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A project log for How to get high precision frequency standard ?

Now the time to get high precision frequency standard less than $10!

kodera2tkodera2t 09/22/2018 at 02:223 Comments

Now it's done in single board form! Two SMA connectors are GPS antenna and frequency counter input, connecting to PD5 of ATmega328 through single gate inverter element. Rotary encoder change gate time for frequency measurement. Coin battery (CR1220) keeps setting of NEO6M (8MHz clock generation..). The RED toggle switch can select the connection between CP2102N to NEO6M or ATmega328, which enables GPS monitor or Arduino sketch upload through USB. As same as most of my board, onboard Lipo battery charger is prepared. The Yellow toggle switch change the clock source of ATmega328, on-board 8MHz crystal or GPS trained signal. Actually NEO6M generate 8MHz even before GPS locking (with low precision) and after GPS clock capturing, it goes to atomic clock precision!. 

Here is the measuring result of a clock (1 MHz) generated from another GPS module. As you see it surely measuring.. Yes, it's battery operation!!

Discussions

Joel wrote 10/04/2018 at 23:39 point

i am looking forward to receiving mine.

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kodera2t wrote 10/05/2018 at 13:30 point

Thank you!! Please wait it a bit more. Your item already arrived in your near town now and will be delivered soon!!

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Makerfabs wrote 09/22/2018 at 08:06 point

congratulates~

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