Water pressure struggling with sketch

[mikeg291]

Can some help with this sketch I can't seem to figure it out. I will be so happy when I get past this newbie stage.

#include <SPI.h>
#include <MySensor.h>  
#define BARO_CHILD 0
MySensor gw;
MyMessage pressureMsg(BARO_CHILD, V_PRESSURE);

int pSensor=A0; //assigning pressure sensor to pin A0
int readValue; //declaring our readValue Variable
float Voltage; // declare  voltage variable
float PSI; // declare pressure variable

void setup()
{
  gw.begin();

  // Send the sketch version information to the gateway and Controller
  gw.sendSketchInfo("Water Pressure", "1.1");

  // Register sensors to gw (they will be created as child devices)
  gw.present(BARO_CHILD, S_BARO);


 pinMode(pSensor,INPUT); //declare psensor as a input
 Serial.begin(9600); //start serial port
}

void loop() {
  
  readValue = analogRead(pSensor); // read psensor and put value in read value
  Voltage = (5./1023.)*readValue; //calculating real  world voltage
  PSI = 17.78*Voltage -8; // Calculate pressure PSI

  {
    gw.send (PSI);
  }

Serial.println(PSI); //print results to serial monitor
  delay(1000);   // delay one second

}

[tripy]

What is your error message?
In your loop, this looks wrong:

Voltage = (5./1023.)readValue; 

Are you sure you didn't miss an operator or something ?

You are also missing a presentation of your node, and I don't see anything declaring the radio to be used.
What are you trying to do?

[mikeg291]

he error that I get is
Arduino: 1.6.7 (Windows 7), Board: "Arduino Nano, ATmega328"

C:\Users\repair\Desktop\Ardunio Files\my_pressure_sketch_1\my_pressure_sketch_1.ino: In function 'void loop()':

my_pressure_sketch_1:34: error: no matching function for call to 'MySensor::send(float&)'

 gw.send (PSI);

             ^

C:\Users\repair\Desktop\Ardunio Files\my_pressure_sketch_1\my_pressure_sketch_1.ino:34:17: note: candidate is:

In file included from C:\Users\repair\Desktop\Ardunio Files\my_pressure_sketch_1\my_pressure_sketch_1.ino:2:0:

C:\Program Files (x86)\Arduino\libraries\MySensors/MySensor.h:215:7: note: bool MySensor::send(MyMessage&, bool)

bool send(MyMessage &msg, bool ack=false);

   ^

C:\Program Files (x86)\Arduino\libraries\MySensors/MySensor.h:215:7: note: no known conversion for argument 1 from 'float' to 'MyMessage&'

exit status 1
no matching function for call to 'MySensor::send(float&)'

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.
@tripy

[mfalkvidd]

Change

gw.send(PSI);

to

gw.send(pressureMsg.set(PSI, 0));

[tripy]

I'm a bit blind here, but your issue seems to be that you are trying to send a raw float value, without encapsulating it inside a message.
Looking at the example, in the 1.5 version it is:

gw.send(pressureMsg.set(pressure, 0));

Looking at the 1.5 API (http://www.mysensors.org/download/sensor_api_15#MyMessage), creating the message from a float should be

MyMessage& set(float value, uint8_t decimals);

So, you should not use

gw.send (PSI);

but

//declare and init the message
MyMessage msg(BARO_CHILD, V_PRESSURE);
//set it's content
msg.set(PSI,4); //float value with a 4 numbers after decimal precision
//and send the message
gw.send (msg);

[mikeg291]

@tripy Thanks ; Tripy your solution solve the problem and pointed me in new info . I am slowly learning the solutions are available here .

[tripy]

Glad I was able to help.