[SOLVED] control algorithms on heater

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mohamed.elsabagh

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I would like to design a heater controlled by microcontroller, and I don't want to use PID control algorithm because the initial temperature of this heater is not constant or unknown (calculated during run time).
 

how are you going to set the temperature at run time, e.g. keypad, potentiometer, etc? In any case PID is probably overkill, proportional is usually sufficent unless one has a very sophisticated system. e.g. as the temperature gets closer to the set point you reduce the power going into the heater (PWM is a useful technique for this)
 

mohamed.elsabagh,

To control manage heating devices, is most used histeresis loopback, that works like thermostat.

+++
 

I am not going to set the temperature at the run time, I will give you an example if 2 heaters are going to heat a body the first heater is going to heat up the body to temperature x given by the user, the next step the second heater will heat the body from temperature x up to temperature y, each heater should be controlled by a separate algorithm for example PID.
 

I am not sure what you problem is. In your first post you stated "I don't want to use PID control algorithm ...". If so you can use simple ON/OFF (with hysteresis as indicated by andre_teprom). In you last post you said you would have two heaters both controlled by PID. Which are you interested in ON/OFF or PID control ? In practice I have found proportional control (using PWM) is satisfactory for water heating systems, etc.
 

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