connection TTL in arduino uno

Projects General Guidance
1

how to make communication serial arduino uno to wireless module KYL-200U ???
wiring and programing code ???

2

The body of your post seems to have little to do with the question.
Anyway lookup the vertuial wire libary for communications.

3

I used virtual wire but is not function and can't connect

4

So tell us how you have wired it up. A schematic of this would be good, much better than words, also the code you are trying to use should be posted in the correct code tags.

5

This is the wiring wireless module,, I only use RxD and TxD TTL to arduino uno

This is Rx code

#include <VirtualWire.h>  // you must download and install the VirtualWire.h to your hardware/libraries folder
#undef int
#undef abs
#undef double
#undef float
#undef round
void setup()
{
    Serial.begin(9600);    

// Initialise the IO and ISR
    vw_set_ptt_inverted(true);    // Required for RX Link Module
    vw_setup(2000);                   // Bits per sec
    vw_set_rx_pin(23);           // We will be receiving on pin 23 (Mega) ie the RX pin from the module connects to this pin.
    vw_rx_start();                      // Start the receiver
}

void loop()
{
    uint8_t buf[VW_MAX_MESSAGE_LEN];
    uint8_t buflen = VW_MAX_MESSAGE_LEN;

    if (vw_get_message(buf, &buflen)) // check to see if anything has been received
    {
    int i;
     // Message with a good checksum received.
        
    for (i = 0; i < buflen; i++)
    {
        Serial.print(buf[i]);  // the received data is stored in buffer
        }
    Serial.println("");
     }
}

and this is TxD code

#include <VirtualWire.h>  // you must download and install the VirtualWire.h to your hardware/libraries folder
#undef int
#undef abs
#undef double
#undef float
#undef round
void setup()
{
     // Initialise the IO and ISR
    vw_set_ptt_inverted(true); // Required for RF Link module
    vw_setup(2000);                 // Bits per sec
    vw_set_tx_pin(3);                // pin 3 is used as the transmit data out into the TX Link module, change this to suit your needs.
}

void loop()
{
    const char *msg = "LMR-II Rocks";       // this is your message to send

   vw_send((uint8_t *)msg, strlen(msg));
   vw_wait_tx();                                          // Wait for message to finish
   delay(200);
}

datasheet.eeworld.com.cn_KYL-200U-24.pdf (474 KB)

6

I only use RxD and TxD TTL to arduino uno

Have you connected the grounds together?

7

yes, of course

with ground and VCC 5V of both,,
but still no response(connected)

8

i want to ask about that topic,
i use KYL-200l but i dont know how to use it,
can you explained me how to wairing and ardunio code about KYL-200l ??

Thank you