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I have read both these, the problem with such transmitters is the antenna length. I only need to achieve 5-10 metres tho.
What data transmission rate is necessary? That may limit your choice of transmission medium.the thing im having dificulty figuring out is how itransmit and receive the data
Hate to state the obvious, but with 5-10 meters, why not just use cable?
What data transmission rate is necessary? That may limit your choice of transmission medium.
You could send the data as Morse code, using ultrasonic bursts.
You can buy depth gauges for under a $100.0 bucks, why would you want to build this thing?
https://www.scuba.com/scuba-gear-51...icator..html?gclid=CM7e9NKUz7ICFeaDQgod0RIALw
Ok, looks like im going to hit a small snag here, i will have a problem with echoing sound etc, does anyone have any idea how this could be stopped? Would i have to send and confirm each character in turn or is there another way?