Electronics > Beginners
Can a variable thermal shut off circuit be build?
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FriedMule:
I have tried to make something that may work, remember I am as noob as they come! :-)
My idea is that the "temp to LCD" shall connectes in some way so the display show max alloveable temperature and by switch, show the current temperature.
Placeholder relay shal go to an NC 100A 100V relay
ledtester:
Why is pin 3 of the LM358 unconnected?

Temperature doesn't change that fast, so why not just use the uC to activate the relay? In pseudo-code:


--- Code: ---    while (1) {
         read LM35 using the ADC
         if LM35 temp > threshold temp:
            activate relay using a GPIO pin
            break
    }

--- End code ---
FriedMule:

--- Quote from: ledtester on August 05, 2019, 06:32:29 am ---Why is pin 3 of the LM358 unconnected?

Temperature doesn't change that fast, so why not just use the uC to activate the relay? In pseudo-code:


--- Code: ---    while (1) {
         read LM35 using the ADC
         if LM35 temp > threshold temp:
            activate relay using a GPIO pin
            break
    }

--- End code ---

--- End quote ---
Oh sorry, an error! LM358 Pin 3 -> LM35 pin 2

I am not sure about your code question, uC ?
coppercone2:
use a contactor triggered by a thermostat (heat sink the parts so you can screw a thermostat into them, it will be more fool proof then trying to make a control system based on thermocouples that is safe, thermostats and contactors are used everywhere
ledtester:

--- Quote from: FriedMule on August 05, 2019, 06:41:55 am ---
I am not sure about your code question, uC ?

--- End quote ---

uC = microcontroller
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