ESP32

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What is your current ESP32 side-project? (lemmy.ml)

submitted 6 days ago by [email protected] to c/[email protected]

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It's a bit sad how deserted this community is, would love to connect more with other makers.

Let's rattle the cage a bit, who of you is here, and what are you working on?

I'll start: A wireless cryptographic keystore & signer. Keys are generated with the hardware RNG and stored AES-encrypted with the user's password, and you can request signatures via BLE.

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[–] [email protected] 2 points 4 days ago* (last edited 4 days ago) (2 children)

I have built incubators for several different projects (seedlings, mushrooms, tempeh, fermentation, etc...). Learning how to control a heat distribution in a safe and efficient manner has been a bit of a journey for me. Just recently I begun experimenting with positive temperature coefficient (PTC) heaters and I am very happy with them as I feel much safer running these than ceramic/IR heat lamps and regular heating elements.

At the moment I am heating an incubator for petri dishes using a 12V/100W PTC heater with a fan hooked up to an stc-3008 thermostat. The PTC undergoes on/off cycles that keep the temperature near 26 C, but, even when setting the upper and lower control limits quite tight, the temperature still oscillates up to +/- 2 C during these cycles.

I have been studying how to implement a proportional–integral–derivative (PID) controller to avoid the on/off cycles. My next experiment is to try to control the power of the PTC with a Mean Well HLG-120H-12AB LED-driver in constant-voltage mode and the ESP32 as the PID controller.

[–] [email protected] 2 points 4 days ago (1 children)

that's so interesting, are you doing this at work or are you an avid gardener?

[–] [email protected] 2 points 4 days ago

It's for hobby!

But I did work with cell cultures (with lab-grade incubators) in the past, and I am currently working with a company developing sensors for industrial systems. So, the concept of PID I learned at work recently. And at work I also write some firmware for interfacing sensors with micro-controllers.