Hello!
I would like to connect an Arduino Uno via RS-232, with this transmitter:
http://www.micronradiocontrol.co.uk/docs/dt/dt-tx1-k1-1.pdf
And to have as servo controller, on the receiving side, this receiver:
Can anyone instruct me with such a project?
Thanks a lot!
Roi Neustadt.
Good Morning, Tel Aviv! Hey there, Roi.
The binary encoding of those control bytes is really easy once you get a little experience.
As an example let us look at the Rudder bytes.
In the 16 byte array, do you know which two bytes they are?
Good! They are bytes 9 and 10, right! However, when the array in the sketch is referenced they will be CtrlBytes[8:9] or CtrlWords[4]. Don't worry about this now, you will understand it later when you are writing and debugging your sketch.
If the position info is at the minimum it is all zeros and the Rudder Control Word (2 bytes) is what?
0b000 011 00 0000 0000 = 0x0C00
If the position is in the middle, the 10 bit position is what in decimal?
Hint: Open the Windows Calculator and put it in Scientific mode first and later in Programmer mode.
2^10 = 1024, so half of that is 512. And (512 - 1) = 511, so, in binary what is that? 0b01 1111 1111
The next step is to put that value into the Rudder Control Word. See the underlined part above? It gets modified and the other bits remain the same.
0b000 011 01 1111 1111 = 0x0DFF
Now, I hope you can see what the Rudder Control Word will be at maximum servo deflection. Sorry, but it is not 0x0EFF. 
Make a small spread sheet table with 5 columns and 9 rows and fill it in. Here is an example of how I might get it started:
| Chan # | Chan Name | Min Ctrl Word Value | Middle Ctrl Word Value | Max Ctrl Word Value |
|---|---|---|---|---|
| <word 1 of 8> | <Check Sum> | 0x0000 | 0x7FFF* | 0xFFFF |
| 0 | ||||
| 1 | ||||
| 2 | ||||
| 3 | Rudder | 0x0C00 | 0x0DFF | ? |
| 4 | ||||
| 5 | ||||
| 6 |
*Remember that it does not matter what value is in the 2nd byte of the the CheckSum control word.
Good Morning, Tel Aviv! Hey there, Roi.
The binary encoding of those control bytes is really easy once you get a little experience.
As an example let us look at the Rudder bytes.
In the 16 byte array, do you know which two bytes they are?
Good! They are bytes 9 and 10, right! However, when the array in the sketch is referenced they will be CtrlBytes[8:9] or CtrlWords[4]. Don't worry about this now, you will understand it later when you are writing and debugging your sketch.
If the position info is at the minimum it is all zeros and the Rudder Control Word (2 bytes) is what?
0b000 011 00 0000 0000 = 0x0C00
If the position is in the middle, the 10 bit position is what in decimal?
Hint: Open the Windows Calculator and put it in Scientific mode first and later in Programmer mode.
2^10 = 1024, so half of that is 512. And (512 - 1) = 511, so, in binary what is that? 0b01 1111 1111
The next step is to put that value into the Rudder Control Word. See the underlined part above? It gets modified and the other bits remain the same.
0b000 011 01 1111 1111 = 0x0DFF
Now, I hope you can see what the Rudder Control Word will be at maximum servo deflection. Sorry, but it is not 0x0EFF.
Make a small spread sheet table with 5 columns and 9 rows and fill it in. Here is an example of how I might get it started:
| Chan # | Chan Name | Min Ctrl Word Value | Middle Ctrl Word Value | Max Ctrl Word Value |
|---|---|---|---|---|
| <word 1 of 8> | <Check Sum> | 0x0000 | 0x7FFF* | 0xFFFF |
| 0 | ||||
| 1 | ||||
| 2 | ||||
| 3 | Rudder | 0x0C00 | 0x0DFF | ? |
| 4 | ||||
| 5 | ||||
| 6 |
*Remember that it does not matter what value is in the 2nd byte of the the CheckSum control word.
