I am using an radar which is based on rs232 output data. I use MAX232 to TTL convertor with arduino. Radar givs data in 14 byte in hex i want to read it on serial monitor. what can i do ,Below i use sofwareserial.h library to read data but failed
#include <SoftwareSerial.h>
const int RX_PIN = 2; // Replace with your actual RX pin
const int TX_PIN = 3; // Replace with your actual TX pin
SoftwareSerial mySerial(RX_PIN, TX_PIN);
void setup() {
Serial.begin(115200); // Serial monitor for debugging
mySerial.begin(115200); // SoftwareSerial for connecting to the MAX232
}
void loop() {
// Check for and print the raw data from the radar
printRawRadarData();
}
void printRawRadarData() {
// Check if data is available from the MAX232
while (mySerial.available()) {
char receivedChar = mySerial.read();
Serial.print(receivedChar,HEX);
}
}
If your radar serial output is really at 115200 baud, then you need to be looking at an Arduino board with more than 1 hardware serial port. Maybe a MEGA2560 based board instead.
oh sorry i am also using rx pin , tx and rx is 2,3 i have also tried 0,1_10,11 but did not get any response .yes radar gives data on 115200 baud rate
#include <SoftwareSerial.h>
const int RX_PIN = 2; // Replace with your actual RX pin
const int TX_PIN = 3; // Replace with your actual TX pin
SoftwareSerial mySerial(RX_PIN, TX_PIN);
void setup() {
Serial.begin(115200); // Serial monitor for debugging
mySerial.begin(115200); // SoftwareSerial for connecting to the MAX232
// Send the "read radar parameter" instruction
sendReadRadarParameterInstruction();
}
void loop() {
// Check for and print the raw data from the radar
printRawRadarData();
}
void sendReadRadarParameterInstruction() {
// Instruction data packet based on Table 3
byte instructionPacket[] = {
0xAA, 0xAA, // Frame header
0x20, 0x00, // Frame type (low byte first)
0x71, // Instruction of read parameter
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Reserve
0x55, 0x55 // Frame tail
};
// Send the instruction packet to the MAX232
mySerial.write(instructionPacket, sizeof(instructionPacket));
}
void printRawRadarData() {
// Check if data is available from the MAX232
while (mySerial.available()) {
char receivedChar = mySerial.read();
Serial.print(receivedChar);
}
}
#include <SoftwareSerial.h>
const int RX_PIN = 19; // Replace with your actual RX pin
const int TX_PIN = 18; // Replace with your actual TX pin
SoftwareSerial mySerial(RX_PIN, TX_PIN);
void setup() {
Serial1.begin(115200); // Serial monitor for debugging
mySerial.begin(115200); // SoftwareSerial for connecting to the MAX232
// Send the "read radar parameter" instruction
sendReadRadarParameterInstruction();
}
void loop() {
// Check for and print the raw data from the radar
printRawRadarData();
}
void sendReadRadarParameterInstruction() {
// Instruction data packet based on Table 3
byte instructionPacket[] = {
0xAA, 0xAA, // Frame header
0x20, 0x00, // Frame type (low byte first)
0x71, // Instruction of read parameter
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Reserve
0x55, 0x55 // Frame tail
};
// Send the instruction packet to the MAX232
mySerial.write(instructionPacket, sizeof(instructionPacket));
}
void printRawRadarData() {
// Check if data is available from the MAX232
while (mySerial.available()) {
char receivedChar = mySerial.read();
Serial1.print(receivedChar);
}
}
i am using this code.
and output should be like :
AA AA 0C 07 00 00 00 00 00 03 8E 00 55 55
The MEGA2560 has 4 hardware serial ports that would be capable of handling 115200 baud. You would not need to use a software serial port.
You will not get a software serial port to work correctly at 115200 baud unless you have one of the very high speed boards - maybe one of the Teensy variants.
If you must use the Arduino you have (is it an UNO?), then you need to configure your radar sensor for a much lower baud rate - I wouldn't try anything above 19200 baud. If that is not an option, then you need to look for a board with multiple hardware serial ports.
For the Mega2560 try this code
Make sure pin 19 is connected to MAX232 Rout and 18 to the MAX232 Tin
// For Mega2560
// RX_PIN = 19
// TX_PIN = 18
// Connect pin 19 to MAX232 Rout
// Connect pin 18 to MAX232 Tin
void setup() {
Serial.begin(115200); // Serial monitor for debugging
Serial1.begin(115200); // Serial 1 for connecting to the MAX232
// Send the "read radar parameter" instruction
sendReadRadarParameterInstruction();
}
void loop() {
// Check for and print the raw data from the radar
delay(600);
printRawRadarData();
}
void sendReadRadarParameterInstruction() {
// Instruction data packet based on Table 3
byte instructionPacket[] = {
0xAA, 0xAA, // Frame header
0x20, 0x00, // Frame type (low byte first)
0x71, // Instruction of read parameter
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Reserve
0x55, 0x55 // Frame tail
};
// Send the instruction packet to the MAX232
Serial1.write(instructionPacket, sizeof(instructionPacket));
}
void printRawRadarData() {
// Check if data is available from the MAX232
while (Serial1.available()) {
char receivedChar = Serial1.read();
Serial.print(receivedChar);
Serial.print(" ");
}
}
YES i am using max232 module ( RS232 to TTL Serial Interface Module) and all connection is ok according to code . and also i have use Serial.print(receivedChar,HEX) for hex value.
1. Are you using Arduino UNO or Arduino MEGA? 2. Are you using this (Fig12) RS232/TTL Coneverter Module?
Figure-1:
3. Do you have the following TTL/USB Converter Module (Fig-2)? If yes, then you can use the hardware UART Port (UART) of UNO to receive data from radar at Bd = 115200 bits/sec. The modules of Fig-2 would be used to transfer message from UNO to Serial Monitor at Bd = 9600 using software UART Port (SUART). If you don't have this module, then use Arduino MEGA's one of hese three UART Ports: Serial1, Serial2, Serial3.
Figure-2:
1)I am using arduino mega 2560 but i have aslo checked on arduino uno.
2) yes i am using this convertor.
3) when i will use this TTL/USB convertor , have to use 9600 baud rate or 115200?
4) i am also using arduino mega with above code with serial 1 but it`s not responding
