I am trying to send commands from my computer to my arduino robot, but the Bluetooth device drops the connection as soon as I plug the servo’s into the VCC on the arduino.
Hardware:
Arduino Mini pro
Bluetooth Mate
I have the battery (4 AA) connected to the RAW and GND.
The Bluetooth Mate is connected to the Arduino with a 6-pin right angle connector.
The servo’s connect to the D2-4 pins, GND and VCC (+5V).
I am able to send commands to the Arduino through the bluetooth when the servo power wires are not connected and I get a response from the Arduino. As soon as I plug the red servo wires to the VCC on the Arduino, the Bluetooth disconnects.
The batteries probably aren’t capable of powering the servo. When the servo tries to draw current, the battery voltage will drop and so will the 5v line voltage. Also, the servo will likely introduce lots of noise on the power line which will interfere with the Bluetooth module.
I recon if you use a 9v battery instead, and if you have one, add a capacitor between the +5v and GND of the bluetooth module, you should be fine, as long as the combined current draw is <120mA.
You should check the datasheet for the Servo you are using for how much current it uses, and add that to how much current the Bluetooth uses and make sure that it will be less that.