I got a starter kit from OddWires. It comes with a basic Servo which I have already tested/operated using my arduino uno connected to the USB port. I connected the motor to the 5v.
I ran into a couple of doubts:
- I wish to connect and control an LED via a bluetooth module which also came in the kit (HC-05 RS232) and for that I need to disconnect the USB cable from the Arduino and have it run off the included battery pack which is for a 9V battery.
A - What does this mean in terms of the voltage coming in, since the board usually gets up to 5V from the USB cable but now its getting up to 9V from the battery pack?
B - This wont ruin my board?
C - How come?
D - How about the LED? I understand LEDs must be protected by resistors which normally is a 220ohm resistor. From what little I know about electronics, this means that whatever voltage (or current) is coming into the LED, this resistor will provide 220ohms of resistance, which will "sort of" reduce the voltage down from 5V to some other value, say 3 or 4V. But if Im putting in 9V now, will a 220 ohm resistor fail to protect my LED?
- I also have a servo motor which I want to control via bluetooth (once I get my BT issues sorted out). Im not sure yet what voltage is my servo, but I understand there are different types. Could my servo burn out from switching it from my 5V USB power source to a 9V battery pack? Or worst, what about my BT module?
Please enlighten me