Pid Regulyator Na Arduino
Experience — or at least education — often makes a big difference to having a successful project. For example, if you didn’t think about it much, you might think it is simple to control the temperature of something that is heating. Just turn on the heater if it is cold and turn it off when you hit the right temperature, right? That is one approach — sometimes known as bang-bang — but you’ll find there a lot of issues with that approach. Best practice is to use a PID or Proportional/Integral/Derivative control. [Electronoob] has a good tutorial about how to pull this off.
Jan 27, 2015 There is an Arduino PID library (just Google Arduino PID), but no PID running on an Arduino is going to respond in 1 mSec. The very fastest you can run the PID on a 16MHz AVR-based Arduino is about every 5 mSec.
You can also see a video, below. The demo uses a 3D printer hot end, a thermocouple, a MAX6675 that reads the thermocouple, and an Arduino. There’s also an LCD display and a FET to control the heater. Request letter format for gratuity rules. The idea behind a PID controller is that you measure the difference between the current temperature and the desired temperature known as the setpoint. The proportional gain tells you how much output occurs due to that difference. So if the setpoint is way off, the proportional term will generate a lot of output to the heater.
If it is close, only a little bit of output will result. This helps prevent overshoot where the temperature goes too high and has to come back down. The integral term adds a little bit to the output based on the cumulative error over time. The derivative term reacts to changes in the temperature difference. For example, if something external causes the temperature to drop suddenly, the derivative term can goose the output to compensate.
However, the operative word is “can.” Part of setting up a PID is finding the coefficients for each term which for some systems could be zero or even negative (indicating a reverse effect). There are a lot of other subtleties, too, like what happens if the output stops affecting the temperature for a long period and the integral amount grows to unmanageable magnitude. By the way, we’ve covered a for Arduino before. While this post talks about temperature, PID control is used for everything from to.
• • • • Posted in, Tagged, Post navigation. Ehmmm temperature control by modulating the heater element in the correct way is one thing but measuring the temperature is another. When a thermistor tells you that you project is exactly 100C you are not done. Because this doesn’t mean that the whole block is heated up to 100C, the block ins’t perfectly insulated, there are losses and in case of an extruder, the plastic it is being fed will cool down the block locally. Also the thermistor needs to make propper contact with the block, a glass beat thermistor isn’t perfect.
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