Send battery information with bluetooth to arduino appinventor batteryextension

[Xavi]

Hello .

I've only been with app inventor for two days and I still do not know how it works. I'm using app inventor with battery extension.

And I want to send the information of the battery level and the voltage by bluetooth to a arduino device and I can not do it

thanks to all.

[Andres Daniel]

puedes describir tu proyecto y que quieres realizar

[Xavi]

I want to make a smart charger that connects with bluetooth with a cell phone or tablet. When the battery is almost full (70-80% or 4,200 mV) send a signal to the Arduino and this activates an output with a relay to disconnect the current and when the battery is at 30% recharge the battery

Hola Andres, quiero hacer un cargador inteligente que se conecte con bluetooth con un movil o tablet. Cuando la batería este casi llena (70-80% o con 4.200 mV) envié una señal al arduino y este active una salida con un rele para desconectar la corriente  y cuando la batería este al 30% vuelva a cargar la batería 

[Abraham Getzler]

There are sample BlueTooth/Arduino projects in this FAQ:

https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/mitappinventortest/2cd6Uz__xA0/cPQSiZpcDAAJ

ABG

[Ghica]

But be aware that App Inventor cannot run in the background. That may be a showstopper for your project.
Cheers, Ghica.

[Andres Daniel]

si se puede

[Xavi]

Hello finally i did it! but now i do this app and i don't know the app in my phone crush...

[Ghica]

That is not surprising. You did something completely terrible: a while test with a condition that may or may not end. You are sending messages to your BT device like gunfire instead of once per second (or whatever interval you have set) when the Timer goes of.
Replace the while test with if..then and you should be fine. You can also use just one clock by placing both ifs below each other, or if you want to be really fancy, use if-then-else
Cheers, Ghica.

[Xavi]

You're right Ghica

I realized before but thank you very much. Thanks to you I improved the app! thank you