Firmware for Parametric Profiles

[borland1]

Parametric Profiles. Here's a different approach to modifying Reflow Profiles, by changing parameters in a systematic way. Here's highlight of this firmware.

• Easy way to fine tune profiles for variations due to ambient temperatures, SMD components sizes, PCB size changes, varying solder paste characteristics, or other considerations.

Parametric Profile Features

• Seven fully editable reflow profiles
• 13 user editable profile parameters, plus title length up to 19 characters
• All changes are saved to EEPROM.
• Default profiles can be restored, if needed.

Other improvements

When running a reflow profile...

• History is maintained on display until user manually exits back to main menu or restarts another reflow run
• Reflow Phases are shown on display as a status message (preheat, soak, reflow, cooldown)
• Countdown timers for individual phases and for total reflow runtime.
• Improved PID Tuning, with linear interpolation between all data points over entire profile
• Some bug fixes included

Some screenshots

Edits enabled for all selectable Reflow Profiles

Profile Edit Options

Edit Parameters Scrolling Menu with scrollbar

Rename Profile Menu

Restore Defaults

Example Reflow Run

Reflow Run Completed, Cycling Message on Status line

Example RAMP SPEED TEST

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Download Firmware Release Version: PP.12.20.25 HEX File:

firmwarePP12_20_2025.zip

Firmware Installation Considerations

• No affect on Setup values saved to EEPROM. All oven setup settings are retained.
• This firmware does overwrite any Custom 1 and Custom 2 temperature values previously stored in EEPROM.
• Recommend, immediately after flashing firmware, turning off power switch, disconnect ISP ground wire and FTDI serial programmer, then do a power-on boot.

Profile Support Info:

• Solder Paste Datasheets with manufacturer's guidance on adjusting reflow profiles...

Amtech Syntech_LF_42Sn58Bi.pdf

Amtech_4300 63Sn37Pb.pdf

Amtech_NC_31_42Sn57Bi.pdf

Final thoughts...

PID re-tuning was done for later model unmodified T-962 oven with exhaust vent duct. Tuning should be good for other models too. This firmware seems pretty bullet proof to me, but there might be something I missed or didn't fully test. Post comments if you have any problems. Enjoy.

[Maurizio66blu]

Hi! Please, I'd like to know what compiler (and the version) you used. Thanks.

[borland1]

I used Microsoft's Visual Studio Code with PlatformIO extension installed. Setting up PlatmormIO is easy, but requires help from Github user maxgerhardt. Here's a link to his fork for the T-962-improvements repository... maxgerhardt's Repository of Forked T-962-improvements

To make it happen, you only need to change/add files found in his main Github repository directory ( boards/lpc2134_01.json, Makefile, create_version.py, custom_upload.py, fix_linkflags.py, lpc21isp_linux, lpc21isp_win.exe, and platformio.ini ).

[GitLang]

Maurizio, I used NXP's own LPCXpresso which was free dirct from NXP. Others have used Keil, but it's not cheap.

[Maurizio66blu]

Thanks for the info, I didn't know Visual Studio could also compile for ARM.
LPCXpresso and the Keil compiler are also interesting.
But I have another question: has anyone used the IAR compiler?