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10/18/2020 3:27 PM
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TC4+ Arduino coffee roaster shield (TC4-compatible)
harryf
Hi mg512, yes the fan and heater still work, just the temp readings are nonsense. With the bench psu wired to the DC in it works fine. I even switched on the fan psu at the same time, with the dc not connected in case it was causing some interference, and all was fine.
harryf

Quote

renatoa wrote:

May I ask if all the unused inputs are shorted ?


No, but I will try that tomorrow
harryf
Tried shorting the unused inputs, no difference. I connected the V in gnd to earth and bingo! Temperature readings are now good. I remember reading that one in a post. Just need to figure out why the heater slider does not move when using the heater buttons, but the fan slider moves with the fan buttons. However, the heater slider does control the heater OK.
mg512
Ah, are you connecting to your computer via USB, and is that computer connected to mains as well? Generally I would avoid that - either use a laptop that's on battery, or use Bluetooth altogether, when using the DC IN header.
harryf

Quote

mg512 wrote:

Ah, are you connecting to your computer via USB, and is that computer connected to mains as well? Generally I would avoid that - either use a laptop that's on battery, or use Bluetooth altogether, when using the DC IN header.


I am connecting via USB to a desktop PC that I built for this purpose, so the battery option is a non starter. However, it all seems stable now, so I'm happy. Should the heater slider follow the buttons?
renatoa
Yes, it should.
But this is an Artisan issue, not TC4.
You can experience some strange behaviours with sliders... like jumping to values multiple of 4 only, for the air slider, while the heater works fine... so no wonder another one.
harryf
Oh well, thanks anyway
sky0sea
Hello.

I am trying to make popper with TC4 + Arduino coffee roaster shield.

Preparation: TC4+, Arduino Uno or Arduino Mega, PSU 24V 5A,
Thermocouple (ring type, rod type), SSR 40A for heater,
I2C LCD, etc.

Arduino Uno's TC4+ temperature is output as serial Baudrate 115200. I uploaded the Artisan PID.
Output is connected to the Artisan PC program.

I want to use Arduino Mega.

TC4 + temperature of Arduino mega2560 is output as serial Baudrate 115200. I uploaded the Artisan PID.
I2C was wired.

It doesn't seem to connect to the Artisan PC program.

Is there anything I should consider to solve the problem?
mg512

Quote

sky0sea wrote:

Hello.

I am trying to make popper with TC4 + Arduino coffee roaster shield.

Preparation: TC4+, Arduino Uno or Arduino Mega, PSU 24V 5A,
Thermocouple (ring type, rod type), SSR 40A for heater,
I2C LCD, etc.

Arduino Uno's TC4+ temperature is output as serial Baudrate 115200. I uploaded the Artisan PID.
Output is connected to the Artisan PC program.

I want to use Arduino Mega.

TC4 + temperature of Arduino mega2560 is output as serial Baudrate 115200. I uploaded the Artisan PID.
I2C was wired.

It doesn't seem to connect to the Artisan PC program.

Is there anything I should consider to solve the problem?


The Mega is not supported. Even if the TC4+ worked on a hardware level (which I haven't looked into and am not sure about), I don't think aArtisan / aArtisanQ_PID are compatible with the MEGA, as they make use of some low-level features of the UNO's microcontroller.
hstan4

Quote

renatoa wrote:

Attached you can see the heater plate of the popper I am actually modding... just for the record.
The bimetal on the right has the same function and connection as the thermostat in hstan4 model.
The fiberglass cloth white tube on the left is an insulation for the thermal fuse we can see naked in the pictures above.
By far I prefer hstan4 model, there is non need to dismount heater plate in order to bypass the bimetal, and the thermostat leads can be used for SSR connections with less much tinkering.
...


