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July 11, 2011
about 4 years ago
The fan draws 1000mA: http://www.alibaba.com/product-gs/400684756/USB_Computer_Desk_Cooling_Cooler_Fan.html
Do I still need an independent power source?
If so, how does the 5V regulator fit into the circuit diagram above? Is the Mosfet still necessary?
Thanks for all the help!
Thanks for the additional tips. Just want to also check if I need an external 5V power source for the fan or can it be powered entirely from the arduino uno board? Can I just connect the positive lead of the fan to the positive of the breadboard and then connect that to the arduino 5V?
Thanks for the advice! I’m totally new to electronics so I’ve got some more questions. The info I found online for calculating the pull down and current limiting resistor pertains to LEDs only. How would one calculate the values for both for my case?
Also I assume the circuit diagram to be:
Mosfet Gate Pin -> pull down resistor -> current limiting resistor -> Arduino IO
Positive lead of Fan -> Mosfet Source Pin
Mosfet Drain Pin and Fan Negative lead to ground
Have I got this right?
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