Hello!
Got this one today, attached photos of PCB, as DGM said above, it's AVR based, and also it looks like have a different heater element.
I don't have a thermal couple to check how accurate is, but I had seen one comment in Aliexpress, some one says it's accurate, and as you can see it does not have a calibration.
Bought it for about 30€, I was able to take the Youyue 858D+ for the same money. So what do you think, it is have advantages to taking this instead of Youyue 858D+?
In case if it will be inaccurate, the custom firmware can be modified and loaded for it also, right?
Hey Guys,
I have a hacked 858D station an I am pretty happy with it. The station needs quite long to cool down if the fan speed limited (specially with the small nozzle), so I worked out a hack to make the speed switchable via Software. The Trick is to add a Transistor which shorts the potentiometer slider pin to ground. I used a BC547B, because I had it around, but any NPN Transistor should work. The current through the Transistor and the potentiometer bias resistor is about 5mA Which are 125mW on the Resistor.
On the Microcontroller side I used the until now unused PB3 (MOSI) Pin, because it should be easy accessible on most adapter boards. It is switched on when the hot hand piece is put in the cradle and also in Fan Test mode to get a accurate reference. I also improved the Handpiece-not-in-cradle-mode, because I think this way it saves some time on startup. Software is available on my GitHub page and will hopefully be merged to madworms Page.
Cheers,
I'd thought about that too, but I was kind of thinking that it could just be done in hardware. I kind of figured it would suffice to pull the wiper down whenever the optotriac drive was inactive.
You could use the reed switch signal to switch the transistor every time the heater is in the cradle. That should work too, the only downsides are, it doesn’t work in Fan test mode, and if the heater is switched on all the time due to a broken TRIAC.
You'll also need the DMM to measure the voltage on the ADC so that you can calculate the ADC scaling for the TC.
I mentioned this in a post a few pages back, or there's a sheet in the index spreadsheet for calculating the scaling factors.
Just took delivery of mine today.
https://www.ebay.co.uk/itm/858D-220V-SMD-Soldering-Desoldering-Station-Hot-Air-Rework-Gun-Tool-3-Nozzles/301966004104?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Had a quick look inside and it seems pretty well made. I took a pic of the boardLooks like the same one I have.
nc94
Just took delivery of mine today.
https://www.ebay.co.uk/itm/858D-220V-SMD-Soldering-Desoldering-Station-Hot-Air-Rework-Gun-Tool-3-Nozzles/301966004104?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Had a quick look inside and it seems pretty well made. I took a pic of the boardLooks like the same one I have.
nc94
Same board here.
I did some front pot calibration with a K-type Thermocouple and found the overshoot was not too bad.
Also found the results were more stable after a burn-in period, i.e. ran it at 400 for a 5 minutes, then perform the pot calibration.
Overshoot was about 5 to 10 degrees when heating upwards.
Low air flow (2 on dial)
100 set = avg 103 measured
200 set= avg 202 measured
300 set = avg 298 measured
400 set = avg 402 measured
Mid air flow (4.5 on dial) :
100 set = avg 97 measured
200 set= avg 194 measured
300 set = avg 298 measured , pot calibration point
400 set = avg 425 measured
High airflow (7 on dial)
100 set = avg 99 measured
200 set= avg 206 measured
300 set = avg 315 measured
400 set = avg 440 measured , largest error measured
Note, tests performed ramping the temp upwards, i.e. 100, 200 300 etc. The reverse (400, 300, 200 etc) produced odd unstable results, probably due to the heater handle having thermal mass and holding heat.
So not too bad, better than I was expecting.
PS, nosel was the middle one, about 8mm wide.
Tracker
Hello!
Got this one today, attached photos of PCB, as DGM said above, it's AVR based, and also it looks like have a different heater element.
I don't have a thermal couple to check how accurate is, but I had seen one comment in Aliexpress, some one says it's accurate, and as you can see it does not have a calibration.
Bought it for about 30€, I was able to take the Youyue 858D+ for the same money. So what do you think, it is have advantages to taking this instead of Youyue 858D+?
In case if it will be inaccurate, the custom firmware can be modified and loaded for it also, right?
Hello!
Got this one today, attached photos of PCB, as DGM said above, it's AVR based, and also it looks like have a different heater element.
I don't have a thermal couple to check how accurate is, but I had seen one comment in Aliexpress, some one says it's accurate, and as you can see it does not have a calibration.
Bought it for about 30€, I was able to take the Youyue 858D+ for the same money. So what do you think, it is have advantages to taking this instead of Youyue 858D+?
In case if it will be inaccurate, the custom firmware can be modified and loaded for it also, right?
Hello!
Got this one today, attached photos of PCB, as DGM said above, it's AVR based, and also it looks like have a different heater element.
I don't have a thermal couple to check how accurate is, but I had seen one comment in Aliexpress, some one says it's accurate, and as you can see it does not have a calibration.
Bought it for about 30€, I was able to take the Youyue 858D+ for the same money. So what do you think, it is have advantages to taking this instead of Youyue 858D+?
In case if it will be inaccurate, the custom firmware can be modified and loaded for it also, right?
Hello!
Got this one today, attached photos of PCB, as DGM said above, it's AVR based, and also it looks like have a different heater element.
I don't have a thermal couple to check how accurate is, but I had seen one comment in Aliexpress, some one says it's accurate, and as you can see it does not have a calibration.
Bought it for about 30€, I was able to take the Youyue 858D+ for the same money. So what do you think, it is have advantages to taking this instead of Youyue 858D+?
In case if it will be inaccurate, the custom firmware can be modified and loaded for it also, right?
Are these photos of a Youyue 858D+ ?
How have you found it’s performance?
Which supplier did you purchase from?
Cheers...
“If it matters to you please don’t buy”