I’d really appreciate some elaboration on how you “inverted” the signal so Arduino can use it with SoftwareSerial….I’m new to this and bought the same depth finder you used. Thanks in advance...
Reply #18
HI AshVLSI,
Would you mind sharing how you connected the transducer to the arduino, I really would like to do this myself as well, but do not know the pinout and if any extra electronics are required.
Regards,
Richard
BTW, NMEA0183 runs at 4800 baud.
btw fyi nmea 0183 can be used at any baud rate you set it too, it is not specified in the 183 standard to use only 4800.
flyfisher811:
I’d really appreciate some elaboration on how you “inverted” the signal so Arduino can use it with SoftwareSerial….I’m new to this and bought the same depth finder you used. Thanks in advance...
The data is transmitted using the RS422 differential signalling system. This gives good noise immunity when using long cable lengths.
The system uses two outputs, when one is high, the other is low, and vice versa.
The correct way to receive the signal would be to use an RS422 to TTL transceiver IC such as the MAX485.
However the OP didn't bother doing this, but merely made connections to just one of the two outputs.
In order to invert the signal, he simply connected to the other output.