I have a HC-SR04 Ultrasonic sensor connected to my Arduino Uno. The problem I'm having is when I check the Serial Monitor to see if the sensor is working: it only says "Out of Range" regardless of the distance. I believe I may have the distance calculation wrong because the RedLED stays on and the buzzer doesn't go off.
Here's my .ino code:
#define trigPin 6
#define echoPin 7
#define RedLED 9
#define buzzer 3
int sound = 500;
void setup() {
Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(RedLED, OUTPUT);
pinMode(buzzer, OUTPUT);
}
void loop() {
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/5) / 29.1;
if (distance < 20) {
digitalWrite(RedLED, HIGH);
sound = 1000;
}
else {
digitalWrite(RedLED,LOW);
}
if (distance > 20 || distance <= 0){
Serial.println("Out of range");
noTone(buzzer);
}
else {
Serial.print(distance);
Serial.println(" cm");
tone(buzzer, sound);
}
delay(300);
}
Can't post a comment so I'll post it in Answer.
Check that you have connected VCC to 5v and not to 3.3v.
I think your calculations are ok. Also to exclude calculations just print the duration and see if it changes.
Related
I am reading the output in voltage of a turbidity sensor : https://www.dfrobot.com/product-1394.html?tracking=5b603d54411d5 with an Arduino UNO. I want to print the value of volts outage and its NTU (turbidity units) on an LCD screen ADM1602U Sparkfun.
I cant seem to print the dtata correctly on the lCD, it opens and lights up (so I think the wiring is ok) but no data appear.
Here is the code I am using:
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);
int sensorPin = A0;
int val = 0;
float volt;
float ntu;
void setup()
{
Serial.begin(9600);
lcd.init();
// Turn on the blacklight and print a message.
lcd.backlight();
}
void loop()
{
volt = ((float)analogRead(sensorPin)/1023)*5;
ntu = -1120.4*square(volt)+5742.3*volt-4353.8;
val = analogRead(volt);
Serial.println(volt);
lcd.clear();
lcd.setCursor(0,0);
lcd.print(volt);
lcd.print(" V");
lcd.setCursor(0,1);
lcd.print(ntu);
lcd.print(" NTU");
delay(10);
}
float round_to_dp( float in_value, int decimal_place )
{
float multiplier = powf( 10.0f, decimal_place );
in_value = roundf( in_value * multiplier ) / multiplier;
return in_value;
}
I used an analogread just to see if I was getting correct voltage values for the sensor and I am.
Thanks
Ok so I found the answer, the libary used was not appropriate to print on a 16x2 LCD display. The following code worked FYI:
#include <Wire.h>
#include <SoftwareSerial.h>
// Set the LCD address to 0x27 for a 16 chars and 2 line display
SoftwareSerial LCD(10, 11); // Arduino SS_RX = pin 10 (unused), Arduino SS_TX = pin 11
int sensorPin = A0;
float volt;
float ntu;
void setup()
{
Serial.begin(9600);
LCD.begin(9600); // set up serial port for 9600 baud
delay(500); // wait for display to boot
}
void loop()
{
volt = ((float)analogRead(sensorPin)/1023)*5;
ntu = -1120.4*square(volt)+5742.3*volt-4352.9;
Serial.println(volt);
// move cursor to beginning of first line
LCD.write(254);
LCD.write(128);
// clear display by sending spaces
LCD.write(" ");
LCD.write(" ");
// move cursor to beginning of first line
LCD.write(254);
LCD.write(128);
LCD.print(volt);
LCD.write(" V");
LCD.write(254);
LCD.write(192);
LCD.print(ntu);
LCD.write(" NTU");
delay(1000);
}
I’m trying to send an sms with the location when the ultrasonic sensor measures a certain distance but when I add the gpsSerial(9600) line in the void setup, the ultrasonic sensor readings become inconsistent such as it reads 24 cm then skips to 18 cm then back to 24 cm. i would really appreciate it if anyone familiar with arduino or has faced this problem before would help me out. here is my code:
#include <TinyGPS.h>
#include <SoftwareSerial.h>
#include "NewPing.h"
#define TRIGGER_PIN 7
#define ECHO_PIN 8
#define MAX_DISTANCE 100
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
float duration, distance;
SoftwareSerial gsmSerial(2, 3);
SoftwareSerial gpsSerial(5, 4);
TinyGPS gps; //Creates a new instance of the TinyGPS object
bool newData = false;
void setup()
{
Serial.begin(9600);
gsmSerial.begin(9600);
gpsSerial.begin(9600);
}
void loop()
{
// Send ping, get distance in cm
distance = sonar.ping_cm();
if (distance < 4 )
{
//sendSMS();
Serial.println("Bin is full!!, SMS SENT!!");
Serial.println(distance);
delay(1200);
}
else
{
Serial.println(distance);
delay(2000);
}
delay(2000);
}
void sendSMS(){
// For one second we parse GPS data and report some key values
for (unsigned long start = millis(); millis() - start < 1000;)
{
while (gpsSerial.available())
