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Forum Index : Microcontroller and PC projects : My cool CMM2 (Hardware fan)

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Hark0

Newbie

Joined: 02/07/2020
Location: Spain
Posts: 31
Posted: 11:18am 10 Aug 2020
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Hi!

I add a fan to my CMM2 case.





Connected to pin 40 and ground.

I start / stop with software  


Not a very necessary.... just for fun!!!


My normal working temperature are 50~52 C

When I start the fan, down to 47 C.

     
ZX-UNO: ZX-Spectrum Clone with FPGA
 
matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 10580
Posted: 01:47pm 10 Aug 2020
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Pin 40 is used to reset the options and clear memory if pulled low on boot. Your wiring may be pulling pin 40 low through the coil on the fan. Suggest you use any other pin.
 
Hark0

Newbie

Joined: 02/07/2020
Location: Spain
Posts: 31
Posted: 04:57pm 10 Aug 2020
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  matherp said  Pin 40 is used to reset the options and clear memory if pulled low on boot. Your wiring may be pulling pin 40 low through the coil on the fan. Suggest you use any other pin.


Oki Doki... moving to another pin!

ZX-UNO: ZX-Spectrum Clone with FPGA
 
Grogster

Admin Group

Joined: 31/12/2012
Location: New Zealand
Posts: 9755
Posted: 09:56pm 10 Aug 2020
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I hope you have some kind of driver on that fan and are not just directly connected to the I/O pin.  

Cute addition, but the CMM2 does not require active cooling, or even passive cooling, so I am trying to understand WHY you did it.  Is it just to make it look cool?  

Pun intended....
Smoke makes things work. When the smoke gets out, it stops!
 
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