That's a big improvement.Ī opto-coupler can be used to avoid ground current and a "logic level" mosfet is not needed anymore. This one generates about a quarter of the heat.
That is 10 milli ohm at 5V and 25 degrees Celsius, and 16 milli ohm at 5V and 125 degrees Celsius. This is an other mosfet : N-channel power MOSFET : ID 355 : $2.25 : Adafruit Industries, Unique & fun DIY electronics and kits If you would use that mosfet, use a heatsink, use a few parallel or buy a better one. That is a lot for a TO-220 component without heatsink. It's Rds(on) = 35 milli ohmįor 7.5A, that would be 0.26V and 2 Watts. It can do 30A, that's okay, but not very interesting. This is a logic level mosfet : N-Channel MOSFET 60V 30A - COM-10213 - SparkFun Electronics The "logic level" means 5V ttl alike voltage compatible voltage level something. When you want to turn it on with 5V, you also need a "logic level" mosfet.
#Arduino pwm fet pdf
The heater has a 1.6 Ohm impedance.įor simplicity, I removed the Nixie tube and thermistor.įor people who don't wish to read all the post and have a similar problem, I added a PDF of my current set-up which is working.Ī mosfet is about Rds(on), the resistance when it is on.
Do I need to add a RC low pass filter at the output of my PWM pin in series with a Zener diode? Or do you see any other issue that could cause this? Is the diode mandatory?Īnyways, here is the schematics of my circuit. But before just assuming, testing and frying my arduino or the power supply, I'd like to be sure this is the only issue of my circuit. I am wondering if the power supply could "dislike" the PWM control. (Some Nixie Tube diodes turned off and i had to re-upload the program for proper display of the temperature) But as soon as I connect the heater to the Arduino, the power supply starts whistling and seems to be messing with the board as well. I use a PWM signal on pin 9 which is connected to a MOFSET N-Channel transistor. I can nicely control the output voltage to the heater. I am trying to build a heater which is controller by an arduino nano Atmega328.
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