This is what I am getting from this circuit.

 

Sir, I know I am not good at programming. First of all really sorry to disturb you.
What I want is GPS and Echo sounder messages and also motor and battery messages to be shown at one place.
As you know I am using a radio link. so what should I do now?

Eric was giving excellent advice. My only intention was to clear up a little confusion you seemed to have about what he was saying. I will say one last thing, in case my impression is correct about your confusion but leave the rest to him because he will be much more help to you than I can be.

You have four serial devices that produce messages asynchronously. You have to receive the messages as the devices produce them and then multiplex them onto the one radio channel. This means your MCU will have to be able to talk to the four devices, meaning you need four serial ports.

Your MCU itself has the capacity, but your board isn't connected to them. You need to either add ports to the board or buy one that has the connections. The rest is programming.

I will leave it to Eric to help you, he is much more capable of doing that than I am.

 

Eric was giving excellent advice. My only intention was to clear up a little confusion you seemed to have about what he was saying. I will say one last thing, in case my impression is correct about your confusion but leave the rest to him because he will be much more help to you than I can be.

You have four serial devices that produce messages asynchronously. You have to receive the messages as the devices produce them and then multiplex them onto the one radio channel. This means your MCU will have to be able to talk to the four devices, meaning you need four serial ports.

Your MCU itself has the capacity, but your board isn't connected to them. You need to either add ports to the board or buy one that has the connections. The rest is programming.

I will leave it to Eric to help you, he is much more capable of doing that than I am.

I appreciate your advice. Just guide me through the process and I will change whatever you say. If this MCU can work with my requirements I am ready to use it. I can use Arduino instead of this circuit board. After that, I will design my circuit.

 

I appreciate your advice. Just guide me through the process and I will change whatever you say. If this MCU can work with my requirements I am ready to use it. I can use Arduino instead of this circuit board. After that, I will design my circuit.

Up in post #33 @ericgibbs provided a link to a capable board. Get one of those and then he can help you complete this.

 

Can a blue pill STM-32 will work?

 

Can a blue pill STM-32 will work?

I can't tell if the blue pill has enough serial ports but what Eric suggested does, the actual Arduino Mega board does. I'm sorry I just don't know enough about the STM32 boards.

 

hi ume,
Are you planning to buy a suitable MCU, like a Arduino 2560.?

E

 

Hi,
So that I can help you, I need the following information.

The baud rates, data format, and Data Update rates, also is it RS232 voltage levels or TTL.

GPS receiver data output………

Echo Sounder output data….

Motor unit output data….

Battery voltage measuring unit…..

Also does the Radio transmitter Serial Data input, require RS232 or TTL levels…..

E

 

Pardon me sir, can we make a mux and demux to send messages?

 

Hi,
So that I can help you, I need the following information.

The baud rates, data format, and Data Update rates, also is it RS232 voltage levels or TTL.

GPS receiver data output………

Echo Sounder output data….

Motor unit output data….

Battery voltage measuring unit…..

Also does the Radio transmitter Serial Data input, require RS232 or TTL levels…..

E

Eric, I was wondering whether any of the peripherals supports polling. That might help reduce complexity.

 

hi,um,
Please answer post #48.
E

 

Hi,
So that I can help you, I need the following information.

The baud rates, data format, and Data Update rates, also is it RS232 voltage levels or TTL.

GPS receiver data output………

Echo Sounder output data….

Motor unit output data….

Battery voltage measuring unit…..

Also does the Radio transmitter Serial Data input, require RS232 or TTL levels…..

E

Baud Rate : 9600
Data Format : ASCII characters
Data Rates : How can I check data rates?
All voltage level will be RS232
GPS data output is in NMEA and baud rate is 9600
Echo Sounder, Motor unit and battery voltage output data is in ASCII character
Radio transmitter is already in rs232.

 

I am getting all this data on my laptop by using Tera Term software.

 

I am getting all this data on my laptop by using Tera Term software.

hi,
How are you combining the 4 , RS232 input sources for feeding into your laptop at the same time.?

E

Update:
Using Ard 2560

 

Hope I can explain you my circuit.

 

One more thing, neglect motor pin. we are only controlling the motor from the digital output. Not receiving any data from motors.

 

CD74HC4067
Can I use this module?

 

hi ume,
I understand your circuit.
Look at these images.
E

BTW: I had my own international company designing and selling land and marine survey equipment like the project you are working on, for over 25 years..

 

hi,
Will a CD74HC4067 accept RS232 dual voltage level inputs.??

E

 

hi,
Will a CD74HC4067 accept RS232 dual voltage level inputs.??

E

I think no... because it only works up till 5V