Youyue 858D+ some reverse engineering + custom firmware

[jaaa1976]

which tools i need if i buy SR858D+ ESD Soldering Station ? for flash mcu...I have universal programmer MiniPro TL866A

[anman]

which tools i need if i buy SR858D+ ESD Soldering Station ? for flash mcu...I have universal programmer MiniPro TL866A

Buy in reliable source MCU atmega168 or 328 to replace atmega8L. If you yourself never soldered chip it is better to give in "capable hands". Solder the pins on the board J6 and program a new MCU, the port circuit programming.
Pinout terminals J6 SR858D board: 1-VCC, 2-MOSI, 3-SCK, 4-Rst, 5-MISO, 6-GND.
How to set fuses look at the enclosed picture.

[0xPIT]

Hey,

as I've got the cheapo version with the samsung proprietary controller, I'm considering to redo the PCB with a MAX31855.

Does anyone happen to know
1) the type of the thermocouple (K?)
2) if the thermocouple is floating or has ground connection? (the MAX31855 does not work properly if the TC has ground connection)

Thanks,

  - pit

[neutrino]

In Poorman's Electronic Projects blog there is a full schematic and teardown of BAKU 858D.

[Brenex]

I just purchased a Youyue from amazon and I'm excited for it to come and get to tinker with it. It comes in tomorrow. I'm totally happy with what I'm getting in to which is a basic unit that I can have fun messing around with as part of my hobby. It seems that Atmel hasn't been coming with the new youyues since around january or earlier so it looks like I'm going to have to see if a samsung/mk adapter is going to be necessary. I also read through the "Heart of Tech." of blog but it seems he stopped his replacement project in April. I reached out to him on twitter but haven't heard back.

[Brenex]

My unit just came in today from Amazon. Very happy with it! I made some modifications like switching the live and neutral wires as they go to the switch. The fuse was real and correctly connected to the live wire. The grounding wire to the metal shroud on the handle was just wrapped as can be seen in the last pic so I soldered it on. Also cleaned up one solder joint that was shorted with another incorrectly.







EXCELLENT QUALITY!








Too bad there is no sweet holographic QC sticker.





Seems to have been made June 22, 2016. Not bad.



I'm not sure what the empty socket on the back is for. It's connected to ground on the inside.



Hello little solder blob.













PCB labeled with 2015.08.21
Controller MK1841D3

[bitseeker]

Too bad there is no sweet holographic QC sticker.

Bummer! Looks pretty OK, otherwise.

I'm not sure what the empty socket on the back is for. It's connected to ground on the inside.

You can connect a grounding strap to it while doing your SMD rework.

Nice job with the touch-ups. Happy reworking!

[JackM]

My unit just came in today from Amazon. Very happy with it!

What type of tips did it come with? The turn-locking type or the nut and bolt friction fit type?

[neo__04]

Any source on where to buy these hot air stations?
Amazon won't ship to Australia so i have to find somewhere else.

Any good sources, with versions we know we can mod?

Thanks

[0xPIT]

I've found out the the thermocouple in my W.E.P. 858D+ model does not seem to have ground connection, which is good.

I started a new Project (Eagle 7) at https://github.com/0xPIT/Air858/tree/master/hardware

The PCB fits into the sub-40€ W.E.P 858D+ stations available from eb*y. The hardware seems comparatively OK, even has proper earth connection in the hand piece. PCB uses this odd-ball s*msung controller.

The intention is to simplify the schematic, using a MAX31855 to read the thermocouple, use single-MOSFET PWM for the fan, and a 126x64 OLED display, plus a rotary encoder alongside the two buttons. Some parts of the original hardware can be reused.

The idea is to use wave packet control in software, as I did for my https://github.com/0xPIT/reflowOvenController. So I need detection of zero-crossing. I think I'll eliminate the 2nd optocoupler (a dual antipolar led type) and detect the zero-crossing by tapping the signal from D5 and adding a 2nd diode to arrive at the desired 2x mains frequency.

Any suggestions? Feedback is welcome.

 - pit

[bitseeker]

Any source on where to buy these hot air stations?
Amazon won't ship to Australia so i have to find somewhere else.

Any good sources, with versions we know we can mod?

Thanks

I don't know about sources for Australia, but as far as models go, it seems the latest ones no longer use the ATmega microcontroller.

[Brenex]

My unit just came in today from Amazon. Very happy with it!

What type of tips did it come with? The turn-locking type or the nut and bolt friction fit type?

Turn lock which I prefer over the bolt on.

