September 20, 2017

GPS and Time Nuts

I was minding my own business and out of the blue got an email from Skipp. He was asking me about some information I have online about the Promice ROM emulator. Our email conversations drifted into discussion of GPS microcontroller projects and he offered a lot of information which I am trying to preserve right here.

Time Nuts

Who would have thought? There is a group of people that are wildly enthusiastic about time keeping, which often includes fiddling with GPS devices. Send time-nuts mailing list submissions to To subscribe or unsubscribe via the World Wide Web, visit or, via email, send a message with subject or body 'help' to You can reach the person managing the list at When replying, please edit your Subject line so it is more specific than "Re: Contents of time-nuts digest..."


There are boat loads of these selling in the $5 to $10 price range. You can buy them on Ebay, AliExpress, or Banggood. They seem to have 4 wires. Power, Ground, Rx, and Tx. You give it 5 volt power. It apparently has a 3.3 volt regulator. Rx and Tx are at 3.3 volt logic levels, or so it seems.
Have any comments? Questions? Drop me a line!

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