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Problem iron station V3 - Tip Error - Electronoobs Q&A

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Hello my friend, at first i want to thank you for your work, i learn much from your videos , posts and etc. i have made soldering iron v3 , everything is fine , at firs i had lroblem with programming, when i atacched 5 main fomponents and tryed programming with FTDi , it was everything fine , but when i finished assambling , when i connected module it was turning off from conputer, but i guessed it was problem with buck comverter, i had to program it until i connected buck converter , i did so and everything worked fine, i programmed it , turnd it on , numbers on screen began encrasing but after a moment it sayes TIP ERRoR, Tip is getting hot but not very, and after Tip error it stops heating. What maybe wrong with me ? Please help. Thank you in advance. 

P.s. i mensioned now that tip is starting heating even untill i push start button, maybe this will help you to hnderstand problem. 

asked in Circuit basics by (130 points)

1 Answer

0 votes
Ok. First of all, are you uisng this code version for the PMOSFET: https://www.electronoobs.com/eng_arduino_tut49_code1.php

Then, is the tip properly touching the metal clips? Usually when the tip is not connected the temperature will increase up to 700ÂșC and you get tip error.

How do you power the tip? Don't connect the T12 tip with 5V from the FTDI, always connect main input when the T12 tip is connected since it requies much more power.

Also, the OPAMP is amplifiing ok? You should run another code and print the analog read from the OPAMP to serial monitor and see if you have a good signal of the temperature.

Also, could that be a different type of T12 tip? IDK, maybe the internal resistance+thermocouple be different...

I really hope this will help you. Any other question, just post, I'll try to answer fast...
answered by (33.4k points)

Thank you for response,
1.yes im using code 3.3Pmos
2. Yes tip is connected good, ihabe checked woth multimeter connection.
3. I dont know how can i check opamp , what code to use to check it from serial monitor i dknt know.
4.i think its usual t12 tip. Here are pictures of it too.

Vwhen i connect usb , it starts getting hot imediatly, without pushing start button, i think problem is coming from this.
PLease give me edvice, direction or something :(( help me :( im trying to make it for weeks
You would need an oscilloscope. If you don't start it and already getting hot, that means that the MOSFET ia activated. As you can see, at the MOSFET gate there is a small BJT transistor that will activate the gate. Check if the gate is activated without starting the iron. To check the OPAMP output just run a simple code that will print on the serial monitor the analogRead() on the OPAM input which I think was A0 right? Heat manually the iron tip and see the analog read.
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