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YOUYUE 858D+ hotair station — teardown
This device seems to be a clone of several other branded ones out there. The Atten / Aoyue 858 come to mind ;-) I bought it on ebay for 38€ delivered. MAKE SURE TO ALWAYS UNPLUG THE MAINS CABLE BEFORE...
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YOUYUE 858D+ hotair station — usage & quirks
In a previous post I had taken a look at the innards of said soldering station. Now it is time to see if it is usable. I tested it in several ways… It is pretty intuitive to use: Turn the air-speed...
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YOUYUE 858D+ hotair station — reverse engineering #1
The YOUYUE 858D+ I have in my possession uses an AVR ATmega8 microcontroller to control the fan-speed, drive a 7-segment display, read 2 buttons and drive the TRIAC via an opto-isolator. I will not...
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YOUYUE 858D+ hotair station — reverse engineering #2
In part one I dealt with the very basics: fan control, buttons and the display. Now it is time to attack the business end of this device! Safety warning / disclaimer: Please understand that operating a...
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YOUYUE 858D+ hotair station — reverse engineering #3
After tweaking some control loop parameters and adding a hard-limit for the temperature (heater cut-off + resetting the error term, effectively restarting the loop), the massive temperature overshoots...
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YOUYUE 858D+ hotair station — reverse engineering #4
Possibly (and hopefully) the last post in this little hot-air station series. I’ve opened and closed that device far too often – and popped out the chip multiple times in each instance. You see the...
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YOUYUE 858D+ hotair station — reverse engineering #5
The lack of an ISP connector on this board has given me a lot of grief. This little adapter board will solve that problem once and for all. It also provides a couple of through-hole pads for...
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YOUYUE 858D+ hotair station — reverse engineering #6
Adding some more stuff is always fun. Inspired by a recent blog-post on dangerousprototypes.com, I chose to improve the fan-monitoring. The unmodified device only monitors fan voltage, which is close...
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YOUYUE 858D+ hotair station — BLDC Fan-speed mod
I’ve finally forced myself to layout a small board. It’s been far too long anyway. It consists of these building blocks: reference voltage, comparator, RC low-pass, gain. There are better methods for...
View ArticleYOUYUE 858D+ hotair station — Bugfix release V1.44
I’m glad to announce that the annoying watchdog issue has finally been fixed. It was a dumb error on my side, combined with a prevalence in some ATmega chips to have certain binary values in...
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YOUYUE 858D+ hotair station — Release V1.45
A small but helpful upgrade, if you’re into acquiring your own temperature calibration data. At some undetermined time in the future this might be expanded to a full multi-point calibration mode. The...
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