Help needed on a sketch...

[Bram81]

Hi,

I'm running a serial gateway on a rpi running Domoticz with two moisture sensores connected. Since I want to feed the nodes by batteries I'm trying to only let the nodes send their info a couple of times a day, starting with a two hours interval for now.
The nodes are seen by domoticz and their info is updated after two hours only once, after that no new data is send/received until I've restarted the nodes. Domoticz and the gateway are running fine for the entire time. It seems that the nodes don't wake up after sleeping for two hours for the second time. This is the sketch I use:

Insert Code Here
#include <SPI.h>
#include <MySensor.h>

#define CHILD_ID_LIGHT 0
#define LIGHT_SENSOR_ANALOG_PIN 1
#define BATTERY_SENSE_PIN  A1  // select the input pin for the battery sense point
#define MIN 300  // Liquid
#define MAX 700 // Air

int sensorPin = A0; // select the input pin for the potentiometer
int sensorValue = 0; // variable to store the value coming from the sensor


MySensor gw;
MyMessage msg(CHILD_ID_LIGHT, V_LIGHT_LEVEL);
int lastLightLevel;
int oldBatteryPcnt = 0;
int battLoop =0;

void setup(){

Serial.begin(9600);

gw.begin();

// Send the sketch version information to the gateway and Controller
gw.sendSketchInfo("Mobile2", "1.16");

// Register all sensors to gateway (they will be created as child devices)
gw.present(CHILD_ID_LIGHT, S_LIGHT_LEVEL);
}

void loop(){
// read the value from the sensor:
sensorValue = analogRead(sensorPin);
delay(1000);
int lastsensorValue = sensorValue;
 
Serial.println(sensorValue);
gw.send(msg.set(constrain(map(sensorValue, 1023, 250, 0, 100),0,100)));  
gw.sleep(1800000);
}
 
void check_batt()
{
  // get the battery Voltage
  int batteryValue = analogRead(BATTERY_SENSE_PIN);
  Serial.println(batteryValue);
  
  // 1M, 470K divider across battery and using internal ADC ref of 1.1V
  // Sense point is bypassed with 0.1 uF cap to reduce noise at that point
  // ((1e6+470e3)/470e3)*1.1 = Vmax = 3.44 Volts
  // 3.44/1023 = Volts per bit = 0.003363075
  // vout = (sensorvalue x 3.3) / 1023
  //vin = vout /  (R2/(R1+R2)); 
 
  float batteryV  = ( batteryValue * 0.003225806 ) / 0.3; // divide R2/(R1+R2)
  int batteryPcnt = batteryValue / 10 ;
  if ( batteryPcnt > 100 )
  batteryPcnt = 100;
  
  Serial.print("Battery Voltage: ");
  Serial.print(batteryV);
  Serial.println(" V");
  Serial.print("Battery percent: ");
  Serial.print(batteryPcnt);
  Serial.println(" %");

  if (oldBatteryPcnt != batteryPcnt)
  {
    // Power up radio after sleep
    gw.sendBatteryLevel(batteryPcnt);
    oldBatteryPcnt = batteryPcnt;
  }

}```

I'm still a newbie when it comes to coding, so maybe there is just a obvious error that I just miss?
BTW, the both nodes are fed through USB for now, so I'm sure it's not because of low battery levels. Is there anyone that can help me solve this?

[rvendrame]

Did you try to remove the constrain() and move map() out of the equation?
Like this:

  int sendValue =  map(sensorValue, 1023, 250, 0, 100); 
  gw.send( msg.set( sendValue ) );  

And am I wrong or gw.sleep(1800000) = 20min?

And finally, can you keep the note connected to serial monitor, so you would see the output after 2h (or 20min )?

[Bram81]

@rvendrame Hi! Just changed the code as you suggested. That 1800000 was still from an old test, I'm sure that the sleeptime on the nodes was set for 2 hrs. It's set in miliseconds right? In that case it wasn't 20 but 30 minutes..

For the test I've set it to 600000 - do we agree on this being 10 min..? Since I'm using a Pro Trinket which can only use the serial monitor via FDTI I had to connect a breadbord to get some extra GND pins.. Node are running now.. Knowing more within the next half hour...

[rvendrame]

Right, 1800000 = 30min, sorry.

