I am working on my senior project for school, and part of what I need to do is use an HM-19 Bluetooth 5.0 module to connect to another Bluetooth 5.0 module and establish a master slave connection.
I can do that just fine, but when I include the code needed for my ultrasonic sensor to do scan, my commands to my HM-19 don't return anything and I can't do any of the basic functions such as finding connections. I have tested it with and without the ultrasonic sensor code and the problem occurs when I use the sensor portion of the code.
TO BE CLEAR, all I am trying to do is just have my Bluetooth 5.0 chip connect to another and do normal commands while also inputting into my serial monitor a distance when I put my hand in front. THIS IS JUST A TEST, once I get that done I will move to what I really want to do.
IT'S JUST A STARTING POINT IN A PROJECT. I have a function call for my sensor and my bluetooth chip in the void loop, that's all that is in there.
I just want to know how to fix this issue. How can I scan with my ultrasonic sensor and send commands to my Bluetooth module? Any help would be greatly appreciated.
[Here are the results when the sensor is commented][1] and [here are the unsuccessful results that results in an infinite loop where I can't get to the portion of the code that returns what the chip says][2]. Lastly, although most of the links include stuff for the HM-10, the commands are basically the same for the HM-19. I'm adding more because stack overflow won't let me edit this post until there are more characters or something. I hope you have a good day/evening person reading this.
Here is my code:
// SerialIn_SerialOut_HM-10_01
//
// Uses hardware serial to talk to the host computer and AltSoftSerial for communication with the bluetooth module
//
// What ever is entered in the serial monitor is sent to the connected device
// Anything received from the connected device is copied to the serial monitor
// Does not send line endings to the HM-10
//
// Pins
// BT VCC to Arduino 5V out.
// BT GND to GND
// Arduino D8 (SS RX) - BT TX no need voltage divider
// Arduino D9 (SS TX) - BT RX through a voltage divider (5v to 3.3v)
//
#include <AltSoftSerial.h>
AltSoftSerial BTserial;
// https://www.pjrc.com/teensy/td_libs_AltSoftSerial.html
char c=' ';
boolean NL = true;
const int trigPin = 9;
const int echoPin = 10;
float duration, distance;
boolean wait_your_turn = false; //My attempt to make sure the sensor and the Bluetooth module don't interfere with each other
//if I'm sending data from the serial monitor to the bluetooth module and vice versa it switches to true and the bluetooth module
//does its thing, so the sensor doesn't get in the way.
void setup()
{
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
Serial.begin(9600);
Serial.print("Sketch: "); Serial.println(__FILE__);
Serial.print("Uploaded: "); Serial.println(__DATE__);
Serial.println(" ");
BTserial.begin(9600);
Serial.println("BTserial started at 9600");
}
void loop()
{
Bluetooth();
Sensor();
}
void Sensor(){
if((wait_your_turn == true))
{}
else
{
Serial.println("Scanning for stuff.");
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration*.0343)/2;
if(distance <= 20)
{
Serial.println(distance);
delay(500);
}
}
}
void Bluetooth()
{
if (Serial.available())
{
if(wait_your_turn == false)
Serial.println("Serial is available");
wait_your_turn = true;
while(Serial.available()>0)
c = Serial.read();
Serial.write(c);
if(c!=10&c!=13)
BTserial.print(c);
}
if (BTserial.available())
{
// Serial.print("We are at the bluetooth portion.");
while(BTserial.available())
c = BTserial.read();
Serial.print(c);
wait_your_turn = false;
}
}
[1]: https://i.stack.imgur.com/Dn4i0.png
[2]: https://i.stack.imgur.com/s9Ifv.png
