
A-Cute
User Manual
19
September 12, 2016
3.3.4
User Buzzer and LED
SCD placed one buzzer and two LED lights on the card; which is a device that allows the user to
control the buzzer and LED lights. These devices are using the common emitter circuit to increase
the output current.
When the user wants to turn on the LED light, adjust the signal to high and the LED lights will light
up.
If users want the buzzer to play a sound; you need to generate a frequency output to the buzzer. Please
note that the required frequency falls between 20Hz ~ 20KHz.
The Figure 3-7 shows the Connections between the GPIO and LED / Buzzer Driver.
the pin assignment of LED / Buzzer Driver connected to the DE0-Nano GPIO0
Figure 3-7 Connections between the GPIO and LED / Buzzer
Table 3-5 Pin assignment of LED / Buzzer
SCD Signal Name
GPIO
Pin No.
FPGA Pin No.
on GPIO 0
Description
I/O Standard
Buzzer
18
PIN_D6
Buzzer wave signal
OUT, 3.3V
LED_LEFT
19
PIN_A7
Left LED signal.
OUT, 3.3V
LED_RIGHT
20
PIN_C6
Right LED signal.
OUT, 3.3V