D-Link DSL-G684T Manual de usuario descargar pdf (Pagina 27)

two legs, connection pin to voltage, so that we read a HIGH. For the convenience of the

user additional LED is placed into the circuit. When button is closed LED starts to blink. In

addition, when reset takes place LED blinks 3 to 6 times fast in a row to confirm.

Servomotor pins

To control servos simple connection consisting of three cables is needed. Ground,

power and control signal. I have placed two sets of

pins directly to control two servos. With simple

modification of software more servomotors can be

connected to the board.

Photocell pins

In order to connect photocell voltage divider

is needed. In this case 10k resistor was used.

To cope with the high sensitivity of the

photocell the concept of hysteresis was used. Based on experimental deduction the delay of

set.

Main chasing

It was designed to protect electronic

parts from light damage that might appear

during transport or presentation. Two 3mm

thick transparent plexi plates for top and bottom

makes it very useful in educational application.

In top cover additional holes for led, headers,

servo/photocell pins and wifi antenna connector

were cut.

BlackBox photocell

To present example application photocell was needed. A

photocell is a type of resistor that reacts with the light. When it is

strike by light, cell allows current to flow more freely. However, in

Figure 17. Sockets of the BlackBox

Figure 18. Chasing of the Control System

Figure 19. BlackBox’es

photocell

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D-Link DSL-G684T Manual de usuario Pagina 27