37 lines
1.8 KiB
Markdown
37 lines
1.8 KiB
Markdown
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## [[Resources/mathematics/Proportional Integral Derivative|PID]] Controller for the Gaggia Baby Millenium
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### Parts Used
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- [ESP32]()
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- [Solid State Relais]()
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- [I2C LCD Screen]()
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- [DS18B20 Temperature Sensor]()
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- [Thick Wire](https://www.amazon.de/-/en/gp/product/B089CVRX42/ref=ewc_pr_img_2?smid=ATDBGRW2TNE4V&th=1)
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- [220v to 5v converter](https://www.amazon.de/-/en/Sharplace-Constant-voltage-downward-converter-White/dp/B07CTQQMMT/ref=sr_1_3?keywords=230v+to+5v&qid=1683574853&sprefix=230v+to+%2Caps%2C87&sr=8-3)
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# First Day
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The first day was on Friday the 27.05.2023. I went with Kilian to the house he grew up in because he had to do some measurements for his Bachelor Thesis.
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In a few hours i first checked if i could connect the relais i bought, which is this one:
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This was my first mistake, because I did not check the input voltage and only thought about how much current it could handle. The specific SSR i bought is driven by a current of 80~250 Volts AC, which the ESP32 can’t output. I had noticed this a few days earlier and went to a local electronics store and bought a classic mechanical relais. This was the second mistake I did 😀
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The thing is normally you would use this sort of relais with a small circuit (octocoupler) that isolates the relais’ control circuit from the ESP32. These circuits look like this:
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Gladly i had a grove devkit with me, so atleast i got to try out connecting one of those relais to the esp which was very easy.
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Then I also tried to connect my MAX6675 Thermocoupler to the ESP32. This was very easy to do as I found a schematic online. The MAX6675 uses [[Resources/mechanics/SPI]].
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## Second Day
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## MQTT / HomeAssistant
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