Hi,
I am testing the MIT APP Joystick to Arduino by HC 06, few questions need help please.
can I use more variables to read Bluetooth like this：
while (Serial1.available() >= 2) {
x = Serial1.read(); //WAS: xAxis = Serial1.read();
delay(10);
y = Serial1.read(); // WAS: yAxis = Serial1.read();
the serial monitor got just x value.
2. If only one variable can be use, how to separate the 'x' and 'y' data?
3. how to separate the number data and char?
Thanks
Adam
#include <SPI.h>
const int Start_Relay = 37;
const int Stop_Relay = 39;
uint8_t xAxis = 140, yAxis = 140;
uint8_t x = 0;
uint8_t y = 0;
uint8_t command = 0;
char Incoming_value = 0;
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
Serial1.begin(9600); // Default communication rate of the Bluetooth module
SPI.begin();
Serial.println("Setup complete");
Serial.print("File : "), Serial.println(__FILE__);
Serial.print("Date : "), Serial.println(__DATE__);
pinMode(Start_Relay, OUTPUT); //START Relay
pinMode(Stop_Relay, OUTPUT); //STOP Relay
digitalWrite(Start_Relay, LOW);
digitalWrite(Stop_Relay, HIGH);
}
void loop() {
// put your main code here, to run repeatedly:
Bluetooth();
}
void Bluetooth()
{
// Read the incoming data from the Smartphone Android App
while (Serial1.available() >= 2) {
x = Serial1.read(); //WAS: xAxis = Serial1.read();
delay(10);
y = Serial1.read(); // WAS: yAxis = Serial1.read();
xAxis = x;
yAxis = y;
Serial.print("xAxis=");
Serial.println(xAxis);
Serial1.print("yAxis=");
Serial1.println(yAxis);
Incoming_value = Serial1.read();
switch (Incoming_value) {
Serial1.print("Incoming_value!!!!!!!!!!!!!!!!!!=");
Serial1.println(Incoming_value);
case 'S':
Serial.println("START!");
Serial1.println("START!");
digitalWrite(Start_Relay, !digitalRead(Start_Relay)); //
delay(1000); ////MUST HAVE THIS, MILLS() NOT WORK HERE
digitalWrite(Start_Relay, !digitalRead(Start_Relay));
delay(5);
break;
case 'P':
Serial.println("STOP!");
Serial1.println("STOP!");
digitalWrite(Stop_Relay, !digitalRead(Stop_Relay)); //
delay(1000); ////MUST HAVE THIS, MILLS() NOT WORK HERE
digitalWrite(Stop_Relay, !digitalRead(Stop_Relay));
delay(5);
break;
}
}
}
Example code using the example #2 receive with end markers combined with parsing with strtok() to receive the x and y axis values from Bluetooth on Serial1.
const byte numChars = 32;
char receivedChars[numChars]; // an array to store the received data
boolean newData = false;
uint8_t xAxis = 140;
uint8_t yAxis = 140;
void setup()
{
Serial.begin(115200);
Serial1.begin(9600);
Serial.println("<Arduino is ready> Send two numbers separated by commas");
Serial.println("from a Bluetooth app. Like 123,56");
Serial.println("make sure newline is enabled in serial monitor line endings");
}
void loop()
{
recvWithEndMarker();
//showNewData();
if (newData)
{
parseData();
}
}
void recvWithEndMarker()
{
static byte ndx = 0;
char endMarker = '\n';
char rc;
while (Serial1.available() > 0 && newData == false)
{
rc = Serial1.read();
if (rc != endMarker)
{
receivedChars[ndx] = rc;
ndx++;
if (ndx >= numChars)
{
ndx = numChars - 1;
}
}
else
{
receivedChars[ndx] = '\0'; // terminate the string
ndx = 0;
newData = true;
}
}
}
void showNewData()
{
if (newData == true)
{
Serial.print("This just in ... ");
Serial.println(receivedChars);
//newData = false;
}
}
void parseData()
{
char *strings[6]; // an array of pointers to the pieces of the above array after strtok()
char *ptr = NULL; byte index = 0;
ptr = strtok(receivedChars, ","); // delimiters, semicolon
while (ptr != NULL)
{
strings[index] = ptr;
index++;
ptr = strtok(NULL, ",");
}
//Serial.println(index);
/*
// print all the parts
Serial.println("The Pieces separated by strtok()");
for (int n = 0; n < index; n++)
{
Serial.print("piece ");
Serial.print(n);
Serial.print(" = ");
Serial.println(strings[n]);
}
*/
// convert string data to numbers
xAxis = atoi(strings[0]);
yAxis = atoi(strings[1]);
Serial.print("X Axis = ");
Serial.print(xAxis);
Serial.print(" Y Axis = ");
Serial.print(yAxis);
Serial.println();
newData = false;
}
Sorry, I know nothing of the MIT app and have no wish to learn. I use the serial Bluetooth terminal app on my Android tablet for testing.