[Bram81]

@rvendrame Hi, It seems to work now... THANKS! Another question, I'm trying to measure the level of a 9v battery in the same sketch as well, using this:

Insert Code Here
``#include <SPI.h>
#include <MySensor.h>

#define CHILD_ID_LIGHT 0
#define LIGHT_SENSOR_ANALOG_PIN 1
#define BATTERY_SENSE_PIN  A1  // select the input pin for the battery sense point
#define MIN 300  // Liquid
#define MAX 700 // Air

int sensorPin = A0; // select the input pin for the potentiometer
int sensorValue = 0; // variable to store the value coming from the sensor

boolean metric = true;
MySensor gw;
MyMessage msg(CHILD_ID_LIGHT, V_LIGHT_LEVEL);
int lastLightLevel;
int oldBatteryPcnt = 0;
int battLoop =0;

void setup(){

Serial.begin(9600);

gw.begin();

// Send the sketch version information to the gateway and Controller
gw.sendSketchInfo("Mobile1", "1.16");

// Register all sensors to gateway (they will be created as child devices)
gw.present(CHILD_ID_LIGHT, S_LIGHT_LEVEL);

}

void loop(){
// read the value from the sensor:
sensorValue = analogRead(sensorPin);
delay(1000);
int lastsensorValue = sensorValue;
 
Serial.println(sensorValue);
int sendValue =  map(sensorValue, 1023, 250, 0, 100); 
  gw.send( msg.set( sendValue ) );  


  // get the battery Voltage
int batteryValue = analogRead(BATTERY_SENSE_PIN);
  Serial.println(batteryValue);
  
  // 1M, 470K divider across battery and using internal ADC ref of 1.1V
  // Sense point is bypassed with 0.1 uF cap to reduce noise at that point
  // ((1e6+470e3)/470e3)*1.1 = Vmax = 3.44 Volts
  // 3.44/1023 = Volts per bit = 0.003363075
  // vout = (sensorvalue x 3.3) / 1023
  //vin = vout /  (R2/(R1+R2)); 
 
  float batteryV  = ( batteryValue * 0.0088 ) / 0.8; // divide R2/(R1+R2)
  int batteryPcnt = batteryValue / 10 ;
    if ( batteryPcnt > 100 )
  batteryPcnt = 100;
  
  Serial.print("Battery Voltage: ");
  Serial.print(batteryV);
  Serial.println(" V");
  Serial.print("Battery percent: ");
  Serial.print(batteryPcnt);
  Serial.println(" %");

  if (oldBatteryPcnt != batteryPcnt)
  {
    // Power up radio after sleep
    gw.sendBatteryLevel(batteryPcnt);
    oldBatteryPcnt = batteryPcnt;
gw.sleep(300000);
  }

Using this sketch causes the battery check into some kind of loop and not sending it back correctly to domoticz. Log shows:
Battery Voltage: 1.68 V
Battery percent: 15 %
384
send: 1-1-0-0 s=0,c=1,t=23,pt=2,l=2,st=ok:82
153
Battery Voltage: 1.68 V
Battery percent: 15 %
385
send: 1-1-0-0 s=0,c=1,t=23,pt=2,l=2,st=ok:82
153
Battery Voltage: 1.68 V
Battery percent: 15 %
384

Any ideas on this?

[rvendrame]

Just put the gw.sleep out of the if {}

[Bram81]

Ok, I'm almost where I want to be... Feeding my pro tinket 5v on a 9v battery I've managed to get the correct voltage reading. Which is aprox 9.10v on a new battery. The only thing I can't get to work is the % which I need to send to Domoticz .

I'm using this code, being pretty sure that the formula is correct but whatever I try, the battery % is shown as 0 on every voltage level. Am I missing something... ?

// number of analog samples to take per reading
#define NUM_SAMPLES 10

int sum = 0;                    // sum of samples taken
unsigned char sample_count = 0; // current sample number
float voltage = 0.0;            // calculated voltage

#include <SPI.h>
#include <MySensor.h>

#define CHILD_ID_LIGHT 0
#define LIGHT_SENSOR_ANALOG_PIN 1
#define BATTERY_SENSE_PIN  A1  // select the input pin for the battery sense point
#define MIN 300  // Liquid
#define MAX 700 // Air
// number of analog samples to take per reading
#define NUM_SAMPLES 10


int sensorPin = A0; // select the input pin for the potentiometer
int sensorValue = 0; // variable to store the value coming from the sensor


MySensor gw;
MyMessage msg(CHILD_ID_LIGHT, V_LIGHT_LEVEL);

void setup(){

Serial.begin(9600);

gw.begin();

// Send the sketch version information to the gateway and Controller
gw.sendSketchInfo("Mobile1", "1.16");

// Register all sensors to gateway (they will be created as child devices)
gw.present(CHILD_ID_LIGHT, S_LIGHT_LEVEL);

