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Overheating Mecool M8s Pro L and Pro + (and others ?) - Options ???
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Hi guys, I just recieved this item from gearbest, it comes with latest OTA friwmare built on 16 March 2018. This is new unit from factory I guess, maybe it will be better than yours. What .apk should I use for cpu temp? And how do I isntall it? How on normal android? Can i just use usb stick? I installed AIDA64 from GP, shows 52C standy, is it okay or abnormal?
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KSD970 - In-situ testing using thermal paste - Quick results for my test samples
KSD9700 NO
40C - Tested Closes at 41.2C
45C - Tested Closes at 47.5C
45C - Installed in Pro L with std. Heatsink and 30mm Pi Fan
All at ambient 21C
20% CPU at 1500mHz
Fan switches On at 55C CPU-Temp
Reset to Off at 47C Cpu-Temp - Fan cycles Off-On-Off ...
Idle Box - Leanback Launcher screen
Fan stays Off - CPU-Temp 48-50C (Ambient 21C)
Summary
40C
- Not tested but the 40C - May switch on when idling dependant on ambient temp. Switch on with any increased load.
45C
- 45C KSD9700 will not start the fan when idling .. will cycle the fan when watching YouTube etc. .. Will keep the fan on when using higher load apps.
50C
- Not tested - Should start fan when there is an appreciably high load but stay off when lower load like YouTube is in use.
55C
- Over-temp protection - Only switches on at high temperatures.
HTH
YMMV
e&oeLast edited by P.X; 13 April 2018, 15:36.
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Originally posted by diabolyk View Post
ok on the 5V it will turn only when box is power on and stop when power off and plugged ?
What's the value of the resistor you have put on it ?
You have to choose resistor based on Fan resistance and desired voltage.
Lots of posts on methods of determining ...
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Originally posted by P.X View Post
Yes.
Power to the box is power to the UART 3.3V Pin.
That is why we have moved to using 5V USB power with resistors.
You could use the UART 3.3V with a KSD9700, but that is more expense (resistor is about 10-20p / 20cent)
Depends on personal preferences ...
What's the value of the resistor you have put on it ?
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Originally posted by P.X View PostThe particular sample of a 55C switch I have now would work as a protection for absolute over temp fan switching, which may be what some prefer.
I want to get the fan on earlier so that the CPU is as unstressed as possible - but, not on when idling or doing low intensity stuff.
We shall see ...
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Originally posted by diabolyk View Post
you mean that it will turn all the time ? also when box is off but already plugged ?
Power to the box is power to the UART 3.3V Pin.
That is why we have moved to using 5V USB power with resistors.
You could use the UART 3.3V with a KSD9700, but that is more expense (resistor is about 10-20p / 20cent)
Depends on personal preferences ...
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The particular sample of a 55C switch I have now would work as a protection for absolute over temp fan switching, which may be what some prefer.
I want to get the fan on earlier so that the CPU is as unstressed as possible - but, not on when idling or doing low intensity stuff.
We shall see ...
Leave a comment:
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Originally posted by clarkss12 View Post
I am watching this closely....... I am confused about what you said on switching OFF. It turns the fan on at 78C, but what temp does it turn the fan OFF??
Nominal-55C Switch
Switch ON Temp 78C (CPU-Temp -- Probe Temp 53.6C)
Switches OFF at 68C (CPU-Temp)
I'll try a 40C when it arrives ...
The trouble is these little switches have pretty wide manufacturing tolerances can be +/- 5C of nominal ON Temp and OFF defined as ON-15C(+/-5C)
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Originally posted by P.X View PostKSD 9700 NO switch
Just tested 55C Switch and only switches on at 78C (Probe Temp 53.6C)
Has to be well attached thermally to get to switch-off temp !
I am guessing a 45 or 50 switch would be better.
Item number 322989226698 on the Bay UK - Great seller. Super fast delivery.
The Normally Open version of KSD 9700 is needed - It has a crossed out Tower Kanji on it.
Some sellers show wrong version in pictures (same pic for both?)
Write a note - Must be version Open Circuit at Room Temp.
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KSD 9700 NO switch
Just tested 55C Switch and only switches on at 78C (Probe Temp 53.6C)
Has to be well attached thermally to get to switch-on temp !
I am guessing a 45 or 50 switch would be better.
Item number 322989226698 on the Bay UK - Great seller. Super fast delivery.
The Normally Open version of KSD 9700 is needed - It has a 开 Kanji (Crossed-out Tower?) on it.
Some sellers show wrong version in pictures (same pic for both?)
Write a note - Must be version Open Circuit at Room Temp.
Leave a comment:
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ok but can I connect it on 3.3V without resistor and diode ? (more simple to make)
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Originally posted by diabolyk View Postok so i should put it on 5v you think ?
or the gain of temperature between 5v and 3.3v is not interesting ?
3.3V UART supply is not switched.
3.3V or less is good speed for cooling and less noisy - I use a small resistor to get correct voltage/speed - see previous posts.
Best fan I have tried is Pi Fan @ about $1.21 on the Bay and comes with 4xscrews and nuts (not needed but it shows you which type I bought)
All the info should be somewhere in this thread.
Top-side 5V USB is only on a little resistor by the USB socket - very careful soldering required (see my vid)
Underside 5V is much easier and safer to solder to ....
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