Hi, I'm doing a project where I'm going to do some heat with a 12V 40W 620 cartridge heater and I want to power the cartridge on so the temperature goes up and I want it to turn off when it's at the right temperature so I don't know if I need a relay or something and I'm going to use a 24V source. So I need help to know how to connect for example my relay with a module and I need an explanation of a program for that... Thanks in advance!!
First You write about 12 volt, then 24. No big difference. Managing the current would be the first thing.
Relay modules is one choice, SSR, Solid State Relay another.
Measuring the temperature in the right place, air circulation are other parameters to mook for.
Program.... Turn on the heating when belo target, turn off when above target. Eventually turn off before target, turn on above target... What precision do You need, and why?
I’m heating a 3D printer head and I need it to stay at the right temperature but I don’t know how to plug a relay and how to program it. I never did that… so a little bit precise is useful. And I already have a program that read the temperature.
Hello mat5525
Take a view here to gain the knowledge.
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Relays have a limited life. Using f ex. a logic level N channel MOSFET transistor and 2 resistors are often used. Schematics are easy when the Pc is availabe....
PID regulation is likely also needed. Lots of tutorials availble. Many helpers knows links to that.
Looking close at the head and how measure temperature is needed. What stuff have You got? Links to datasheet please.
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Well OK then. Your heater load will be about 40 Watts / 12 Volts = 3.333 Amps do allow a little overhead and figure maybe 5 ~ 6 Amps. You would do much better using a 12 volt source. Anyway your current draw really isn't much so personally I would go with a logic level MOSFET like the FQP30N06L for switching your heater element On / Off.
Next you need a temperature sensor and this is likely best chosen by looking at exactly what you are heating and choosing the best location for your temperature sensor. For a sensor you consider things like type and response time. In some cases a simple On / Off control with a little hysteresis works fine while in some cases a PID type control is the better choice. All depends again on exactly what you are heating, like the mass. You may also want to just run with an off the shelf temperature controller solution. Temperature range is also what figures into the decision making process. What temperature do you wish to control at? That helps also in choosing the sensor.
Anyway, as mentioned for what you have mentioned I would just run with a simple MOSFET verse a relay or DC SSR but your call on that. What Arduino are you considering?
You can buy a 12 volt 10 amp SMPS for under $20.00 USD and I would consider that. Your heater is a purely resistive load. Using a relay you will need a flyback diode across the coil and be introducing inductive kick in the power supply line.
Ron
If you apply 24V to a 12V 40 Watt heater, the current will be 6.7 Amps and wattage will be 160.
It is similar to this:
Or
You can see more detailed at Arduino controls heating element or Arduino heating system.
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