Your main problem is likely the temp sensor, not the heater. It can't possibly get to 384.
There should be a little conversion board on the head of the printer. It should have 3 wires going back to the printer. One is ground, one is 5V and the other is temperature. It should be outputting 0V for 0C and 5V for 500C and so on. So if at room temp it should output around 200mv. Check that signal - if it's good but arduino reads 384 then indeed arduino is probably bad. Much more likely there is a loose wire somewehre in there.
Also be aware that the fan can cause interference especially if not at 0% or 100%. Keep the fan wires at least 2 cm away from thermocouple wires. There are minor edits to that board (ad597? something like that) that drastically reduce the sensitivity to interference from the fan but first make sure your problem is the fan (probably not - probably loose wire somewhere).
Thank you for the fast reply
The temp sensor has never been used before, I don't see why it would be bad? I'll have to buy a multimeter to check voltages and whatnot, I can try that on Monday
I don't think I have a loose connection, I get Mintemp when things are not connected on power up. Maxtemp rears its head after a few seconds when things are connected.
I currently do not have the fan connected because I heard it can cause interference. Will that cause maxtemp?
On Monday I'm thinking of going to Lancashire so 3DGBIRE can take a look at it, I don't know what else to do.
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gr5 2,224
Your main problem is likely the temp sensor, not the heater. It can't possibly get to 384.
There should be a little conversion board on the head of the printer. It should have 3 wires going back to the printer. One is ground, one is 5V and the other is temperature. It should be outputting 0V for 0C and 5V for 500C and so on. So if at room temp it should output around 200mv. Check that signal - if it's good but arduino reads 384 then indeed arduino is probably bad. Much more likely there is a loose wire somewehre in there.
Also be aware that the fan can cause interference especially if not at 0% or 100%. Keep the fan wires at least 2 cm away from thermocouple wires. There are minor edits to that board (ad597? something like that) that drastically reduce the sensitivity to interference from the fan but first make sure your problem is the fan (probably not - probably loose wire somewhere).
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