If I were using an Arduino as the sender I would use:
Serial.print(xAxis); // send x axis value
Serial.print(','); // insert a comma delimiter
Serial.println(yAxis); // send y axis value and '\n' (line feed) terminator
Serial.print(xAxis); // send x axis value
Serial.print(','); // insert a comma delimiter
Serial.print('A');
Serial.print(',');
Serial.println(yAxis); // send y axis value and '\n' (line feed) terminator
How to pick the 'A' out in the receiver side and keep the xAxis/yAxis data Not destroy。
Thanks
A couple of small additions to the parseData function to parse and print the A and the addition of a global variable to hold the A is all it takes. See the **** comments.
const byte numChars = 32;
char receivedChars[numChars]; // an array to store the received data
boolean newData = false;
uint8_t xAxis = 140;
uint8_t yAxis = 140;
char character; // variable for A **** added this
void setup()
{
Serial.begin(115200);
Serial1.begin(9600);
Serial.println("<Arduino is ready> Send two numbers and a character separated by commas");
Serial.println("from a Bluetooth app. Like 123,A,56");
Serial.println("make sure newline is enabled in serial monitor line endings");
}
void loop()
{
recvWithEndMarker();
//showNewData();
if (newData)
{
parseData();
}
}
void recvWithEndMarker()
{
static byte ndx = 0;
char endMarker = '\n';
char rc;
while (Serial1.available() > 0 && newData == false)
{
rc = Serial1.read();
if (rc != endMarker)
{
receivedChars[ndx] = rc;
ndx++;
if (ndx >= numChars)
{
ndx = numChars - 1;
}
}
else
{
receivedChars[ndx] = '\0'; // terminate the string
ndx = 0;
newData = true;
}
}
}
void showNewData()
{
if (newData == true)
{
Serial.print("This just in ... ");
Serial.println(receivedChars);
//newData = false;
}
}
void parseData()
{
char *strings[6]; // an array of pointers to the pieces of the above array after strtok()
char *ptr = NULL; byte index = 0;
ptr = strtok(receivedChars, ","); // delimiters, semicolon
while (ptr != NULL)
{
strings[index] = ptr;
index++;
ptr = strtok(NULL, ",");
}
//Serial.println(index);
/*
// print all the parts
Serial.println("The Pieces separated by strtok()");
for (int n = 0; n < index; n++)
{
Serial.print("piece ");
Serial.print(n);
Serial.print(" = ");
Serial.println(strings[n]);
}
*/
// convert string data to numbers
xAxis = atoi(strings[0]);
character = char(*strings[1]); // get the character **** added this
yAxis = atoi(strings[2]);
Serial.print("X Axis = ");
Serial.print(xAxis);
Serial.print(" Y Axis = ");
Serial.print(yAxis);
Serial.print(" character = "); // **** added this
Serial.print(character); // **** added this
Serial.println();
newData = false;
}
