Currently I am working on my air monitor system project. The schematic diagram of this design is attached.
Moreover, I would like to put a fan above the dust sensor to have airflow through the sensor. The fan is 5V, 0.14A. How can I power up the fan? Is it work if I connect the fan with the motor shield L298N? If yes, may I know the schematic diagram or any circuit diagram for me to know how to do it?
Thanks a lot for your help! 
What is the power source?
MarkT:
What is the power source?
Isn't that what the op is asking for advice on?
hamoking:
How can I power up the fan?
twinkleyan:
Isn't that what the op is asking for advice on?
Not really.
And Mark is I suppose asking what the power source is to the shield as it is unlikly to be the power from the Arduino.
ballscrewbob:
Not really.And Mark is I suppose asking what the power source is to the shield as it is unlikly to be the power from the Arduino.
Oh.. I didn't think about it.. Do u hv any suggestion? Is it just buying some common battery like AA battery is okay? I have no idea with it.. Sorry for asking such stupid question.. still learning
