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I have made the code I have put together on an Arduino Mega available on Github. Uses a 320*480 TFT LCD display. https://github.com/Brewzone/TFTBREW Allows simulation in code to speed up the process of finding the correct Kp Ki and Kd values ahead of brewday.

The graphs below show how the Arduino PID libraries react to the following Kp Ki and Kd values: 1st run uses Kp=20 Ki=5 Kd=1 and a SP and PV of 63 degrees C. 2nd run uses Kp=1240.0 Ki=2524.5 Kd=1198.5 and a SP and PV of 63 degrees C. Temperature curve is in the top half of the graph and...

Spent a few days setting the Arduino Mega to do PWM at 50Hz with a duty cycle between 0-1023 on Pin44 rather than the stock settings that the core libraries seem to impose of 490hz with a duty cycle between 0-255. To introduce some protection against the SSR failing in the on state I'm looking...

There are a few ongoing threads discussing PID values and Sous Vide https://www.thehomebrewforum.co.uk/threads/what-else-do-you-use-your-brew-equipment-for.69225/ https://www.thehomebrewforum.co.uk/threads/pid.73592/#post-707467...

Sous Vide obviously is !

Ok, I was invited to this forum way back when by Wez, Remember Wez? He set up this forum because at the time there were a lot of aggressive posts over on another Brewing forum. Seems nothing really changes !

I'm interested to see what values those that dabbled with Their PID systems were getting from a few years back. Ive seen some really great Quadcopter builds using the Arduino PID libraries. Not having the time to get into making My own Quadcopter I thought doing some tests with Sous Vide would...

Today We are mostly making Sous Vide Eggs and Steak

Forgive Me but Your Signature is: "Patience is the Friend of the Homebrewer" Little evidence of that if You ask Me LOL :-)

Having read that changing the Setpoint can have undesired effects on the process I tested a few increases to see what happened. Not a lot other than ramping up to the new Setpoint so all seems well.

I was a little surprised by the fact the Autotune finished in only 12 minutes. As I am running simulations of 18L with a single 2.4kwh element in a 33L stockpot I checked the code and found a small oversight regarding the fact that the Autotune Library cycles the Output between +198% to -193%...

The Autotune took around 12 minutes. The 1st section using the step tuned values took around 90 seconds to heat from 60C to 63C and 270 seconds to reach steady state. As You can see it takes quite a while longer in fact 1215 seconds for the Autotune derived values to reach a steady state value...

Below is a graph showing the values of Kp Ki and Kd which were found using step tuning methods After a few minutes and once the Output and Temperature have reached steady state I started Autotune As You can see the Output oscillates from +198 to -193 for a few cycles and then sets Kp=251.82...

I've had Lagers that smelled of rotten eggs. Clean a ladel with boiling water to sterilise it and scoop some out into a glass. Have a taste, if it seems fine chances it is.

Below are graphs showing the effect of Kp Ki and Kd on an Arduino Mega Output running the PID Libraries using PWM. I expect there will be no noticeable change using Time Proportional. Figure 0 shows Kp=255 Ki=0 and Kd=0 Figure 8 shows what I found to be the perfect settings for 18L in a 33L...

If You put the relay in a watertight container with cable glands its pretty safe so long as You intend to be around throughout to ensure if the relay fails there is a human override. I have run the PWM system again with Kp Ki and Kd adjusted to reflect the Output limit of 255 rather than 10000...

I have been working on a PID system based on the Arduino PID libraries. Reading all I could on the subject of PWM vs Time Proportional Heating Control I decided to do some comparison runs. I created a simulation routine to save Me having to run the tests in a real world environment. This...

Dave Lines book brewing beers like those You buy. Set Me off on a life long love of brewing all grain. Wish He was around to write more on the subject.

Hi Mate! Glad to see one of My systems still being used a couple of years later. Look forward to seeing pics of the 1st brewday in the new brewhouse. BZ

Linux Mint 15 Cinnamon for Me, Just need to get a Linux compatible wifi card instead of using ndiswrapper.