2 layers132.5 × 66.5 mm Qtkiln, the printed circuit board in 3D

Qtkiln

Open source controller for kilns of all sizes with home assisstant integration

Size: 132.5 × 66.5 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 26
Nets: 45
Pads: 97
Tracks, vias: 128, 0
Pours: 5
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 16 Mar 2025
Updated: 4 May 2025

Overview

Qtkiln is an open-source printed circuit board by beckdac, from the beckdac/qtkiln repository on GitHub, published under the MIT licence. It is a 2-layer board of 132.5 × 66.5 mm with 26 parts on 45 nets, routed with 128 tracks and 0 vias.

It is built around the ESP32-WROOM-32U. Its parts include 10 resistors, 9 connectors and 3 transistors. It belongs with the ESP32 boards of this library.

Main components

ESP32-WROOM-32U
SMD,19.2x18mm-40℃~+85℃ -97dBm 2.4GHz 20.5dBm 3V~3.6V Bluetooth4.2 ESP32-DOWD UART、SDIO、SPI、I2C、GPIO、PWM、ADC、DAC、CAN SMD,19.2x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules

README

README.md

qtkiln

Open source controller for kilns with home assisstant integration

Home Assistant Integration Screenshot

Reference PCB Image

wifi_cred.h should look something like:

text

#define WIFI_SSID "ssid"
#define WIFI_PASS "password"

mqtt_cred.h should look something like:

text

#define MQTT_BROKER "192.168.1.42"
#define MQTT_USER "qtkiln"
#define MQTT_PASS "password"
#define MQTT_PORT 1883

Using mosquitto pub and sub clients on linux, you can modify the settings and listen to the devices, e.g.:

text

# listen to all traffic from kilns
mosquitto_sub -v -u mqtt_user -P mqtt_password -h mqtt_host -p 1883 -t 'qtkiln/#'
# change the config for a kiln and reset it
# for example, change the mqtt update frequency to once per 3 seconds
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/config -m '{"mqttUpdateInterval_ms":3000}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/config -m '{"reset":true}'
# change the set point for the temperature control
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/set -m '{"targetTemp_C":42}'
# turn on the pid control
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/set -m '{"pidEnabled":1}'
//mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/get -m '{"targetTemp_C"}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/get -m 'statistics'

Debug / test protocol

text

mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/config -m '{"reset":true}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/config -m '{"mqttUpdateInterval_ms":3000}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/config -m '{"save":true}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/set -m '{"targetTemp_C":42}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/set -m '{"targetTemp_C":42,"pidEnabled":true}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/get -m '{"statistics":true}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/set -m '{"debugPriority":100}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/set -m '{"alarmOnSSR":true}'
mosquitto_pub -L mqtt://mqtt_user:mqtt_password@mqtt_host/qtkiln/ECDA3BC01AB4/set -m '{"pidEnabled":false}'

Current dependency set:

text

  WiFi at version 3.1.3
  Networking at version 3.1.3
  Preferences at version 3.1.3
  MAX31855_RT at version 0.6.1
  SPI at version 3.1.3
  EspMQTTClientFork at version 1.13.4
  ArduinoOTA at version 3.1.3
  Update at version 3.1.3
  PubSubClient at version 2.8
  WebServer at version 3.1.3
  FS at version 3.1.3
  ESPmDNS at version 3.1.3
  TM1637 at version 1.2.0
  ArduinoJson at version 7.3.1
  QuickPID at version 3.1.9
  sTune at version 2.4.0

Parts

Qty	Value	Footprint	References
4	10K	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Vertical	R3, R4, R7, R10
3	1K	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Vertical	R1, R5, R8
3	2N3904	Package_TO_SOT_THT:TO-92_Inline_Wide	Q1, Q2, Q3
3	510	Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Vertical	R2, R6, R9
1	ESP32_WROOM32	PCM_Espressif:ESP32-DevKitC	J2
1	LCD_TM1637	Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical	J7
1	MAIN_PWR	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J1
1	MAX31855_HSING	Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical	J9
1	MAX31855_KILN	Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical	J8
1	PZO_SPKR	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J6
1	RESET_SWTCH	Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical	J3
1	SSR40_DA1	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J4
1	SSR40_DA2	Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical	J5

The 22 most common of 26 parts.

Questions

How big is the Qtkiln PCB?

It measures 132.5 × 66.5 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Qtkiln use?

26 parts, built around the ESP32-WROOM-32U. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Qtkiln KiCad files?

From the beckdac/qtkiln repository on GitHub, at the commit this page was made from: the board is pcb/qtkiln/qtkiln.kicad_pcb and its schematic pcb/qtkiln/qtkiln.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Qtkiln design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

ESP32

Topics

esp32 kiln pid temperature-control ssr40da

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/beckdac-qtkiln" title="Qtkiln in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/beckdac-qtkiln.jpg" alt="Qtkiln" width="1200" height="900">

A picture that opens the board, for a README

[![Qtkiln](https://pcbkit.io/embed/boards/beckdac-qtkiln.jpg?size=s)](https://pcbkit.io/boards/beckdac-qtkiln)

Source

Repository: beckdac/qtkiln
Board file: pcb/qtkiln/qtkiln.kicad_pcb
Commit: b2f21c5
Licence: MIT

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