RE: Connecting a Low Power Buzzer to a GPIO on nrf51 DK (PCA10028)

Joseph Ayuk — Wed, 10 Apr 2019 16:18:30 GMT

Thanks for the reply Marjeris Romero, I have understood how it works

RE: Connecting a Low Power Buzzer to a GPIO on nrf51 DK (PCA10028)

Marjeris Romero — Tue, 09 Apr 2019 08:14:17 GMT

Hi Joseph,

You can use PWM to generate sounds with a piezo buzzer. You will need to change the frequency and/or duty cycle to make different pitches/tones. To make a simple melody you can play one tone for a fixed number of seconds, then change to a different tone for a fixed number of seconds, and so on, using an app timer to generate the PWM output. For a starting point, take a look at the PWM library example in our SDK here.

The example uses 2 channels, and drives GPIO pins 17 and 18, which connects to LED1 and LED2 on the DK. For 1 channel PWM use APP_PWM_DEFAULT_CONFIG_1CH instead.

The increase in power consumption will depend on how much is the current draw from the buzzer and how long do you plan to play the tunes.

Best Regards,

Marjeris