I am currently running a project with 2 TinyDuinos and 2 TinyShields 433MHz Radio (SI4432) in order to pass 3 axes (x , y ,z) from one to the other from long distance.

I have tried

  • to concat the axes as one string and send the string,
  • to send an array like string axes = { x , y , z } to the receiver (of course the variables are already defined),
  • send only one string. In this case I have only the first 2 letters of the string. For example if the string was string first = "456" , I would get "45" on the receiver

The Radio shield's examples uses uint8_t type and arrays to send and receive the data, I have already tried to cast the string to char* and then to uint8_t and nothing different happens. Maybe I am missing something.

Below there are my code screen shots. I will put 2 links for the examples of the transmitter and the receiver I got some code from

Similar Project : https://tinycircuits.com/blogs/learn/121634375-football-play-calling-watch-tutorial

Radio Shield Page: https://tinycircuits.com/products/433mhz-long-range-radio-tinyshield

TinyDuino Main Shield : https://tinycircuits.com/collections/all/products/tinyduino-processor-board

Code Screenshots

Transmitter code

Receiver code

Output from Receiver

  • 3
    Please add the code in your question, don't use images/screenshots. This allows easier editing by others and more crucially helps the search engines. – MichaelT Oct 16 '18 at 0:21

For this kind of thing you need to craft a packet to contain your data. The best method is to use a struct.

struct coords {
    int x;
    int y;
    int z;

Then you can define a variable from it:

struct coords myCoords;

And set individual values:

myCoords.x = 23;
myCoords.y = 180;
myCoords.z = -3817;

Now you can cast it to whatever type you need for sending:

manager.sendtoWait((uint8_t *)&myCoords, sizeof(struct coords), SERVER_ADDRESS);

Receiving is done in much the same way:

struct coords recCoords;
uint8_t len = sizeof(struct coords);
uint8_t from;

if (manager.recvfromAck((uint8_t *)&recCoords, &len, &from)) {
    Serial.print("X = ");
    Serial.print("Y = ");
    Serial.print("Z = ");

In future please post your actual code, not pictures of your code. It makes it a real pain having to keep scrolling up and manually typing in bits of your code rather than being able to copy-and-paste a couple of lines.

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