Im using an arduino and an hc-06 to communicate with an android. I'm trying to send int values over, but the android says it's receiving empty strings. This is my code:
#include <SoftwareSerial.h>
#define rxPin 11 // define SoftwareSerial rx data pin
#define txPin 10 // define SoftwareSerial tx data pin
#define trigPin 5
#define echoPin 6
SoftwareSerial blueTooth(rxPin, txPin);
void setup() {
Serial.begin (9600);
blueTooth.begin(9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
}
void loop() {
int duration, distance;
digitalWrite(trigPin, LOW); // Added this line
delayMicroseconds(2); // Added this line
digitalWrite(trigPin, HIGH);
delayMicroseconds(10); // Added this line
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29;
Serial.println(distance);
blueTooth.print ((int)(Serial.read()));
delay(200);
}
I think what you want is
blueTooth.print(distance);
First suggestion, try switching the rx and tx pins. I know I've messed that up a bunch. If you didn't know, the rx from the hc-06 should be defined as the tx pin in software serial and visa versa. Michael Yu's comment is definitely preferred to what you originally had. The other thing I can suggest is posting the android code that receives and parses the incoming data.
My string sending function for arduino:
void sendStr(String str){
char b[2];
for(int i = 0; i < str.length(); i++){
String dataSend = str.substring(i,i+1);
dataSend.toCharArray(b,2);
bluetooth.print(b);
delay(1);
}
}
Related
This is the code I wrote:
I set the pins given accordingly I checked my ultrasonic sensors, transistor, and resistors are in working condition. CS (in code denoted as chipset) is pinned in pin 10, resistor to 9, and that resistor is connected to the transistor, and then it is connected to the speaker.
#define trigPin1 3
#define echoPin1 2
#define trigPin2 4
#define echoPin2 5
#define trigPin3 7
#define echoPin3 8
#define cs 10
#include "SD.h"
#include "TMRpcm.h"
#include "SPI.h"
TMRpcm tmrpcm;
long duration, distance, RightSensor, BackSensor, FrontSensor, LeftSensor;
void setup()
{
tmrpcm.speakerPin = 9;
Serial.begin(9600);
if (!SD.begin(cs))
{
Serial.println("SD fail");
}
pinMode(trigPin1, OUTPUT);
pinMode(echoPin1, INPUT);
pinMode(trigPin2, OUTPUT);
pinMode(echoPin2, INPUT);
pinMode(trigPin3, OUTPUT);
pinMode(echoPin3, INPUT);
}
void loop() {
SonarSensor(trigPin1, echoPin1);
RightSensor = distance;
tmrpcm.setVolume(6);
if (RightSensor > 10)
{
tmrpcm.play("RightFormatted.wav");
}
SonarSensor(trigPin2, echoPin2);
LeftSensor = distance;
if (LeftSensor > 10)
{
tmrpcm.play("LeftFormatted.wav");
}
SonarSensor(trigPin3, echoPin3);
FrontSensor = distance;
if (FrontSensor > 10)
{
tmrpcm.play("FrontFormatted.wav");
}
Serial.println(LeftSensor);
Serial.println(" - ");
Serial.print(FrontSensor);
Serial.print(" - ");
Serial.println(RightSensor);
}
void SonarSensor(int trigPin, int echoPin)
{
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration / 2) / 29.1;
}
The error I am getting is:
Error of this code
Instead of typing the name of the .wav file directly inside the .play method, create a const char variable to assign the name(s):
const char* audio1= "RightFormatted.wav";
then you can use it as:#
tmrpcm.play(audio1);
However, based on the examples from the library, you do not need the file extension, but I might be wrong in this regard.
Try first my proposal and please report your results
I have to do a project for Uni using 2 arduino uno, 2 HC 05 bluetooth module and 2 sensors for each arduino. I have set a module to be the slave, and the master connects to the slave only.
When I am trying to send the data from slave to be read by master, it keeps reading 0.
I am using Arduino IDE, I have no errors and everything runs.
This is the code I have so far.
Also, I want to send data from 2 sensors from the slave to the master, but I do not know how to do that.
