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]

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.

[karan]

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

[Ole Bauck]

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

[MARTIN FR]

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

[Ole Bauck]

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.