Beginner Arduino nano + ultrasonic HC-SRO4

Basically, HC-SRO4 is a radar.

One of the cylinders, the one linked to "Trig", sends out pulses of ultrasounds and the other one, linked to "Echo", listens to their echos. The sensor performs elapsed-time calculation.

If there is an obstacle just above (1), the time between transmission and reception will be short. If the obstacle is farther (2) it will take longer for the echo to reach the listening cylinder. If there is no obstacle (3), there will be no echo.

The Arduino code is supposed to define the length of the pulses and to convert the time (ms) into distance (inches, cm ...). This is done by providing the air-speed at a given temperature as a constant. Depending on what your needs are, this conversion step can be skipped and only raw values may be necessary.

The code you are providing does not correspond to the output screenshot : we should at least see something like Serial.print("sensor") and Serial.print("output") somewhere in the Arduino code, so it is complicated to figure out.

Have you double-checked that Trig and Echo are correctly wired (respectively to 2, output, and 4, input, pins) ?

Several sensors can share the same Trig pin, but must be connected to their own Echo pins.

Hi SÉBASTIEN GAY

I don't think my code is uploading.

I get this error.

Here is a different code i was given by DIY shop is Saigon.

trig to pin 9

echo to pin 10

this code should work fine - I am beginning to understand it.

not printing sensor though

ok. looks like I needed to install Rosetta.

now getting this error when trying to upload code

Try this one (very basic, no conversion & works here):

const int trigPin = 5;
const int echoPin = 6;
long mes=0;

void setup() {
Serial.begin(9600);
pinMode(trigPin, OUTPUT);pinMode(echoPin, INPUT);
digitalWrite(trigPin, LOW);}

void loop() {
measure();
Serial.println(mes);
delay (100);}

void measure(){
digitalWrite(trigPin, LOW);delayMicroseconds(5);
digitalWrite(trigPin, HIGH);delayMicroseconds(10);
digitalWrite(trigPin, LOW);
mes=pulseIn(echoPin, HIGH);}

Trig <=>5 and Echo <=> 6 (you may change at your convenience and update code accordingly).

1. Make sure you select the appropriate board and port before uploading

2. Check Serial Monitor.

3. Fully Close Arduino IDE before trying to get data onto MAX.

Thanks SÉBASTIEN GAY

have to install ATmega328P

to get nano code to upload

https://cycling74.com/forums/58-sensors-hcsr04-from-arduino-to-max-for-installation

you will find all needed infos there

download this lib

https://github.com/gamegine/HCSR04-ultrasonic-sensor-lib

SOURCE AUDIO

thanks.

I saw that thread already.

1 sensor working great now.

should be able to figure multiple sensors on my own

@SOURCE AUDIO

looks I managed to get 2 sensors working using the ultrasonic lib

can't figure out how to unpack in Max

you need to print id , space , then value.

on the link I posted there are examples showing both arduino code and max patch.

this line :

HCSR04 hc(2, new int[8]{3, 4, 5, 6, 7, 8, 9, 10}, 8);

means 8 sensors (bold numbers) and sensor pins in brackets.

2 is trigger pin.

Your line states 6 sensors, but ony pins 5 & 6 ?

take my code from there (modified for you need):

#include <HCSR04.h>

HCSR04 hc(2, new int[8]{3, 4, 5, 6, 7, 8, 9, 10}, 8);

unsigned long Sens[8] = {0,0,0,0,0,0,0,0};

unsigned long exSens[8] = {0,0,0,0,0,0,0,0};

void setup(){Serial.begin(9600);}

void loop(){for (int x = 0; x < 8; x++) {Sens[x] = hc.dist(x);

if (Sens[x] != exSens[x]) Serial.print(x); Serial.print(" ");

Serial.println(Sens[x]); exSens[x] = Sens[x];

}

delay(100);

}

insert correct number of sensors and their pins,

then reduce arrays Sens and exSens size to your number of sensors.

loop for (int x = 0; x < 8; x++) also needs correct value, for example <6 if 6 sensors are in use

in Max you unpack using route

If you need faster readings, you can reduce delay(100);

and maybe increase baud rate in both Arduino and Max.

to 57600 for example

Just post if you need further help.