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Author Topic: Warning/indicator LED's and buzzer  (Read 2401 times)

Offline Paulham

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Warning/indicator LED's and buzzer
« on: January 17, 2013, 19:20:24 »
Hi guys,
Isit possible to wire some LEDs into the aio pro board so that armed status and gps fix is easily seen , also a buzzer would be good?

Simular to this http://diydrones.com/profiles/blogs/led-low-battery-warning-on

Thanks
Paul

Offline bunnygirl80

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Re: Warning/indicator LED's and buzzer
« Reply #1 on: January 17, 2013, 22:25:27 »
Hi Paul,

You can connect your own buzzer, but you have to be careful that you don';t overload and damage the FC board. This is why it says on the board plans not to connect a buzzer directly. The boards are normally 5v, the buzzer can vary but as an example might be 3v. So, there is a 2v surplus. You have to use Ohm';s Law to work out what resistor you need to use the buzzer. Ohm';s Law states Resistance = Source Voltage - Sensor Voltage / Current of Sensor. So, FC board is 5v - Buzzer 3v = 2v / Buzzer 10mah = 200ohm Resistor. You can put the resistor either side of the buzzer cables. Once you';ve done this, just enable the BUZZER code in your FC software. I';m in the middle of enhancing the standard MultiWii software to add tones and volume to indicate things.

Good luck.

Always smile because you never know who could be falling in love with it. :) Drone Operator in North Wales. www.aerialworx.co.uk