# Buzzer activation after xx minutes of up time
**URL:** https://forum.amebaiot.com/t/buzzer-activation-after-xx-minutes-of-up-time/744
**Category:** SDK
**Created:** [August 16, 2021, 1:31am UTC](https://forum.amebaiot.com/t/buzzer-activation-after-xx-minutes-of-up-time/744 "2021-08-16T01:31:10Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@brcisna](https://forum.amebaiot.com/u/brcisna)
#### Post date: [August 16, 2021, 1:31am UTC](https://forum.amebaiot.com/t/buzzer-activation-after-xx-minutes-of-up-time/744/1 "2021-08-16T01:31:10Z")
Hello All,
–Calling all coders---- đŸ™‚
Trying to utilize the rtlduino rtl8720dn as best as i can in a drone application. Along with acting as a wifi repeater, would like for the rtlduino to activate a buzzer after 45 minutes of powered up time. In other words most drones should be done flying after at max 30 minutes uptime. This is kind of a simplistic approach to being a lost drone locater,with no user intervention. This is probably an easy coding task,for someone much smarter than I.
Thanks
---
### Author:  [@xidameng](https://forum.amebaiot.com/u/xidameng)
#### Post date: [August 16, 2021, 1:47am UTC](https://forum.amebaiot.com/t/buzzer-activation-after-xx-minutes-of-up-time/744/2 "2021-08-16T01:47:53Z")
You may use `timer` to track the time elapsed since power up, example code are also in the SDK,
>
---
### Author:  [@brcisna](https://forum.amebaiot.com/u/brcisna)
#### Post date: [August 16, 2021, 1:53am UTC](https://forum.amebaiot.com/t/buzzer-activation-after-xx-minutes-of-up-time/744/3 "2021-08-16T01:53:01Z")
Hi xidemeng,
Thank You for this . Perfect. I overlooked this looking through the ambd\_sdk.
I will try and learn something from this.