}

void loop(){
// read the value from the sensor:
sensorValue = analogRead(sensorPin);
delay(1000);
int lastsensorValue = sensorValue;
 
Serial.println(sensorValue);
int sendValue =  map(sensorValue, 1023, 250, 0, 100); 
  gw.send( msg.set( sendValue ) );  
  gw.sleep(3000);


 // take a number of analog samples and add them up
    while (sample_count < NUM_SAMPLES) {
        sum += analogRead(A1);
        sample_count++;
        delay(10);
    }
    // calculate the voltage
    // use 5.0 for a 5.0V ADC reference voltage
    // 5.015V is the calibrated reference voltage
    voltage = ((float)sum / (float)NUM_SAMPLES * 4.92) / 1024.0;
    int Vmax = 9.10;
int Vmin =4.92;
int spanning = voltage * 11.714;
   int batteryPcnt = ((spanning-Vmin)/(Vmax-Vmin))*100;
   
      if ( batteryPcnt > 100 )
  batteryPcnt = 100;
    // send voltage for display on Serial Monitor
    // voltage multiplied by 11 when using voltage divider that
    // divides by 11. 11.132 is the calibrated voltage divide
    // value
    Serial.print(voltage * 11.714);
    Serial.println (" V");
    
    sample_count = 0;
    sum = 0;
  Serial.print("Battery percent: ");
  Serial.print(batteryPcnt);
  Serial.println(" %");
      

  }

[Bram81]

Oh and I mean shown as 0% in the serial monitor since I haven't put in the gw.send command in yet..

[rvendrame]

Did you try to define batteryPcnt as 'float' instead 'int'?

[Bram81]

define batteryPcn as float didn't make a difference, but after that I did:

float spanning = voltage * 11.714;
float batteryPcnt = ((spanning-Vmin)/(Vmax-Vmin))*100;

It seems to be working now! Thanks a million again..

[Bram81]

Do i have to use a different command to send the battterypcnt to the gateway?

gw.send(batteryPcnt);

gives this error:

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

[rvendrame]

it means gw.send() only accepts a integer --- So you need to set batteryPcnt back to int.

[Bram81]

When i set batteryPcnt back to int it shows: no matching function for call to 'MySensor::send(int&)'

[rvendrame]

I use this:

// Report battery level to controller 
gw.sendBatteryLevel( bat_level );

[Bram81]

Working like a charm now! Thank you very much for your help!!

[Bram81]

Hi there,

I'm having another sketch problem.. In order to try and save battery power on my moisture sensors I'm trying to use a IO pin as power by setting it high for some time, let the sensor take a measurement, send the results to the gateway, setting the IO pin low again, let the node go to sleep for some time .

This works only one time, the node presents itself to the gateway, sends data but after that it's not seen again after the expected sleep time.
My guess is that somehow after puting the IO pin low it doesn't come back up in a high state. The strange thing is that when I measure the current on the pins of my moisture sensor with a multimeter the current goes from 0 to aprox 4.27V in the given time, so actually that indicates the pin is going from high to low as needed, but somehow the radio doesn't come back up... This is my code:

#include <SPI.h>
#include <MySensor.h>

#define CHILD_ID_LIGHT 0
#define LIGHT_SENSOR_ANALOG_PIN 1
#define MIN 300  // Liquid
#define MAX 700 // Air

int sensorPin = A0; // select the input pin for the potentiometer
int sensorValue = 0; // variable to store the value coming from the sensor
int power =4;
MySensor gw;
MyMessage msg(CHILD_ID_LIGHT, V_HUM);
int lastLightLevel;



void setup(){
pinMode(power, OUTPUT);
digitalWrite(power, HIGH);
delay(3000);
Serial.begin(9600);

gw.begin();

// Send the sketch version information to the gateway and Controller
gw.sendSketchInfo("Mobile Sensor 1", "Kruiden");

// Register all sensors to gateway (they will be created as child devices)
gw.present(CHILD_ID_LIGHT, S_HUM);

delay (2000);
}
void loop(){
// read the value from the sensor:


digitalWrite(power, HIGH);
delay (5000);
sensorValue = analogRead(sensorPin);
delay(1000);
int lastsensorValue = sensorValue;
 
Serial.println(sensorValue);
int sendValue =  map(sensorValue, 0, 842, 0, 100); 
  gw.send( msg.set( sendValue ) );
 delay(10000); 
digitalWrite(power, LOW);
delay (2000);
gw.sleep(60000);
}
 

Does anyone have any clue..?