{
char c = gpsSerial.read();
//Serial.print(c);
if (gps.encode(c))
newData = true;
}
}
if (newData) //If newData is true
{
float flat, flon;
unsigned long age;
gps.f_get_position(&flat, &flon, &age);
gsmSerial.print("AT+CMGF=1\r");
delay(400);
gsmSerial.println("AT + CMGS = \"+26xxxxxxxx\"");// recipient's mobile
number
delay(300);
gsmSerial.print("BIN IS FULL!, PLEASE COLLECT # https://www.google.com
/maps/?q=");
gsmSerial.print(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flat, 6);
gsmSerial.print(",");
gsmSerial.print(flon == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flon, 6);
delay(200);
gsmSerial.println((char)26); // End AT command with a ^Z, ASCII code
26
delay(2000);
gsmSerial.println();
}
}
I've tried to reproduce your problem on Arduino Uno with HC SR04, but with no success – my measurements were stable (more than 100 same measurements in a row). I have even set the sensor to 24 cm distance from the measured obstacle. I used a code derived from what you have provided:
#include <SoftwareSerial.h>
#include "NewPing.h"
#define TRIGGER_PIN 7
#define ECHO_PIN 8
#define MAX_DISTANCE 100
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);
float duration, distance;
SoftwareSerial gsmSerial(2, 3);
SoftwareSerial gpsSerial(5, 4);
void setup() {
Serial.begin(9600);
gsmSerial.begin(9600);
gpsSerial.begin(9600);
}
void loop() {
// Send ping, get distance in cm
distance = sonar.ping_cm();
if (distance < 4 ) {
Serial.println("Bin is full!!, SMS SENT!!");
Serial.println(distance);
}
else {
Serial.println(distance);
}
delay(2000);
}
My conclusion is your code is fine and the problem is HW related. Check the wiring and if possible, try to use another HC-SR04 sensor.
BTW1: During testing, I was sending data to gpsSerial (rx) just to be sure, it is not caused by the GPS module sending some periodic data.
BTW2: How do you power the GPS and GSM module? Are you using Arduino to power these? If yes, this also can be the source of your problems since these modules could drain large peak currents and Arduino as source is not powerful enough ...
I'm currently trying to set up a fermentation specific gravity monitor, using a tilt sensor. The process can take several weeks, and must be contained in a sterile container, so must be battery powerered. I'm using a slightly modified ESP8266-01, which enters sleep mode then wakes once an hour to take a measurement, transmit the data, and return to sleep mode. I'm using an MPU6050 for the tilt sensor. Firstly, I can't seem to put the mpu into sleep mode when the esp is off, it always seems to take around 4mA, and secondly, I only need one axis, is it possible to disable everything else to limit power consumption further? I can't seem to find anything in the manual to disable axis, only to calibrate them. my code is below
experimenting with the registers below seem to make no difference, adding them, taking them out altogether, still takes around 4mA. Tried setting to 1 to put the mpu to sleep at the end of the cycle but makes no difference.
Wire.write(0x6B);
Wire.write(0);
I'm very new to this and im struggling to interpret the manual when it refers to bit6 in addr 6b, how do i set bit 6?
If i could restict the mpu to only 1 axis, no acceleration, and to deep sleep inbetween measurements I should be able to get the power consumption around 0.5mA which gives me agood battery life using a single 18650. Any advice would be greatly appreciated!
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include "MPU6050.h"
#include "I2Cdev.h"
#include "Wire.h"
// Update these with values suitable for your network.
const char* ssid = "****";
const char* password = "******";
IPAddress server(192, 168, 1, 90);
WiFiClient espClient5;
PubSubClient client(espClient5);
long lastMsg = 0;
char msg[50];
const uint8_t scl = 5; //D1
const uint8_t sda = 4; //D2
int val;
int prevVal = 0;
String pubString;
char gravity[50];
MPU6050 mpu;
const int sleepTimeS = 10; //only 10 seconds for testing purposes, set to
1hr when operational
int counter=0;
int16_t ax, ay, az;
int16_t gx, gy, gz;
void setup_wifi() {
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
randomSeed(micros());
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) { //not
required in this application
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
// Create a random client ID
String clientId = "test";
clientId += String(random(0xffff), HEX);
// Attempt to connect
if (client.connect(clientId.c_str())) {
Serial.println("connected");
// Once connected, publish an announcement...
