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It's possible. Phone transducers can send/receive up to around 20kHz.
Most adult humans can't hear beyond about 15kHz.
You'd need to keep in mind transmission distance which decreases with frequency which can be either a feature or a bug.
You can apply the same principles as Satoshi Jump using DTMF + The Goertzel Algorithm for tone detection. DM one of us if you'd like to learn more.
It's possible. Phone transducers can send/receive up to around 20kHz.
Most adult humans can't hear beyond about 15kHz.
You'd need to keep in mind transmission distance which decreases with frequency which can be either a feature or a bug.
You can apply the same principles as Satoshi Jump using DTMF + The Goertzel Algorithm for tone detection. DM one of us if you'd like to learn more.