Slave code
#include <SoftwareSerial.h>
#define TILT 7 // tilt sensor pin
#define LDR 8 //light intensity sensor pin
#define rxPin 10
#define txPin 11
SoftwareSerial nodeCommunication = SoftwareSerial(rxPin, txPin);
int sentBytes; ////// SLAVE CODE
byte data[2];
void setup() {
Serial.begin(9600);
pinMode(rxPin, INPUT);
pinMode(txPin, OUTPUT);
pinMode(TILT, INPUT);
pinMode(LDR, INPUT);
Serial.begin(9600);
nodeCommunication.begin(9600);
delay(2000);
}
void loop() {
//int LDRval = analogRead(LDR); // light intensity sensor (candela)
//int Tilt_Sensed = digitalRead(TILT);
data[0] = analogRead(LDR);
data[1] = digitalRead(TILT);
if(nodeCommunication.available()){
sentBytes = nodeCommunication.write(data[0]);
Serial.println("I reached this if");
}
Serial.println(analogRead(LDR));
Serial.println(sentBytes);
delay(2000);
}
Master Code
#include "dht.h"
#include <SoftwareSerial.h>
#define dht_apin A0 // Analog Pin sensor is connected to A0
dht DHT; // DHT.humidity // DHT.
#define rxPin 10
#define txPin 11
SoftwareSerial nodeCommunication = SoftwareSerial(rxPin, txPin);
byte data = 1;
///// MASTER CODE
void setup(){
Serial.begin(9600);
pinMode(rxPin, INPUT);
pinMode(txPin, OUTPUT);
nodeCommunication.begin(9600);
delay(2000);//Wait before accessing Sensor
}//end "setup()"
void loop(){
//Start of Program
DHT.read11(dht_apin); // reading the data from the sensor
if(nodeCommunication.available()){
data = nodeCommunication.read();
Serial.println("I reached this if");
}
Serial.print(data); Serial.println(" candela;");
Serial.print(DHT.temperature); Serial.println(" C");
Serial.print(DHT.humidity); Serial.println(" % humidity");
delay(2000);//Wait 2 seconds before accessing sensor again.
//Fastest should be once every two seconds.
}// end loop()
Please tell me what I am doing wrong. Thank you so much!
byte data = 1; - should be just byte data;
Have you checked the TX/RX connections? The TX from the master has to connect to the RX of the slave and visa versa. Als GND has to be connected to eachother.
After that, let the master (the transmitter) just Serial.write (in your case nodeCommunication.write() ) to the slave (the receiver).
So something like this:
Master:
#include <SoftwareSerial.h>
#define rxPin 10
#define txPin 11
byte data = 0x01; //Hex value for ''1''
SoftwareSerial nodeCommunication = SoftwareSerial(rxPin, txPin);
void setup()
{
Serial.begin(9600);
pinMode(rxPin, INPUT);
pinMode(txPin, OUTPUT);
nodeCommunication.begin(9600);
}
void loop()
{
nodeCommunication.write(data); //Sends byte data to slave
delay(1000);
}
Slave:
#include <SoftwareSerial.h>
#define rxPin 10
#define txPin 11
byte incoming
SoftwareSerial nodeCommunication = SoftwareSerial(rxPin, txPin);
void setup()
{
Serial.begin(9600);
pinMode(rxPin, INPUT);
pinMode(txPin, OUTPUT);
nodeCommunication.begin(9600);
}
void loop()
{
if(nodeCommunication.available > 0) //Only if data is available
{
byte incoming = nodeCommunication.read(); //read byte from master
Serial.println("Incoming = ");
Serial.println(incoming);
}
else
{
Serial.println("No data available....");
}
}
After your Serial communication is established, implementing the DHT value will be the next step.
I have a ultrasonic sensor (SR04T) that I have connected to my Arduino. I'm using the TX and RX port at the Arduino UNO. The problem is that it only reads value 0 cm. Could anyone help me find the error?
