IoT heating table

Hardware open source platform https://oshwhub.com/dhx233/pcb-heng-wen-jia-re-tai

B station demonstration video https://www.bilibili.com/video/BV18L411s7fU?p=1&share_medium=android&share_plat=android&share_session_id=3f16e7db-d2fe-42b5-a620-8bd8f5c92417&share_source=QQ&share_tag=s_i×tamp=1632838258&unique_ k=MjNkAz

The production and installation video has been uploaded to Station B. I am too lazy to post the link. I will watch the next video in the submission.

QF Maker

QF HP Desktop Adjustable Curve Multifunctional IoT Heating Table

Version number V1.3

This project prohibits anyone from making profits by any means. Violators will be prosecuted.

If you have any bugs, please go to the correct channel to report them. You can leave a comment.

Since the project involves the use of mains power, we are not responsible for any electric shock accidents during debugging and use. Once you adopt this open source project, you will accept and bear the risks!

Some notes:

1) NTC needs to put an aluminum plate against the PTC and fix it with solid glue to ensure thermal conductivity, not for adhesion. If you don’t do this, the overshoot will be serious. Don’t ask everywhere (watch the installation video yourself)

2) NTC directly measures the PTC temperature. The PTC temperature limit is around 260. There will definitely be a temperature difference outside. This is determined by the performance of the PTC. It is not a bug that causes the surface temperature of the aluminum plate to be low! The higher the temperature, the greater the external temperature difference. Set a little more temperature based on experience. Or you can get a small box to cover it and keep it warm. Some test data are given below.

PTC temperature: aluminum plate surface (surface temperature of the PCB placed on the aluminum plate)

50 48

100 95

150 138

200 187

245 218

Function:

0. Free switching between constant temperature heating mode and reflow soldering mode

1. Visualize customized reflow soldering curve

2. Full progress percentage display during reflow soldering process

3. The timer constant temperature duration can be set from 0 to 520 minutes. A countdown will be displayed after the temperature reaches the preset value.

4. The Internet of Things can remotely set the temperature, mode, and switch, and can access Xiaoai’s self-training commands. The specific command corresponding functions are explained in MIOT.h

5. Reserve the DC5V fan interface to control whether to turn on the fan to facilitate user expansion.

6. Integrated power control part, no need for external switching power supply, easy to carry and save desktop space

7. The screen brightness can be adjusted to 256 levels

8. Automatically sleep for 60 seconds under low temperature without operation.

feature:

1.Single encoder operation, say goodbye to the poor experience of multi-button operation

2. Still continuing the smooth global animation of QF Maker

3. Integrated automatic download circuit, no need to understand the download mode, etc., you can simply plug in the data cable to download the program with one click, and subsequent firmware version updates can also be easily updated

4. The overall cheap solution is suitable for people with low budget who want to use reflow soldering (the specific price can be calculated by yourself with the information. I am not a computer)

5. The heating size is 68*70MM, which is suitable for most boards. If you need to modify it by yourself if you need a larger size, you can move to Huishen's open source project if you don't want to change it.

Network configuration steps:

1) Make sure that the IOT function is turned on and the attempt to connect to the network fails when turning on the computer.

2) Use ESP Touch to configure (the Dian Deng APP has built-in ESP Touch function)

Things to note when configuring IDs

1) The network has been configured successfully and is connected to a network that can access the Internet or is on the same LAN as the host

2) After the configuration is successful, the serial port will be restarted and the ID will be printed. You can check it yourself.

maintain:

2021-10-12

Adjustment:

1) More aggressive high temperature section PID

2) Adjustment of reflow parameters: the lowest value in the preheating zone is reduced to 130, and the highest value in the reflow zone is raised to 260 (but it should not be reached in such a short time, just to heat faster).

2021-10-4

New:

1) Temperature error compensation caused by LM358 offset voltage

2) Add network configuration instructions to the menu

3) IOT adds a new fan control button that flips the current on/off status when pressed.

2021-9-29

bug fixes:

1) Fixed the problem that the font of the mode selection setting is not centered

2) Fixed the problem that the screen will stop when the temperature is lower than 38 degrees in the heating state.

3) Fixed the problem that the reflow soldering percentage can only be displayed to 95

Some changes:

1) Optimize the reflow soldering progress percentage to eliminate large jumps in numbers

2) The automatic screen rest time is extended to 60s and can be changed in Tick_IRQ.h

3) Add the screen-on and screen-on interface to enter the removal animation

2021-9-28

Firmware optimization completed, data is now fully uploaded

Some changes:

1) The maximum temperature is limited to 250℃

2) Added the ability to automatically turn off the screen if there is no operation within 30 seconds after the temperature drops to reduce screen loss.

3) Add a dynamic BOM to the data package, but you still need to check the detailed description of the schematic diagram carefully!

2021-9-26

The hardware is completed, the software interface system has been completed, and the final parameter adjustment is in progress. It will be updated synchronously after completion. The current firmware is only open. Click the encoder in the main interface to turn on or off heating (temperature 270). All menus of the firmware are open for experience (except heating closed loop). The rest of the functions can be experienced normally)

Physical pictures of some components are in the attached data package. Download the data package yourself and don’t ask questions.

The 3D model anti-electric shock fence can be made of ordinary materials and does not need to be resistant to high temperatures! It is recommended that you must install it. No one can guarantee whether you will get electrocuted. If you add a fence and hold it, there will be no problem.

Open source communication group: 216066270

Copper pillar size recommendations:

M3*25+6 X4 (main control is connected to the middle heat insulation plate)

M3*10+6 X8 (connection between two layers of heat insulation panels and heating panels)

M3*6+6 X4 (connection between main control board and base board)

Countersunk head M3 screws*12

M3 nut*24 

Detailed component purchasing instructions can be viewed on the schematic diagram.