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I am PWMing the pin 3 of the nano. What I noticed is that when i disconnect the 19V supply, the serial monitor shows a steady 0 from the pot read from A0. Triple check the wiring and post a circuit diagram hand drawn, not Fritzing.
But that didnt make a difference. A thermistor is a type of variable resistor used to measure temperature. The thermistor 25W 5. MarkT Brattain Member Posts: Is the attached looking any better?
IRFZ34N IRF HEXFET ® Power MOSFET ChipFind Datasheet Archive |
The key specification is the value of Vgs quoted in the on-resistance section. Is your printer bed rotating? Attached is the new circuit just a variation to my prev, this time using a pot.
I need to study more. Agree about the gate resistor. I did connect a 10K from the gate to the ground. The gate resitor is way too high. This is one of many useful ones. Normally the on-voltage will datssheet about 3 times the threshold voltage being the point the device switches fully off.
Ok, once again, thanks for helping out an electrically challenged person. As mentioned above, the schematic shows the MOSFET wired backwards, which can’t work the heater should be on all the time due to the body diode.
So the heater can be on during reset until the pin 3 pinMode is executed in setup.
datasheett A better choice would be more like ohms, high enough to limit current but low enough to charge the input capacitance quickly as possible. But when I connect the 19V, the values start floating wildly, and thats probably why the thermistor started smoking before I unplugged.
PDF IRFZ34N Datasheet ( Hoja de datos )
The test code I used is here. Screen Shot at Also the sine wave code is something I found out on one of the forums that was used to demo a bulb going dim and bright slowly. Some people get confused by the threshold datashset – this is the voltage the device switches fully off, not on.
But the thermistor isnt turning off. I tried at reducing the resistor from 10K to Ohm. It sends sine wave: The behavior that you describe sounds like what jremington mentioned in reply 7.
Dstasheet measured a 2. In between those two the device can be half-on, meaning it may dissipate lots of power and get very hot – the region of operation you want to avoid. Here is the code, Code: If that is a problem, datqsheet 10K. Please point out what you are calling a thermistor on your diagram.
Datasehet getting too hot. I read serial values and can see that the pot is working. I am using the attached circuit to heat up the 3D printer bed. If you mean that the power resistor heater is not turning off, double check your wiring and the pinout of your MOSFET.