[stj]

126x64 OLED display
Any suggestions? Feedback is welcome.

 - pit

why not a colour TFT display?
then you can make full use of the colours for warnings etc.

[anman]

Any source on where to buy these hot air stations?
Amazon won't ship to Australia so i have to find somewhere else.

Any good sources, with versions we know we can mod?

Thanks

A successful example - atmega8L

[Brenex]

The author of Heart of Tech replied to me. Thought I would share it here, "temporarily on hold between work and moving. I'm determined to get it running again asap or at least start writing about the design process on my blog. Thanks for asking!"

[anman]

Board for BLDC Fan-speed mod attached  to the fan speed potentiometer on the double-sided tape.  Considering it an optimal solution   

 !! REMOVE R31 (10k, SMD 0805) on the main circuit board BEFORE adding this mod for SR858D. This disconnects the FAN voltage sensing (default state) going to PC5.

GND and VCC can be obtained from the findings for in-circuit programming.

[0xPIT]

126x64 OLED display
Any suggestions? Feedback is welcome.

 - pit

why not a colour TFT display?
then you can make full use of the colours for warnings etc.

Because not even my JBC has a color display, they fit without changing the cutout, and I had these regular OLED displays in my box.

[0xPIT]

My project for a replacement controller for the 858 has progressed, I've ordered the first batch of PCB today.

You can follow progress here:
https://github.com/0xPIT/Air858

[JackM]

I started a new Project (Eagle 7) at https://github.com/0xPIT/Air858/tree/master/hardware

Any suggestions? Feedback is welcome.

I only have some suggestion regarding the schematic. I would change the heater drive header so the AC live line is the one being switched, instead of the neutral side. Right now the neutral line is being switched by the triac and the live line is always on the heater element in the handpiece. Safety wise I think it's better to have it the other way around.

[0xPIT]

I started a new Project (Eagle 7) at https://github.com/0xPIT/Air858/tree/master/hardware

Any suggestions? Feedback is welcome.

I only have some suggestion regarding the schematic. I would change the header drive so the AC live line is the one being switched, instead of the neutral side. Right now the neutral line is being switched by the triac and the live line is always on the heater element in the handpiece. Safety wise I think it's better to have it the other way around.

I guess that would just mean changing L and N when wiring the AC connection. (Note that we have reversible plugs in most parts of the EU)

[JackM]

I guess that would just mean changing L and N when wiring the AC connection. (Note that we have reversible plugs in most parts of the EU)

Yeah, that would be a simple fix when wiring up the board. Otherwise it's just a labeling issue on the schematic that would need changing.

[netdudeuk]

WEP -

https://www.ebay.co.uk/itm/252057037600

Kaleep -

https://www.ebay.co.uk/itm/152293215180

Is there a view on which of these is safer, more reliable, more accurate and more modable ?

Thanks

[tyfon]

Hi to all!

Just got the adapter boards from GiantGnome. Everything seems to work fine, but I'm not sure which firmware I should put on exactly.
I've got the YouYue858D+ 230V Version with the MK1841D3 controller. PID seems overshooting a little bit, but it's not too bad. Do I have to modify the firmware like Gixy and wguibas did?
Unfortunately I don't have any way to measure the actual temperature right now.

Well, found some time to work on this.
I took the V1.45 version of the software and made the modifications from Wayne (wguibas) on the relationship between adc_raw and temperature, as well as min and max values for fan speed.
His formula is temp = adc_arw/2.4 + offset (33 by default).
I flashed the software and made a complete set of measurement. I don't know why, but this time the results are much better than before: the bias between target and mesure from 80°C to 400°C stay inside +/- 1 or 2 degrees: excellent! I made a linear regression to determine the equation and found:
temp = adc_raw/2.456 + 35, which is pretty close to the software's formula above, so I changed nothing.
Many thanks to Robert and Wayne!
Denis

Kaleep 858D+ with MK1841D3 chip

Thank you!

[tyfon]

I found a demo board for the SHTC1 Temp and Humidity sensor lying around and tested the temperature myself.
The sensor goes only up to 100°C, but it seems like the formula from Gixy with 2.4 approximates the temperatures pretty well.
Only the correct PID values are yet to be found for the 230V version. I've got huge over and undershoot, but at least now I see the real values on the display.

[peterloron]

Hello, folks. I have one of these with the main board marked "youde 858DV2++" and the microcontroller is a S3F94C4EZZ-DK94.

I've gone through the thread(s) here but I'm not clear if anyone has made an adapter for that chip yet.

Anyone in the know? Thanks.