how to configure BUZZER IN NRF51 EVB

[MARTIN FR]

Hello everyone

i am trying to configure the buzzer int he development board inordert o create the buzzer beep sound i have configured the GPIO pin 14 fir the buzzer so in the pin 14 of the developement i connected the positive to 14 and negative to gnd like that i ahve to configure or something else any suggestion will be helpful

main.c

[Ole Bauck]

You can connect the buzzer directly to the pin as it is done on the mbed Application Shield. However be aware that the maximum current that can be sourced from any pin on the nRF51 is 5 mA. It may also be less (0.5mA) if the pin is not configured in high drive. For this reason I would suggest to use a transistor in between the nRF51 chip and the buzzer.

[MARTIN FR]

Thank you so much for your reference i have attached the picture of my buzzer and alos i conencted the buzzer in the development baord please verifu that my connection is correct and also i ahve configured the gpio pin for the buzzer like this

#DEFINE BUZZER_PIN 7 nrf_gpio_config_output(7);

please let me know the feedback of my configurations

[Ole Bauck]

It is connected correct (I would suggest a transistor however). Run the PWM with a low duty cycle to avoid drawing to much current. You don't need to configure the gpio to run the PWM.

[MARTIN FR]

then if i dont need to configure the gpio to run the pwm then how can i conenct the buzzer to the respective pin? how the pwm output will make the buzzer beep sound? can i test the buzzer beep functionalities with the pwm example in sdk verzsion 9 will ti make beep sound?

[Ole Bauck]

You can confiugre it to pin 7: APP_PWM_DEFAULT_CONFIG_1CH( period_in_us, pin). It should make a beep sound if you configure for a frequency between 20 Hz and 20 KHz (hearing range). Check the datasheet of the buzzer to see if it supports this range. I would try with a frequency of say 1 KHz (1000us).

[MARTIN FR]

thank you so much for your kind reply can you guide me how to make buzzer beep for three times and tell me how to add the pwm function there in my program ?i will add the main file in my main post