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Download
Harmless
Posts: 22
Registered: 29-1-2018
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I haven't bothered to read everyone else's posts but I'm going to suggest forgetting making a "proper" interface.
Instead, get yourself a solid state relay, hook it up inside the hotplate so it can disconnect the hotplate when power is applied, and then have an
external connection which goes to a digital thermostat. On ebay and Aliexpress and those sorts of places you can pick up a thermostat that takes
K-type thermocouples for less than US$5 with shipping. The thermostat can turn the hotplate on and off for you.
Doing it the proper way might look neater, but you'll spend loads of time and money figuring it out.
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monolithic
Hazard to Others
Posts: 435
Registered: 5-3-2018
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Quote: Originally posted by Download  | I haven't bothered to read everyone else's posts but I'm going to suggest forgetting making a "proper" interface.
Instead, get yourself a solid state relay, hook it up inside the hotplate so it can disconnect the hotplate when power is applied, and then have an
external connection which goes to a digital thermostat. On ebay and Aliexpress and those sorts of places you can pick up a thermostat that takes
K-type thermocouples for less than US$5 with shipping. The thermostat can turn the hotplate on and off for you.
Doing it the proper way might look neater, but you'll spend loads of time and money figuring it out. |
If you do this you will have to break the circuit for the heating element, otherwise you'll lose stirring as it switches the PID controlled relay on
and off.
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Twospoons
International Hazard
Posts: 1282
Registered: 26-7-2004
Location: Middle Earth
Member Is Offline
Mood: A trace of hope...
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| Quote: Originally posted by p4rtridg3 | | After testing some LM35s I got online, I can confirm that it is in fact the cold junction compensator for the probe. Now all I need to do is wire it
up. |
Its kind of surprising just how much reverse engineering can be done from a photo of a PCB.
Always makes me laugh inside when I visit a tech company and have to leave my phone at reception. When a glance inside their product will tell me
most of what I need to know...
Helicopter: "helico" -> spiral, "pter" -> with wings
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