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  • Timekeeping on ESP8266 & Arduino Uno WITHOUT an RTC (Real Time CLock)?

    I'm afraid that your conclusions and method are flawed at so many levels. I admire your attempt though. I am a bit of a time geek as my partner would testify. Accuracy depends on so many factors such as the time source you use to verify the time, the accuracy you track the time at and the hardware/software you produce.The nearest I have come to an accurate clock uses an NTP server and it is compared against the DCF77 signal pulses for comparison and it uses an RTC to generate 1 second pulses synchronised an NTP time server. I have a clock which is within 2 mS of the NTP server at all times. Trust me, this has taken a lot of work but, the RTC is vital to provide a synchronisable 1 second pulse.The unfortunate fact is that you cannot judge the accuracy of any clock without a reference wh...

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    I'm afraid that your conclusions and method are flawed at so many levels. I admire your attempt though. I am a bit of a time geek as my partner would testify. Accuracy depends on so many factors such as the time source you use to verify the time, the accuracy you track the time at and the hardware/software you produce.The nearest I have come to an accurate clock uses an NTP server and it is compared against the DCF77 signal pulses for comparison and it uses an RTC to generate 1 second pulses synchronised an NTP time server. I have a clock which is within 2 mS of the NTP server at all times. Trust me, this has taken a lot of work but, the RTC is vital to provide a synchronisable 1 second pulse.The unfortunate fact is that you cannot judge the accuracy of any clock without a reference which is why I use the DCF77 signal pulses to compare accuracy and this requires a Logic Analyser.

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  • AT command mode of HC-05 and HC-06 Bluetooth module

    Unless I'm missing something in your guide, you seem to be suggesting connecting TTL outputs directly to the HC-05/06 signal inputs. The signal inputs ARE NOT TTL compatible and should only be used with 3.3V logic levels. You need level shifters on the module's signal inputs.

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