Gyro simulation

Projects Programming
1

Gyro transmit a signal that looks like'' $HEHDT,129.5,T*20 '', with 129.5 degrees being the heading of the device. I created a program that translate this values out of the usb on a Arduiono Leonardo board. I also put in for serial1, which is output 0 & 1(Tx, Rx). And when I listen to the signal through Putty (open-source terminal emulator), I only read noise and if I listen from the micro-usb port I read the expected values.
The thing that I want is that I want to read the same signal through digital output 0 & 1.
Here is a copy of my program:
int x;
void setup() {
//initialize the serial
Serial.begin(4800);
Serial1.begin(4800);
x=0;
}

int checksum(char *s) {
int c = 0;

while(*s)
c ^= *s++;

return c;
}

void loop() {
char cmd[30];
char buffer[30];
sprintf(cmd, "$HEHDT,%03d.0,T2", x);
sprintf(buffer,"%s*%02X\r\n",cmd,checksum(cmd));

Serial.print(buffer);
Serial1.print(buffer);

x+=1;
if(x==360)x=0;
delay(1000);

}
I don't think there is a problem with the program, but I think maybe my knowledge about RS232 and signal generation is not enough.
Do you have any suggestions?

2

I see nothing wrong with the code (except missing code tags but these are a crime on this new forum )
Can you post a schema (drawing) how everything is connected?

3

The connection looks like this

2014-10-21 20.46.03.jpg
2014-10-21 20.46.03.jpg2688×1520 404 KB

4

Yes! Please answer this post I have a similar problem with my Leonardo. I read something about that the Leonardos serial1 port (Digi 0&1, Tx1 & Rx1) only give out UART TTL (5V) serial communication. And the USB gives out a CDC communication. I tried to learn about the difference on what I could find online but I couldnt distinguish why one would work and the other wouldnt. Does anybody knows something about it?

5

What is your project about?
For me it's really strange that I receive only noise. I tried with all possible baud rates, and the noise is different all the time, also when I change the delay the noise income is following the rule.

6

Because the "Antenna Control Unit" has Rx+ and Rx- pins I think it is using a differential signal like RS485. Try connecting Rx+ to Ground and connecting the Arduino TX to RX-. If that doesn't help, try connecting Rx- to Ground and Arduino TX to Rx+. If both fail you should get a chip to translate between TTL Serial and whatever signaling the Antenna Control Unit expects (RS485?)

7

The thing is that I'm transfering the signal to NMEA first and after it goes to ACU. And NMEA is using RS232 type of singnal.
I will try your suggestions and write the results.