Still working on transmitter circuit
I am currently experimenting with the circuit produced by jessica Luan in her thesis
Its written for Microchip PIC but should work the same with the Arduino UNO/Mega.
The clock speed is faster on the arduino for a start (16Mhz as apposed to 10Mhz).
the pulse generation code listed above produces the 40Khz required for the transducer i have and provides 3 bursts per second.
if the arduino receives and processes the signal fast enough then i will be able the measure depth 3 time a second.
mindful the the speed of sound through water for 100m depth may not allow for 3 operations per second.
once a second should be easly acheiveable and thats good enough for me anyways.
i was given a tip the other day which was invaluable
when i measure the transducer signal use a scope lead switched to X10 as the signal is larger than expected 600v P/P
I got the advice just before i toasted my £175 china special scope.
so still working on transmitter circuit.
i have designed a pcb based on jessicas schematic and i am building it up in stages as i get each part to function
wish me luck.