client.publish("AliveRegister", "FermentMon");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
#define ONE_WIRE_BUS 2 // D4 on physical board
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);
float prevTemp = 0;
void setup() {
counter = 0;
Serial.begin(9600);
Wire.begin(0,2);
Wire.write(0x6B); //PWR_MGMT_1 register
Wire.write(0); // set to zero wakes teh 6050
Wire.endTransmission(true);
delay(100);
setup_wifi();
client.setServer(server, 1883);
client.setCallback(callback);
if (!client.connected()) {
reconnect();
}
Serial.println("Initialize MPU");
mpu.initialize();
Serial.println(mpu.testConnection() ? "Connected" : "Connection failed");
float temp;
DS18B20.requestTemperatures();
temp = DS18B20.getTempCByIndex(0); // first temperature sensor
char buff[100];
dtostrf(temp, 0, 2, buff);
temp = temp + 0.5;
int tRound = int(temp);
client.publish("Fermenter/temperature", buff);
Serial.print("Fermenter Temperature: ");
Serial.println(temp);
prevTemp = tRound;
mpu.getMotion6(&ax, &ay, &az, &gx, &gy, &gz);
val = map(ax, -17000, 17000, 0, 180);
pubString = String(val);
pubString.toCharArray(gravity, pubString.length() + 1);
client.publish("Fermenter/angle", gravity);
Serial.print("Gravity angle: ");
Serial.println(val);
delay(500);
// counter = counter+1;
Serial.println("sleep mode");
Wire.write(0x6B); //PWR_MGMT_1 register
Wire.write(1); // set to zero wakes teh 6050
// sleep
ESP.deepSleep(sleepTimeS * 1000000);
delay(2000);
}
void loop() {
client.loop();
}
I'm very new to this and im struggling to interpret the manual when it refers to bit6 in addr 6b, how do i set bit 6?
Setting a bit is simple.
Use the follow functions to avoid any brain storming.
// Write register bit
void writeRegisterBit(uint8_t reg, uint8_t pos, bool state)
{
uint8_t value;
value = readRegister8(reg);
if (state)
{
value |= (1 << pos);
}
else
{
value &= ~(1 << pos);
}
writeRegister8(reg, value);
}
// Write 8-bit to register
void writeRegister8(uint8_t reg, uint8_t value)
{
Wire.beginTransmission(MPU_addr);
#if ARDUINO >= 100
Wire.write(reg);
Wire.write(value);
#else
Wire.send(reg);
Wire.send(value);
#endif
Wire.endTransmission();
}
Example Usage: writeRegisterBit(MPU6050_REG_INT_PIN_CFG, 5, 1); //Register 37;Interrupt Latch Enable
For your application:
void acclSetSleepEnabled(bool state)
{
writeRegisterBit(MPU6050_REG_PWR_MGMT_1, 6, state);
}
If i could restict the mpu to only 1 axis, no acceleration, and to deep sleep inbetween measurements I should be able to get the power consumption around 0.5mA which gives me agood battery life using a single 18650
To enter low power accelerometer mode use the following function:
void lowPowerAccel(uint8_t frequency) {
uint8_t value;
value = readRegister8(MPU6050_REG_PWR_MGMT_2);
value &= 0b00111000;
value |= (frequency << 6) | 0b111;
writeRegister8(MPU6050_REG_PWR_MGMT_2, value);
value = readRegister8(MPU6050_REG_PWR_MGMT_1);
value &= 0b10010111;
value |= 0b00111000;
writeRegister8(MPU6050_REG_PWR_MGMT_1, value);
}
This lowPowerAccel function also puts the gyro to standy mode. The function needs a wake up frequency parameter.
This is defined as follows:
/*
* LP_WAKE_CTRL | Wake-up Frequency
* -------------+------------------
* 0 | 1.25 Hz
* 1 | 2.5 Hz
* 2 | 5 Hz
* 3 | 10 H
*/
#define LP_WAKE_CTRL_1_25 0x00
#define LP_WAKE_CTRL_2_5 0x01
#define LP_WAKE_CTRL_5 0x02
#define LP_WAKE_CTRL_10 0x03
I hope, I could answer some of your questions.
Good luck! :)
Are you using a breakout board for the MPU6050? e.g. GY-521. Often they use linear regulators and leds which will consume additional power. It may be necessary to remove these and run the IMU from a direct power source.
Each register in the MPU6050 is 8 bits wide. When setting an individual bit to a desired value you can either use bitwise manipulation (not practical here as we aren't directly interacting with the registers) or directly set all of the bits in the register to the register's new state e.g. 0b00100000 ~ 0x20. Instead of writing a 1 to 0x6B when attempting to put the MPU6050 to sleep you should be writing 0x20.
https://www.invensense.com/wp-content/uploads/2015/02/MPU-6000-Register-Map1.pdf
Referencing page 40-42, if you want to take things a step further you can disable the temperature sensor, accelerometers, and redundant gyroscope axes to save power while the device is active.
