#6 12 VOLT FAN MANUAL#
The N Channel MOSFET would be configured as a low side and not high side switch. 6 Inch 90w Electric Cooling Fan 12 Volt Toggle Manual Switch Wiring Kit. The drawing is incorrect as pointed out below and thank you to jremington for pointing it out. Run the wiper out into the A0 (or any analog in) and map the analog in to your PWM out.
If you have a 10K pot laying around tie one end to 5 Volts and one end to Ground. If not then add a transistor as was suggested. Likewise I would try applying 5 volt PWM and see if it works. If it is just open collector you can try adding a pullup to 5 volts to get 5 volt pulses. The output is normally a 12 volt pulse if the fan is configured like the above illustration. If you choose to use the tachometer output to measure fan speed keep in mind the output is normally 2 pulses per revolution.
#6 12 VOLT FAN PLUS#
At 6.025 volts current was 75 mA and speed was 1460 RPM and finally at 3.011 current was 31.3 mA and RPM was 114 to 125 fluctuating plus the fan needed greater than about 3 volts before it would rotate. At 9.013 VDC the current draw was 115.2 mA and speed was 2,139 RPM. My experience with an 80mm x 80mm 12 volt fan was at 12 VDC it drew 157.4 mA and ran at 2740 RPM. I would not use 5 volts to power the fan since once we get down to 3 volts the average 12 volt fan quits turning. XOOL 12V 6 Car Fan, Clip Fan 360 Degree Rotatable Car Fan Cooling Air Fan with Stepless Speed Regulation & Cigarette Lighter Plug for SUV, RV, Vehicles. If you just want to experiment I would find a 12 VDC out wall wart for a power supply. So you just apply a PWM signal input to the PWM pin on the fan. It should be possible to fix that in the code. The fan may emit an audible whining sound because the Arduino's pwm signal is in the human audible range. Again, you will need to strictly limit the current drawn by other components connected to the Uno, or it could be damaged, or will refuse to work for more than a few seconds at a time because it's regulator is overheating.īest option of all, and possible inside a pc, would be to supply 12V to the fan and 5V to the Uno (to its 5V pin). You could use a 12V supply and wire that direct to the fan and also to the barrel socket or Vin pin of the Uno. Otherwise, the current surge as the fan starts could damage the Uno.
#6 12 VOLT FAN CODE#
Also you will need to write code to "soft start" the fan. So I assume this is the problem with all the fans that people are not happy with and why some people are very happy as they have two batteries. Also you will need to limit any other components you connect to the Uno, as the fan will use most of the current the Uno can provide at 5V. My supposedly 12 volt fan only has one 6 volt battery in it but the accommodation for two. Obviously, with only 5V power, the fan will run at much slower speed than with 12V. You can even power the fan from the 5V pin. You can also monitor the speed of the fan using another Arduino pin (that one does not need to be a pwm pin). Yes, you can control the speed of the fan by connecting the pwm pin on the fan to, guess what, a pwm fan on the Uno.
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