Chrono
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== Components == | == Components == | ||
The system consists of | The system consists of | ||
− | * a [[Media:Chrono.pdf|Chrono assembly]] | + | * a [[Media:Chrono.pdf|Chrono assembly]] (not up to date, to be deleted) |
+ | * a [[Chrono/assembly|chrononeter assembly]] with a stepper motor, a single hand and a Reed relay to give position 0 | ||
* 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 [[Media:Heb_lcd_schematic.pdf| | + | * a user interface board with [[Media:Heb_lcd_schematic.pdf|4 buttons and 8 LEDs]] |
==== Motor control circuit ==== | ==== Motor control circuit ==== |
Revision as of 11:44, 25 November 2013
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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.
Specification
The basic specification is the following one:
- On reset, the pointer moves to the start position (12 o'clock), it is given by a Reed sensor.
- When pos 2 button (Start) is pressed, the pointer will start counting seconds.
- When pos 3 button (Stop) is pressed, the pointer stops and waits at the actual location.
- When pos 1 button (Reset) is pressed, the pointer resets to the start position (12 o'clock).
as optional task a pos4 button (Set) can be pressed in order to halt the pointer, but the stop watch is still counting. By a second push of the set button the pointer moves to the actual stop watch time.
Components
The system consists of
- a Chrono assembly (not up to date, to be deleted)
- a chrononeter assembly with a stepper motor, a single hand and a Reed relay to give position 0
- an FPGA prototyping board
- a user interface board with 4 buttons and 8 LEDs
Motor control circuit
The Chrono Stepper motor powered with 8-12 V. The power circuit contains an H-bridge controlled by digital signals. On the power board, a 5 V regulator generates the proper voltage for powering the FPGA board.
Stepper motor
The Stepper motor is controlled by a L6207 H-bridge driver. The Stepper Motor itself has a resolution of 1.8degree (Full step) and works with 4 coils. A more detailed description about the different ways to control a stepper motor can be found here.
Hall sensors
The hall sensor is a switch which is working with the hall effect. If a magnet is close to the sensor, the contact closes. For the projects 1 hall sensors are used to identify the 12 o'clock position.
FPGA board
The main board is called FPGA-EBS and is the school's main development board. It features many different interfaces and a Xilinx Spartan xc3s500e FPGA.
For additional information see the FPGA-EBS page.
Buttons and LEDs
The Button and Led parallelboard can be attached to the FPGA-EBS and has 4 additional buttons and 8 additional leds which you can use.
Toplevel Design
Getting started
In order to start the projects you should do the following:
- Read carefully the specifications above
- Consult the guides for the first steps
Additional Information
Additional informations for collaborators