]
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* [[chrono/board combination|Board combinations]]
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* Additional informations for [[chrono/teachers|teachers]].
  
 
[[Category:Bachelor]] [[Category:ElN]] [[Category:Chrono]]
 
[[Category:Bachelor]] [[Category:ElN]] [[Category:Chrono]]

Revision as of 17:03, 4 December 2015

Contents

The Chrono project is an ElN project done at the end of the first semester. It consists in controlling a stepper motor which moves a hand in a clockwise direction. This emulates a stop watch.

Chrono in Action

Specification

Minimal system

The basic specification is the following one:

  • When the restart button is pressed, the hand turns back to the starting position (12 o'clock), which is signaled by a Reed relay.
  • When the start button is pressed, the hand will move by 1/60th of a full turn every second.
  • When the stop button is pressed, the hand stops and waits at the current location.

The minimal system doesn't handle the cases when the user acts erratically, such as pushing the restart button when the hand is already at 12 o'clock position.

Options

The students are given the opportunity to design a more complex system. Two buttons, 10 LEDs and optionally a 4-line LCD display allow to debug or to add functionalities.

Optional functionalities already seen are:

  • PWM: when the hand is stopped, the current in the corresponding coil can be reduced using a repetitive pattern
  • counting minutes: whilst the hand shows the seconds, the minutes can be displayed on the LEDs
  • smart restart: the direction for moving the hand back to the 12 o'clock position can be chosen in function of its actual position
  • lap time: when the hand is stopped, a counter still counts the seconds and a further button press drives the hand as fast as possible to the current time.
  • LCD display: the LCD can be used to display information such as the minutes. An LCD IP Core for the display communication is provided.

The LCD comes with a control block to which one can send an ASCII character to. Control characters allow to navigate on the LCD display.

Components

The system consists of

Design

Toplevel Block

Getting started

In order to start the projects you should do the following:

Additional Information

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