how to configure BUZZER IN NRF51 EVB

RE: how to configure BUZZER IN NRF51 EVB

MARTIN FR — Tue, 15 Dec 2015 12:08:47 GMT

OKAY THANK YOU

RE: how to configure BUZZER IN NRF51 EVB

Ole Bauck — Tue, 15 Dec 2015 12:04:14 GMT

Maximum recommended voltage is 3.6V so you would not get much from that. You could probably use a P type transistor (P-channel mosfet or PNP transistor) if the reason for not using transistor was that the negative of the buzzer could not be used. Which transistor to use is not a discussion for this forum, and there are a lot of other forums that will help you with this.

RE: how to configure BUZZER IN NRF51 EVB

MARTIN FR — Tue, 15 Dec 2015 11:41:25 GMT

actually am not sure but this is an idea which i have in my mind to connect two pins together so that buzzer will get more current and sound will be louder but i will try to test with transistor is there is any other alternative ways to make more sound by using NRF51 dk ? please suggest me some possible ways (except transistor)

RE: how to configure BUZZER IN NRF51 EVB

Ole Bauck — Tue, 15 Dec 2015 11:32:02 GMT

With this code you will get a short circuit, and as explained in another post, you should not connect to pins together and use the pwm driver on both. Are you sure that the buzzer is able to make higher sound at this voltage? Could you try with a transistor or a function generator that can deliver enough current? If the buzzer makes to little sound at Vcc, you will have to have more voltage.

RE: how to configure BUZZER IN NRF51 EVB

MARTIN FR — Tue, 15 Dec 2015 10:27:39 GMT

yes i have set the duty cycle by configuring like this

app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_2CH(5000UL,6,7);//6.3KHz app_pwm_enable(&PWM1);

		app_pwm_channel_duty_set(&PWM1, 1, 70);
		app_pwm_channel_duty_set(&PWM1, 0, 50);
  nrf_delay_ms(2000);

it is making sound on pin 6 and then pin 7 and then pin 6 like this going on but how can i make the pulses on both pin simulatneously ? moreover the sound of the signal is not loud enough can you tell me is there is any other way to increase the loudnees by using nrf51 except transistor

RE: how to configure BUZZER IN NRF51 EVB

Ole Bauck — Tue, 15 Dec 2015 10:24:08 GMT

Have you called app_pwm_duty_set(..) on both channels?

RE: how to configure BUZZER IN NRF51 EVB

karan — Mon, 14 Dec 2015 10:03:06 GMT

actually i can manage all the buttons push and buzzer beep sound after pressing the button but the actual main problmr is the pwm pulses are not getting created in both channels i am using this function

app_pwm_config_t pwm1_cfg = APP_PWM_DEFAULT_CONFIG_2CH(158UL,6,7);//6.3KHz

when i connect the buzzer in two pins only the pin 6 is producing beep sound but the pin 7 showing 2.9V and if i connect the buzzer to that pin it is not producing any beep sound in the buzzer can you tell me what are the other things do i have to add or modify in ordert o create beep on both pins

RE: how to configure BUZZER IN NRF51 EVB

Ole Bauck — Fri, 11 Dec 2015 15:47:18 GMT

After detecting the button push, use app_timer to check how long the button is pushed and make the buzzer beep three or one sound. See this tutorial for app_timer.

RE: how to configure BUZZER IN NRF51 EVB

MARTIN FR — Mon, 26 Oct 2015 15:35:29 GMT

my goal is i have to press the button for 3 seconds then the buzzer make three beep sounds(advertsing starts) after that if i press the button for 5 seconds then the buzzer has to make single beep sound (advertsiing ends)

RE: how to configure BUZZER IN NRF51 EVB

Ole Bauck — Mon, 26 Oct 2015 15:31:07 GMT

You can use the app_timer module and start a timer when the button is pushed with timeout of 3 seconds and then check if the button is still pushed when the timer expires. Or do you want to make the buzzer beep the number of seconds the button is pushed? Please tell me what your goal is.

RE: how to configure BUZZER IN NRF51 EVB

MARTIN FR — Mon, 26 Oct 2015 14:19:45 GMT

yes i have did like that now i can able three beeps , i just want to make the function like press the button for three seconds then the buzzer has to produce three beep sound now i can able to manage the button part but i am struggling to mix the buzzer beep sound part with the button function please help me how to make this steps do i ahve to include any timer?

RE: how to configure BUZZER IN NRF51 EVB

Ole Bauck — Mon, 26 Oct 2015 14:02:19 GMT

Something like this:

for(int i = 0; i < 3; i++)
{
    app_pwm_channel_duty_set(&PWM, 0, 10);
    nrf_delay_ms(100);
    app_pwm_channel_duty_set(&PWM, 0, 0);
    nrf_delay_ms(1000);
}

RE: how to configure BUZZER IN NRF51 EVB

MARTIN FR — Fri, 23 Oct 2015 14:09:07 GMT

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

RE: how to configure BUZZER IN NRF51 EVB

Ole Bauck — Fri, 23 Oct 2015 13:28:27 GMT

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).

RE: how to configure BUZZER IN NRF51 EVB

MARTIN FR — Fri, 23 Oct 2015 13:04:58 GMT

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?

RE: how to configure BUZZER IN NRF51 EVB

Ole Bauck — Fri, 23 Oct 2015 13:02:18 GMT

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.

RE: how to configure BUZZER IN NRF51 EVB

MARTIN FR — Fri, 23 Oct 2015 12:47:07 GMT

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

RE: how to configure BUZZER IN NRF51 EVB

Ole Bauck — Fri, 23 Oct 2015 12:38:16 GMT

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.