In reply to Giovanni Santostasi's message of Tue, 28 Dec 2021 17:58:27 -0800: Hi, [snip] >Anyway, probably sound is the best and cheapest mean to transfer the info >on such a short distance (is the distance an open space or are there >buildings?).
Open space. >It would be easy to create a device that can separate sound >based on frequency or loudness (Arduino hooked to a microphone). If it is >only a bit it needs to identify low frequency from high frequency and you >got your 0 and 1. Actually a single fast beep would do the job. Yes, this is one method I was considering. I'm trying to keep the transmitter energy low, though for just one bit, the power can be reasonably high, for a very short period. Part of the problem if focusing the signal onto the receiver (both fixed). This tends to complicate things. Have also considered a laser pointer. Wireless tends to get too complicated. Normal WiFi is out of range. I don't want to have to dig a 50m ditch to lay a wire, and I don't want a wire running through the air. A laser would actually be nice, if I could be sure that cheap detectors were available. Would a laser pointer active a solar cell sufficiently to create detectable signal at 50m? Any one got one handy that they could try for me? Regards, Robin van Spaandonk <mixent...@aussiebroadband.com.au>
