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  • NTMMFTS commented on sbmull's instructable One component radio clock time transmitter6 months ago
    One component radio clock time transmitter

    Haven't tied this yet but I'm going to, it's called Poor Man's Tiny Tuner that simplifies the oscillator tuning process with ready-made sketch for attiny. http://forum.arduino.cc/index.php?topic=8553.0 . The author states that the oscillator can be as much as 10% off from the factory, which may explain the inaccuracy issues I had with the Digispark.

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  • NTMMFTS commented on sbmull's instructable One component radio clock time transmitter6 months ago
    One component radio clock time transmitter

    Thanks for the tips... Looks like the (or my) Digispark is just too unstable, keeps fluctuating a couple of kHz no matter what I do with the antenna or code values, so I'll probably have to read up on oscillator calibration if I want to stick with the Digispark. The real proof is that my wave ceptor second hand never moves to the W (work/stable) while receiving :-(. Yes, great watch, mine is a Japan model, all titanium with a white face and sapphire crystal - it's gorgeous like a Tag Twin Time but with a ton of features :-).

    Hi, I tried this with a Digispark but it wouldn't set my Casio Wave Ceptor Multiband 6 watch - always errors out. The antenna wire is in pin 6 - P1 on the digispark - with 5v from the Digispark 5v pin connected to the antenna near the board - see attached picture. It's definitely modulating at just below 60 kHz as tested with a sperry multimeter that has a hz function, but not sure how sensitive this watch is when the signal is about 1 kHz off. Also not sure if there's any interference from the USB connection itself which is how I'm powering everything. Any ideas why it's not working with a Digispark? I have a bare atmega16 on the way which I intend to try on a breadboard like your project, so hopefully that will work. I'd rather have the USART instead of using softserial and the ...see more »Hi, I tried this with a Digispark but it wouldn't set my Casio Wave Ceptor Multiband 6 watch - always errors out. The antenna wire is in pin 6 - P1 on the digispark - with 5v from the Digispark 5v pin connected to the antenna near the board - see attached picture. It's definitely modulating at just below 60 kHz as tested with a sperry multimeter that has a hz function, but not sure how sensitive this watch is when the signal is about 1 kHz off. Also not sure if there's any interference from the USB connection itself which is how I'm powering everything. Any ideas why it's not working with a Digispark? I have a bare atmega16 on the way which I intend to try on a breadboard like your project, so hopefully that will work. I'd rather have the USART instead of using softserial and the extra flash space so I can translate gps or ntp time for modulation on the AVR instead of having to use a companion program due to the limited space. Thanks for this example even if you don't have any comments about it not working on a Digispark :-).

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