The code I'm using looks like this:
const int trigPin = 1;
const int echoPin = 0;
void setup() {
Serial.begin(9600);
}
void loop()
{
long duration, inches, cm;
pinMode(trigPin, OUTPUT);
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
pinMode(echoPin, INPUT);
duration = pulseIn(echoPin, HIGH);
// convert time into cm
cm = microsecondsToCentimeters(duration);
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);
}
long microsecondsToCentimeters(long microseconds)
{
return microseconds / 29 / 2;
}
You are doing two things incorrectly here.
You are setting pinMode in the Loop. No need for that. Put them in the Setup. You don't need to set pinmode continuously.
You are using pin 0 and 1 for your input and output while using Serial. Serial uses pin 0 and 1 for serial communication. Use other pins for your input and output. Have a look at http://marcusjenkins.com/wp-content/uploads/2014/06/ARDUINO_V2.png
I have an ATTiny85 connected to an NRF24L01+ module using this wiring diagram: diagram. The ATTiny85 periodically goes in and out of sleep to send some value to a receiver, an Arduino Uno. If the ATTiny is running off the Arduino power supply (3.3v), everything works correctly. When I run the ATTiny off of a separate CR2032 coin cell that delivers around 3v, the Arduino never receives any data. I have a status LED hooked up to the ATTiny to ensure that the ATTiny is waking correctly, which it is. Here's the code for both:
EDIT:
Connecting it to an external 3.3v not from the Uno makes everything work - why wouldn't the coin cell's voltage work? I think everything is rated below 2.8v, the CR2032 minimum.
ATTiny Code
#include <avr/sleep.h>
#include <avr/interrupt.h>
// Routines to set and claer bits (used in the sleep code)
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif
#define CE_PIN 3
#define CSN_PIN 3 //Since we are using 3 pin configuration we will use same pin for both CE and CSN
#include "RF24.h"
RF24 radio(CE_PIN, CSN_PIN);
byte address[11] = "SimpleNode";
unsigned long payload = 0;
void setup() {
radio.begin(); // Start up the radio
radio.setAutoAck(1); // Ensure autoACK is enabled
radio.setRetries(15,15); // Max delay between retries & number of retries
radio.openWritingPipe(address); // Write to device address 'SimpleNode'
pinMode(4, OUTPUT);
digitalWrite(4, HIGH);
delay(500);
digitalWrite(4, LOW);
delay(500);
digitalWrite(4, HIGH);
delay(500);
digitalWrite(4, LOW);
delay(500);
digitalWrite(4, HIGH);
delay(500);
digitalWrite(4, LOW);
delay(1000);
setup_watchdog(6);
}
volatile int watchdog_counter = 0;
ISR(WDT_vect) {
watchdog_counter++;
}
void loop()
{
sleep_mode(); //Go to sleep!
if(watchdog_counter >= 5)
{
digitalWrite(4, HIGH);
watchdog_counter = 0;
payload = 123456;
radio.write( &payload, sizeof(unsigned long) ); //Send data to 'Receiver' ever second
delay(1000);
digitalWrite(4, LOW);
}
}
//Sleep ATTiny85
void system_sleep() {
cbi(ADCSRA,ADEN); // switch Analog to Digitalconverter OFF
set_sleep_mode(SLEEP_MODE_PWR_DOWN); // sleep mode is set here
sleep_enable();
sleep_mode(); // System actually sleeps here
sleep_disable(); // System continues execution here when watchdog timed out
sbi(ADCSRA,ADEN); // switch Analog to Digitalconverter ON
}
// 0=16ms, 1=32ms,2=64ms,3=128ms,4=250ms,5=500ms
// 6=1 sec,7=2 sec, 8=4 sec, 9= 8sec
void setup_watchdog(int ii) {
byte bb;
int ww;
if (ii > 9 ) ii=9;
bb=ii & 7;
if (ii > 7) bb|= (1<<5);
bb|= (1<<WDCE);
ww=bb;
MCUSR &= ~(1<<WDRF);
// start timed sequence
WDTCR |= (1<<WDCE) | (1<<WDE);
// set new watchdog timeout value
WDTCR = bb;
WDTCR |= _BV(WDIE);
}
Receiver Code
#define CE_PIN 7
#define CSN_PIN 8
#include <SPI.h>
#include "RF24.h"
RF24 radio(CE_PIN, CSN_PIN);
byte address[11] = "SimpleNode";
unsigned long payload = 0;
void setup() {
while (!Serial);
Serial.begin(115200);
radio.begin(); // Start up the radio
radio.setAutoAck(1); // Ensure autoACK is enabled
radio.setRetries(15,15); // Max delay between retries & number of retries
radio.openReadingPipe(1, address); // Write to device address 'SimpleNode'
radio.startListening();
Serial.println("Did Setup");
}
void loop(void){
if (radio.available()) {
radio.read( &payload, sizeof(unsigned long) );
if(payload != 0){
Serial.print("Got Payload ");
Serial.println(payload);
}
}
}
Is the problem here that the ATTiny and Uno need to be turned on at the same time to establish a connection, or is it something to do with the battery, or something else entirely? Any help would be appreciated.
