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ESP32 heating stage

Overview

ESP32 heating stage

Project reference from peng-zhihui/OpenHeat (github.com)

heating plate

The heating plate uses trace resistors on the aluminum substrate to generate heat, and the traces are designed as Hilbert curves.

PCB trace resistance calculation:

Resistivity of copper: ρ=0.0175Ωmm ² /m

Trace length: L

Trace width: W

PCB copper thickness: D=0.035mm

PCB trace resistance: R=(ρL)/(1000×WD)

Hilbert curve length calculation:

Order: n

Unit length: d

Total length: l =(2 ²ⁿ -1)×d

The total length of the sixth-order Hilbert curve with a unit length of 1.23mm is 5036.85mm, the trace width is 0.84mm, and the calculated theoretical resistance is about 3Ω. The power supply is 24V/10A, with a maximum power of 192W.

Thermometry

K type thermocouple+MAX6675

Do not use the Teflon insulation layer below for thermocouples. When the temperature approaches 300°C, the insulation layer will melt and cause a short circuit. The insulation layer that can be used is fiberglass.

structure

Screws and copper pillars:

1. M3*5 padded screws×30

2. M2*5 round head screws×4

3. M3*8 double-pass copper pillar×18

4. M3*8+6 single-head copper pillar×4

5. M2*10 double-pass copper pillar×2

6. M3 insulation gasket×2

7. M3 gasket×4

Instructions for use

The file system will be formatted when it is started for the first time, which will take some time.
Click in the main interface to enter reflow mode
Double-click on the main interface to enter power mode
Long press on the main interface to open the menu
Long press in the main menu to return to the previous level
Adjustable PID parameters and Kalman filter parameters

Design Files

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It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-08-05 07:52:08

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