Kotlet & PWMaster
Kotlet Kotlet
PWMaster PWMaster
PWMaster PWMaster
So how about we brainstorm a precision cooling system for a sous‑vide bath? That’ll let you keep the water at the perfect temperature while I can fine‑tune the airflow to keep the room cool and the kettle humming.
Kotlet Kotlet
That sounds like a deliciously cool idea! First off, let’s talk temperature control—maybe a PID loop with a high‑accuracy RTD or thermistor inside the bath, paired with a smart thermostat that can ping your phone when the temp dips or climbs. Then for the cooling side, a water‑cooled heat exchanger with a tiny, low‑profile pump can suck heat from the bath and dump it into a chilled coil that’s tucked right under the stove. Add a small fan and a little dehumidifier for that room‑cooling vibe—keep the steam from turning the kitchen into a sauna. We can even throw in a splash of a smart water‑level sensor so the bath never spills its secrets. What do you think, ready to turn this into a culinary laboratory?
PWMaster PWMaster
Sounds solid. I’d use a PT100 RTD for the bath – 100Ω at 0 °C, 110Ω at 100 °C, gives a nice 10 % range. Couple it with a 4‑wire feed to avoid lead resistance, and a 2 ms response time. The PID can live on a ESP32; it’s got a decent ADC and plenty of Wi‑Fi. For the heat exchanger, a copper coil with 25 mm OD, 5 mm wall, run about 3 m of tubing to get decent surface area. A 1 L/min pump should give you ~5 °C per minute removal if the inlet is at 60 °C and the outlet at 35 °C. Put a 120 mm fan at the coil exit, set to 3000 rpm, that’s ~2 kW airflow – enough to keep the room down to 22 °C if you’re in a small kitchen. And a 40 L/min dehumidifier will keep that steam out. I’d wire the water‑level sensor to a 0.5 mA current source; it’s cheap and gives you 0.1 % resolution. All right, ready to pull the schematic?
Kotlet Kotlet
Whoa, that’s a whole kitchen lab! PT100, 4‑wire, 2 ms – you’re practically a wizard. ESP32 PID, copper coil, 1 L/min pump, 5 °C a minute, and a 120 mm fan blasting 2 kW of air – you’re practically keeping the weather in check. Dehumidifier 40 L/min? That’s basically a weather‑station upgrade. And a 0.5 mA current source for the level sensor? Pure genius. Grab your multimeter, let’s wire this beast and make the kitchen the coolest place on Earth. You ready?
PWMaster PWMaster
Alright, grab the multimeter, I’ll set the PT100 wiring first. After that we’ll hook the ESP32 and start the PID loop, then run the coil and pump. Kitchen lab, here we come.
Kotlet Kotlet
That’s the spirit! Let’s hit the PT100 first, keep those leads tidy, and make sure the 4‑wire is solid. Once the readings are sweet, we’ll power up the ESP32 and get that PID humming. Then the coil, the pump, the fan—watch the temperature dance. Kitchen lab, here we come, and we’ll make that sous‑vide sing!
PWMaster PWMaster
Got it, let’s start with the PT100. I’ll put the four wires in a star pattern to keep the lead resistance at a minimum, then pull the ADC on the ESP32 to a 2 ms sample time. Once the baseline is set, we’ll kick the PID in overdrive and watch the bath hit the setpoint in a few seconds. After that, the coil and pump will just do their job – we’ll keep the temps humming while the kitchen stays cool. Let’s wire it up.