I'm experiencing the same problem when running Arduino Nano from a battery.
Nano has a 3.3V pin that I'm using for powering the NRF24L01+ module.
When the voltage from my battery-pack drops under 3.3V, the 3.3V pin voltage also drops. After few minutes, the RF module is not sending any messages.
I fixed the problem temporarily by routing the battery through a 12V step-up regulator that I bought earlier for a different project. These 12V then go to the "UN" pin on Nano which accepts 6-20V. This setup works nicely but is definitely not optimal.
Therefore I'm planning to use a 3.3V step-up regulator such as Pololu 3.3V Step-Up Voltage Regulator U1V11F3 which, according to the supplier, can efficiently generate 3.3V from input voltages as low as 0.5V.
I think this might be helpful to your project as well.
I am doing a basic project in Arduino UNO connecting an Ultra Sonic sensor (HC-SR04) which should print in the serial monitor the distance of the closest object but it always print 0.
This is my code:
long distance;
long time;
void setup(){
Serial.begin(9600);
pinMode(4, OUTPUT);
pinMode(2, INPUT);
}
void loop(){
digitalWrite(2,LOW);
delayMicroseconds(5);
digitalWrite(2, HIGH);
delayMicroseconds(10);
time = pulseIn(4, HIGH);
distance = int(0.017*time);
Serial.print("Distance: ");
Serial.print(distance);
Serial.println(" cm.");
delay(1000);
}
And this is the breadboard:
The primary issue that I see is that your code doesn't match your wiring diagram.
For example, your diagram shows Trig connected to pin 4. The Trig should be the output from your Arduino but you have it defined as an input.
The Echo is connected to pin 2 and it should be an input, but you have it defined as an output.
Finally, in your loop(), you are not even using pin 2 or pin 4, but pins 9 and 8. Another issue is the timing you use in setting the trigger pulse - it does not match the datasheet. I would do something like this (assuming that you are actually connected to the pins shown in your diagram):
#define sensorTrigPin 4
#define sensorEchoPin 2
void setup()
{
Serial.begin(9600);
pinMode(sensorTrigPin, OUTPUT);
pinMode(sensorEchoPin, INPUT);
}
void loop()
{
int pulseWidth = 0;
digitalWrite(sensorTrigPin, HIGH);
delayMicroseconds(10);
digitalWrite(sensorTrigPin, LOW);
pulseWidth = pulseIn(sensorEchoPin, HIGH);
Serial.print("Pulse Width: ");
Serial.print(pulseWidth);
delay(1000);
}
Note that pulseWidth is just the amount of time that it takes from the beginning of the Echo pulse going high to the end of the same pulse (when it goes low). You would still have to calculate the distance based on the value of pulseWidth.
UPDATE BASED ON RECENT EDIT TO THE QUESTION
If you change a portion of your loop() code to this, it should work:
void loop(){
digitalWrite(4, HIGH); //was (2, LOW)
delayMicroseconds(10); //was (5)
digitalWrite(4, LOW); //was (2, HIGH)
//REMOVED EXTRA DELAY
time = pulseIn(2, HIGH); //was (4,HIGH);
... //Keep the rest of your code the same.
}
Try connecting your VCC of the sensor to 3V3 instead of 5V. This might sound odd, but I tried it and it worked well. Also, please make sure that your echo and trig pin match the code.