3 ms·
I used one of the codes on reddit. Though it looks like it's free now. Nice work! Couple of thoughts: - I only have ear phones with a mic. It wasn't immediat
by syncerr 15y ago
I used one of the codes on reddit. Though it looks like it's free now.
Nice work!
Couple of thoughts:
- I only have ear phones with a mic. It wasn't immediately clear how I should measure something. Perhaps a tutorial? If I hadn't watched the video first, it would have been difficult.
- It's loud, is there a different frequency that could be used?
- Without any other background info, it leads one to think that the temperature is the only additional variable in the equation. Wouldn't it then be possible to tell the temperature with a known distance?
- Unless I have multiple iOS devices, I can only measure just past a meter (from the video). Combining this with the fact that it's not very precise, it would be much more useful if I could measure longer distances (e.g., sonar).
- X-Istence 15y agoFree? I still see it listed as 99 cents in the app store.
- greenale 15y agoThanks for your feedback. In theory it would be possible to tell the temperature if you have a know distance. The only problem seems to be that the clock of the ADC/DAC is often not running exactly at its nominal frequency. So, if you have a known distance, slide the temperature slider until the result matches (this works even after the measurement is complete). I've thought about this problem but decided against having an additional slider for the clock calibration, because I think that would have been to difficult to understand.