Chrono

From FSI
Revision as of 10:10, 26 November 2013 by Cof (Talk | contribs)
Jump to: navigation, search

Contents

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.

Chrono in Action

Specification

Minimal system

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.
  • When the start button is pressed, the pointer will move by 1/60th of a full turn every second.
  • When the stop button is pressed, the pointer 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 and 10 LEDs 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
  • lap time: when the hand is stopped, a counter still counts the second and a further button press drives the hand as fast as possible to the current time.

Components

The system consists of

Design

Toplevel Block

Getting started

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

Additional Information

Additional informations for collaborators

Survival guide

Personal tools
Namespaces
Variants
Actions
Navigation
Modules / Projects
Browse
Toolbox