I work on a project which uses an arduino mini pro, a bluetooth module, a FTDI board to program and a coin battery holder.
I was wondering how I have to solder the battery.
The bluetooth module is connected at the VCC en GND from the arduino. I still want to use the FTDI for testing purposes.
What is the best way to solder the coin battery?
What is the best way to solder the coin battery?
Never, never, never, try and solder a coin battery. It will at best destroy the battery and at worst will cause it to explode.
Use a battery holder clip to electrically attach it.
Sorry I'm new to hardware. I meant were I have to solder the battery holder.
In which case I don't understand the question.
Do you mean there is no place on the board to fix the battery holder?
If so then you need to use either a bit of prototyping strip board or put the holder on flying leads.
That's a good idea, thank you. Do I have to attach the coin battery holder wires to the raw and ground from the arduino? Can there be 2 wires at one ground?
Do I have to attach the coin battery holder wires to the raw and ground from the arduino?
Not sure where the positive needs connecting as I haven't seen the schematic, but the negative should be connected to ground.
Can there be 2 wires at one ground?
Yes you can have as many wires as you like on a ground connection.
The "RAW" pin is the input to a voltage regulator. A battery (or any appropriate voltage source) can be connected to the "Vcc" pin. See the schematic from Sparkfun: http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Dev/Arduino/Boards/Arduino-Pro-Mini-v12.pdf
I'm confused - a coin battery isn't going to be powerful enough is it?