Hi,
I am setting up a Mini Pro (5V, 16MHz), with the following Bluetooth module:
It is either HC-05, or HC-06, so I was hoping that feeding 3v3 would be enough to power the module on the breadboard, but it is not cutting it.
The module works fine when used with a Bee shield.
Do I need to connect any pins other then Vcc/GND/Tx/Rx?
When I measure the voltage between pins 1(Vcc) and 10(GND), I get roughly 3V3/2.
Any schematics would be appreciated.
Thanks.
TIGOTAS:
When I measure the voltage between pins 1(Vcc) and 10(GND), I get roughly 3V3/2.
Since it works with the Bee shield, that sounds like your 3v3 source cannot supply enough current to power the BT module. Where are you powering it from?
I am powering it with a voltage divider of 33 Ohm and 132 Ohm.
TIGOTAS:
I am powering it with a voltage divider of 33 Ohm and 132 Ohm.
You can use a voltage divider for data signals into a input pin because the pin impedance is very large. Therefore a very small current flows into the pin, so the overall voltage divider ratio stays the same.
You cannot use a voltage divider to power an active circuit. The power especially for radios fluctuates very fast and therefore the voltage divider ratio is changed all the time, making the supply voltage to your active circuit fluctuate. That is one reason we use voltage regulators. They keep the voltage constant while the current drawn can change.
