Hi,
I'm using a 9V battery to power my arduino pro mini.
I want to add to it a bluetooth module (HC-05) to be able to communicate wireless.
The problem is that the HC-05 accepts only from 3.6V to 6V.
My skill in electronic are not good enough to solve this problem. How to reduce the current from 9V to 5V to protect the HC-05. Or is it not necessary?
Thanks
Actually you need 3.3V for the RXD for the HC-05.
It's working when I power the HC-05 with the alimentation from the USB so 5V.
You can take a look at this image.
Thanks
Which Mini are you using? 3.3v or 5v? if you have the 3.3v model then no issues BUT if its the 5v model then you need to step down the tx (From Mini) to RXD on the HC-05.
The other thing I would suggest is that you do not use 9V batteries for any Arduino type projects, they simply do not last, they are designed for very low drain devices only.
Kiwi_Bloke:
Which Mini are you using? 3.3v or 5v? if you have the 3.3v model then no issues BUT if its the 5v model then you need to step down the tx (From Mini) to RXD on the HC-05.The other thing I would suggest is that you do not use 9V batteries for any Arduino type projects, they simply do not last, they are designed for very low drain devices only.
Hi Kiwi_Bloke,
Thanks for your feedback. I'm using the 5V Mini. So far I was using one of these battery to power-up my Arduino, what would be the best one for me then that could also enable me to power-up my bluetooth transmitter?
I would never use a 9vdc Battery like that, they simply do not last any length of time. Depending where you are using your device (when its finished) I would buy either a AA battery holder I have these in 3, 4, or 6 battery sizes which allows 4.5, 6 or 9 volts to my projects. For longer run, permanent installations indoors I would look at rechargeables, for outdoors projects a larger rechargeable with a Solar Panel setup