I have just started playing with arduino. I am a little curious as to the delay(1000) method. Below is a very simple project, where i was just trying to print int i at the default loop rate, yet have the led on port 13
int led = 13;
int i =0;
// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
Serial.begin(9600);
Serial.println("Hello");
}
// the loop routine runs over and over again forever:
void loop() {
i++;
Serial.println(i); // wait for a second
blink(1000);
}
void blink(int duration){
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(duration); // wait for a second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
delay(duration);
}
I moved the actual blink code to its own method in hopes that the delay was actually acting like a pause for the method its in, but it slows down my print as well.
Is there a way to have the lights blink at one rate with out effecting the rate of the loop?
So I made this kind of a temperature/humidity sensor and decided to add a fire sensor feature. So it all works fine, right? No, I also decided I want a buzzer to that. Tested it, works well, so I thrown it into my project.
Started it up [project], lit up a lighter, works fine, LEDs blink, a text is shown, buzzer plays an alarm. But then, after the fire was out, the buzzer continued to play one of two tones, even though there was no fire. Here's the code, to make it all clear:
#include <LiquidCrystal.h>
#include <dht.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
dht DHT;
#define FLAME 13
#define DHT11_PIN 8
#define ALARM A5
const int a9 = 9, a10 = 10, a11 = 11, a12 = 12;
byte z[8] = {
B00100,
B00000,
B11111,
B00001,
B00010,
B00100,
B11111,
B00000,
};
byte st[8] = {
0b00110,
0b01001,
0b01001,
0b00110,
0b00000,
0b00000,
0b00000,
0b00000,
};
void setup(){
lcd.begin(16, 2);
lcd.createChar(0, st);
lcd.createChar(1, z);
Serial.begin(9600);
pinMode((a9, a10, a11, a12), OUTPUT);
pinMode(FLAME, INPUT);
pinMode(ALARM, OUTPUT);
}
void loop() {
// Flame sensor code for Robojax.com
int fire = digitalRead(FLAME);// read FLAME sensor
if(fire == HIGH)
{
analogWrite(a9, 255);
analogWrite(a10, 255);
lcd.setCursor(5, 0);
lcd.print("Po");
lcd.print(char(1));
lcd.print("ar!");
tone(ALARM, 4300);
delay(150);
analogWrite(a9, 0);
analogWrite(a10, 0);
lcd.clear();
tone(ALARM, 3500);
delay(150);
} else {
lcd.createChar(0, st);
int chk = DHT.read11(DHT11_PIN);
lcd.home();
lcd.print("Temp.: ");
lcd.print(DHT.temperature);
if(DHT.temperature >= 20.00 && DHT.temperature < 25) {
analogWrite(a11, 255);
delay(750);
analogWrite(a11, 0);
delay(750);
} else if(DHT.temperature >= 25 && DHT.temperature < 30) {
analogWrite(a10, 255);
delay(250);
analogWrite(a10, 0);
delay(250);
} else if(DHT.temperature >= 30) {
analogWrite(a9, 255);
}
lcd.print(char(0));
lcd.print("C");
lcd.setCursor(0, 1);
lcd.print("Wilg.: ");
lcd.print(DHT.humidity);
if(DHT.humidity >= 45.00 && DHT.humidity < 60.00) {
digitalWrite(a12, HIGH);
delay(250);
digitalWrite(a12, LOW);
delay(250);
} else if(DHT.humidity >= 60.00) {
digitalWrite(a12, HIGH);
}
lcd.print(" %");
delay(750);
}
delay(200);
}
So, what I mean is that even though fire is changed from HIGH to LOW and other part of the code is executed, the buzzer continues to play.
What am I doing wrong?
Check the documentation for tone:
A duration can be specified, otherwise the wave continues until a call
to noTone().
So, you probably need to reset your tone on every loop beginning before checking the values of the sensors (or explicitly invoke notone on the LOW branch), or use the 3-arg version of tone.
I have no idea how tone and delay might interact, though.
I'd probably make the actual tone sounding routine its own task. The idea is that you would start the alarm task and then reset it when appropriate. But for now make sure your state is reset at the beginning of every loop, or each branch resets anything it has to explicitly, if tasks sound too advanced.
Make sure you learn the basic "print" debugging in the Arduino world. Simple write logging to the serial port where it can be read on the IDE is invaluable.
Finally: use functions! If you put everything in loop your programs will get unreadable as they grow. For example, if you have some state you want to reset every time (e.g., running tasks like tones, values, flags) then create an init() function that loop calls first so any given loop has good starting state.
Limitations of the Piezo Buzzer
Here are some things to consider when using the piezo buzzer:
You can’t use tone() while also using analogWrite() on pins 3 or 11