my all Thermocouple HM min-build


 

WBegg

TVWBB Pro
DavidNP's design can suit 4 thermocouples. It just involves plugging 2 more $3 TC amp units into the system. The programming is already there, I believe. And the TCs don't HAVE to be built into the damper.

Hopefully, DavidNP will chime in to verify this.
 

DavidNP

TVWBB Member
WBegg is correct... it already support 4 TCs, just have to add the extra TC units. I just chose two for now to keep the size down and I've never needed/used more than 1 food probe for my cooks.....
 

RalphTrimble

TVWBB Diamond Member
So it seems all JohnW really needs is the modified HM code that works with the MAX TC amp, then he can use four of those MaX units in an external enclosure and wire them to the HM he already has.
 

WBegg

TVWBB Pro
So it seems all JohnW really needs is the modified HM code that works with the MAX TC amp, then he can use four of those MaX units in an external enclosure and wire them to the HM he already has.

Not sure if it's that simple. The code has been modified to operate with an ESP8266 WiFi unit as well, and I think it handles the JSON data quite differently. Also, the wiring on the board would need to be modified.

It's a good project, and a cheap one, and my suggestion to you would be to study it a little more, instead of chastising it as you seem to be doing in the last few posts.
 

JohnW

TVWBB Member
Hey guys, please keep it civil. Everyone has had great input & feedback and I am very thankful to all for that.
 

Dave Smith

TVWBB Super Fan
I don't SEE... where Ralph was "chastising anything.........he has given good ideas to JohnW.........seems to me that someone has a burr up his butt! But thats just my observation, why can't everyone just get along??
 

DavidNP

TVWBB Member
looking at that octo TC board is kinda 'neat'.... if it actually works (I found other shields/schematics online that have a TC multiplexed as well).... that would be super simple/cheap to support 4-8 TCs... Seems that it needs 125ms between switch/read but that's not too bad. You could read all 8 TCs just over 1 second.

a $3 max TC with a multiplexer chip would be simple to build (or get one of those already done)... maybe have single TC board for pittemp (fast read) and another 4-8 TC board food (slow read)....(HM only supports 4)
 

Tony L-Iowa

TVWBB Fan
Are you saying they have a single amp circuit for the TC and mulitiplex it to to the sensors to collect the readings? If so, I wonder if HM could be adapted slightly to use its single TC Amp circuit where the ports could be externally multiplexed and time divided for readings. For example, the HM could could be added with a how many external thermocouples are you using feature and then it could time split the readings sending a signal out the RJ45 jack to control the external multiplexer chip that switches the TC sensors which feed their data back to the currently existing TC port lines.
 

 

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