Sous Viduino

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Magelan
 
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Joined: Mon Sep 01, 2014 6:46 pm

Sous Viduino

Post by Magelan »

Hello,

I am going to use the sous viduino tutorial as the base to build a incubator, but I need to use 2 temperature sensors, a more precise control of temperature, and my main problem is how can I make a true PWM control (using PID) to use a SSR relay.

How can I change the code to accomplish a true PWM control?

I am using the arduino nano, RGB LCD shield, 2 heaters, one for 12V and other for 220V, the system will work with 12V and 220V power supply.

Thanks,

Magelan

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adafruit_support_bill
 
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Re: Sous Viduino

Post by adafruit_support_bill »

The only difference between TPO and PWM is the frequency. There is no "official" frequency delimiter that I know of. But if you set windowsize short enough, you can call it PWM.

One thing to be aware of is that the higher the switching frequency, the more heat you will need to dissipate from your SSR. Most temperature control systems have a fairly slow response. It doesn't make sense to use a switching frequency much higher than the thermal response of the system.

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