Vermes
Advanced Member level 4
It is a device perfect for car racing – an electronic switch which facilitates measuring the time. The device can operate with a chronometer and one photocell. It comunicates with a computer and start lights via RS232. There are two possible ways to measure the time: with computer and without it.
Time measure without use of a computer:
To start with start light, you need to have: a chronometer, photocell, start lights. After pressing the button, the green diode is lit.
To start the lights, press the button once again and hold it for 3 seconds. After lighting the green light, the barrier interrupt starts time measure on chronometer, and the green diode is off. Before the finishing line, press the button in order to activate the photocell – then the red diode is turned on.
Since then, interupt of the barrier will end the measure on chronometer, and the red diode is turned off.
When you want to start without lights, you need: [/b] a chronometer and photocell. Pressing the button turns on the green diode and activates the photocell. Since then, the barrier interrupt turns on measuring the time on the chronometer. Pressing the button switches the red diode and activates the photocell. From that moment, the barrier interrupt stops measuring the time on the chronometer.
Time measure with use of a computer - to measure the time with lights, you need to have: a computer and start lights (the driver measures the time, so there is no chronometer). Just turn on any emulator of port com, for example the same as in Bascom.
Then enter the number of a racer and confirm it by pressing ENTER. You also have to press ENTER to start the lights (everything is displayed in the emulator to facilitate measuring the time). When the green diode lights, driver's reaction time measuring is started. Measuring that time is stopped after the is interrupted and then measuring the time of the course starts. Befor the finishing line, press the button on the driver to activate the photocell. After the barrier interrupt, time is stopped with displayed on the computer screen. Accuracy of the course time is 0,01s, while the driver's reaction time is 0,001s. Barrier interrupt before lighting the green diode displays additionally „FALSE START” at the end of a course.
To measure course without start lights: press the button on the driver, the green diode lights and the photocell is activated. Barrier interrupt starts measuring the time. Another pressing the button turns on the red diode and activates the photocell. Barrier interrupt stops the measuring and time is displayed on the computer display. Driver's reaction time is not measured.
You can connect two start lights to the driver.
Link to original thread (useful attachment) - Elektroniczny przełącznik ułatwiający pomiar czasu
