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UnifiedEngineering / T-962-improvements

Improvements made to the cheap T-962 reflow oven utilizing the _existing_ controller HW
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Add module options to documentation #224

Open Resonanz opened 2 years ago

Resonanz commented 2 years ago

The Maxim 1-wire device is also available as a module, and cheaper than the device on its own...

https://www.dfrobot.com/product-164.html

... and it comes with wires and mounting holes for mounting away from the PCB is necessary.

southern-boy commented 2 years ago

Where do you and/or the group mount your module or place your MAX18B20 probe inside the T962?  Lay it on the bottom? Place it somewhere in particular?  Place it near the top? Lay it on the grate used to elevate the board above the bottom? Is there a better place to locate the probe or module?

Thank you

On 2/15/2022 3:47 PM, Alpha Particle wrote:

The Maxim 1-wire device is also available as a module, and cheaper than the device on its own...

https://www.dfrobot.com/product-164.html

... and it comes with wires and mounting holes for mounting away from the PCB is necessary.

— Reply to this email directly, view it on GitHub https://github.com/UnifiedEngineering/T-962-improvements/issues/224, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABZ4BKH5EZUUU57WMM7LRDTU3LQY7ANCNFSM5OQATNOA. Triage notifications on the go with GitHub Mobile for iOS https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675 or Android https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub.

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xnk commented 2 years ago

Always interesting when modules are cheaper than the components. In this case the module will likely interfere as the cold-junction sensing sensor ideally should be glued to the connector body, but feel free to add a link to the module in the wiki!

On 16 Feb 2022, at 00:47, Alpha Particle @.***> wrote:

 The Maxim 1-wire device is also available as a module, and cheaper than the device on its own...

https://www.dfrobot.com/product-164.html

... and it comes with wires and mounting holes for mounting away from the PCB is necessary.

— Reply to this email directly, view it on GitHub, or unsubscribe. Triage notifications on the go with GitHub Mobile for iOS or Android. You are receiving this because you are subscribed to this thread.

Resonanz commented 2 years ago

I bought the module today at about 60% of the cost of the device alone. It should arrive within a week. Btw, the + on the end of the IC part number differentiates the lead-free (Pb-free) version.

xnk commented 2 years ago

The 18B20 needs to be in thermal contact with the thermocouple terminals on the controller PCB (for cold-junction compensation), it is not meant to measure the actual oven temperature.

On 16 Feb 2022, at 08:03, southern-boy @.***> wrote:

Where do you and/or the group mount your module or place your MAX18B20 probe inside the T962? Lay it on the bottom? Place it somewhere in particular? Place it near the top? Lay it on the grate used to elevate the board above the bottom? Is there a better place to locate the probe or module?

Thank you

On 2/15/2022 3:47 PM, Alpha Particle wrote:

The Maxim 1-wire device is also available as a module, and cheaper than the device on its own...

https://www.dfrobot.com/product-164.html

... and it comes with wires and mounting holes for mounting away from the PCB is necessary.

— Reply to this email directly, view it on GitHub https://github.com/UnifiedEngineering/T-962-improvements/issues/224, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABZ4BKH5EZUUU57WMM7LRDTU3LQY7ANCNFSM5OQATNOA. Triage notifications on the go with GitHub Mobile for iOS https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675 or Android https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub.

You are receiving this because you are subscribed to this thread.Message ID: @.***>

— Reply to this email directly, view it on GitHub https://github.com/UnifiedEngineering/T-962-improvements/issues/224#issuecomment-1041177612, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAYSRD6JR4MTE2DVPDY7CBLU3ND3RANCNFSM5OQATNOA. Triage notifications on the go with GitHub Mobile for iOS https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675 or Android https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub. You are receiving this because you commented.

Resonanz commented 2 years ago

Mmm, I assumed it was measuring ambient (room) temperature... do I have that wrong?

Resonanz commented 2 years ago

Ok, I found this very good article titled "Cold Junction Compensation in Thermocouple | Maxim Integrate".

The website link is https://www.maximintegrated.com/en/design/technical-documents/app-notes/4/4026.html.

IIRC, Maxim bought Dallas Semi about 15 years ago, so the article connects Maxim to Dallas who make the silicon device.

Resonanz commented 2 years ago

A nice summary sentence or two from Example #1 in the above article is the following:

"A temperature-sensing IC, located in close proximity to the thermocouple connector, measures the temperature in the vicinity of the cold junction. This method is based on the assumption that the temperature at the IC is approximately the same as the temperature at the cold junction."

The "cold junction" referred to here is the junction where the thermocouple wires meet the connector contacts.

Thanks for the advice above guys. Feel free to add this stuff to the wiki.