How would the thermostat leads be used for SSR connections? After PMing another user, I’ve removed the brown/red and black wires from my thermostat and planned on routing the brown/red directly to the SSR, with the thermal fuse being used as the safety mechanism. I guess looking now it seems I could have left these on and used the black wire from the thermostat to connect to the SSR?
renatoa
Those wires already have crimped the female connectors for thermostat, so you can connect SSR directly to wires having matching male connector crimped, that can be bought as is, or manufactured on demand in electrical shops.
For some people who don't own a soldering tool this is a plus.
If you don't already have some tools in your home, great ! but if no... and start adding them to the bill... the tools required to modify a popper could cost more than the hardware of the roaster...

Did you started a separate thread about this build ? Because these details are no more related to TC4+, imo...
hstan4
I have not started a thread separately but am considering it. I did end up buying all soldering tools and everything else and am making progress on my build. I’m using 22awg wire and am wondering if it’s the appropriate size but otherwise am moving forward ok
renatoa
22AWG is 7 Amps rated for chassis wiring cases, i.e. open air and short distances, opposite to buried into walls and long distances, where ampacity is much lower.
For 110V US mains a popper heater draws about 12.5 Amps, so 22AWG will overheat.
Measured factory wires in my popper and they are 16AWG, rated at 22 Amps.
If no other wires available atm, and enough 22AWG stock, I would double the 22AWG you have.
Edited by renatoa on 09/04/2020 12:27 PM
hstan4
Got it. I've gotten some incredible help from Harryf, but am still having some final issues on which wiring to use for everything. Harryf suggested 18AWG which seems like it would also suffice, but would I also use 16/18AWG for the fan wiring to the (in my case) TC4+ or would it need to be smaller?

I believe all of the connectors I have fit from 22-16AWG, so it seems to me picking the 16 would make the most sense as it handles the highest amperage and shouldn't affect how it connects to the terminals.
mg512

Quote

hstan4 wrote:

Got it. I've gotten some incredible help from Harryf, but am still having some final issues on which wiring to use for everything. Harryf suggested 18AWG which seems like it would also suffice, but would I also use 16/18AWG for the fan wiring to the (in my case) TC4+ or would it need to be smaller?

I believe all of the connectors I have fit from 22-16AWG, so it seems to me picking the 16 would make the most sense as it handles the highest amperage and shouldn't affect how it connects to the terminals.


Personally I would err on the side of thicker wiring than necessary. It doesn't cost much and can save you a lot of trouble. One tip: Use differently coloured wiring for AC and DC! I.e. blue-brown-green/yellow for AC and black-red for DC. It may be tempting to just get one or two colours of wiring if you're going to use the same gauge for all of it, but you really don't want to accidentally mix up the wires later.
hstan4
Ok I've got 6 colors in the one I'm looking at and currently have for 22AWG. The same brand has an 18 option, would that suffice over 16?
renatoa
Yep, it is rated for some... 18 Amps, this is how I remember this wire, is the only whose AWG number approximates very close the ampacity Grin

I am using it almost exclusively in my multicopters, for currents in the 15-20 Amps range.
a1970gto
Do you have, or know where I can find a 3d model of a TC4? I'm finally getting my 3d printer and want to print a box for all of the electronics.

Thanks,
renatoa
You can start from Arduino Uno board model...
https://grabcad.com/library/arduino-u...o-uno-r3-1

... and place a second board on top...

Or modify an existing case for a shielded Uno:

https://pinshape.com/items/9418-3d-pr...tbeam-case
Coffeeed

Quote

renatoa wrote:

Attached you can see the heater plate of the popper I am actually modding... just for the record.
The bimetal on the right has the same function and connection as the thermostat in hstan4 model.
The fiberglass cloth white tube on the left is an insulation for the thermal fuse we can see naked in the pictures above.
By far I prefer hstan4 model, there is non need to dismount heater plate in order to bypass the bimetal, and the thermostat leads can be used for SSR connections with less much tinkering.
...


I am wondering if you are someone can advise me on disabling the thermostat or thermal cutoff (whatever it is that causes the popper to turn off when it gets too hot but allows you to use it again when it has cooled down again) on a DASH popper which is different from the ones that I have dealt with in the past.

See https://homeroasters.org/forum/viewth...post_72402
Edited by Coffeeed on 10/01/2020 6:12 PM
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