JSON Disconnects! Solved! JSON had started to randomly disconnect and I checked all the

CAD & CAM Tool Chain ChiliPeppr
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JSON Disconnects! Solved!

JSON had started to randomly disconnect and I checked all the connections from the computer to the TinyG with nothing found bad. Reloaded everything, still disconnecting.

I recently mounted a fan above the TinyG to cool things down. I removed the fan and the problem disappeared. I reinstalled the fan and the problem came back.

I have another fan I’ll hook up since I want the cooling. Seems like the current fan was generating some signals that were affecting the electronics on the TinyG.

Live and learn… the life in the world of CNC!

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That’s fascinating. Never would’ve thought a fan would cause that.

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It is a cheap fan from a cheap cpu case probably acting like a mini transmitter. It had been doing a good job cooling off the drivers.

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Fan voltage on tinyG set for 12 or Vmot?
12V Fan?
If you draw too much current from fan connection, you could cause the Vmot to 12V regulator to barf, dragging down tinyG supply voltage.

Mounting Fan so that it blows on bottom of tinyG is actually more effective. The heat slug driver packages dump a lot of heat into the PCB layers, bottom provides a cleaner removal surface

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Thanks Carl. I’ll see about a different mounting. Fan is connected to the 12v side. Fan had not been a problem when mounted on the side.

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This is actually a tinyGV9, but same idea works well

missing/deleted image from Google+

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Thanks Carl, I can do that!

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I found the design file, if helpful
https://drive.google.com/open?id=0B22T_pmL-89pamppSzRYZm9PRXM

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I use the same approach with fan mounted on the bottom side and connected to TinyG 12V output, works simply great.

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OK. Made a platform for the fan and TinyG with the fan on the bottom. No interference now and it works great and allows full access to the top of the TInyG. Looks good too!