3. Serial Gateway Sketch with si7021

Serial Gateway Sketch with si7021

  • Markus.

    Hi All,
    I have biuld a Serial Gateway based on RFM69 and a ProMini. Its working great so far. But I want to implement in this Sketch also a Sensor si7021. I have currently no idea how i can implent the sensor part into the Gateway Sketch. Hope someone can help me there.

    Thanks

    Markus

    0
  • gohan
    Mod

    Just add the code of a node in presentation, setup and loop, nothing fancy

    0
  • Markus.

    Well the Problem seems to be in the first step to get a working SI7021 Sketch for MySensors 2.2.0 Beta or 2.1.1.
    I did Try to complie this one now:

    /* Sketch with Si7021 and battery monitoring.
by m26872, 20151109 
*/

#define MY_DEBUG
#define MY_RADIO_NRF24
#define MY_NODE_ID 5             // <<<<<<<<<<<<<<<<<<<<<<<<<<<   Enter Node_ID
#define MY_BAUD_RATE 115200

#include <MySensors.h>  
#include <Wire.h>
#include <SI7021.h>
#include <SPI.h>
#include <RunningAverage.h>

//#define DEBUG

#ifdef DEBUG
#define DEBUG_SERIAL(x) Serial.begin(x)
#define DEBUG_PRINT(x) Serial.print(x)
#define DEBUG_PRINTLN(x) Serial.println(x)
#else
#define DEBUG_SERIAL(x)
#define DEBUG_PRINT(x) 
#define DEBUG_PRINTLN(x) 
#endif

#define CHILD_ID_TEMP 0
#define CHILD_ID_HUM 1
// #define SLEEP_TIME 15000 // 15s for DEBUG
#define SLEEP_TIME 300000   // 5 min
#define FORCE_TRANSMIT_CYCLE 36  // 5min*12=1/hour, 5min*36=1/3hour 
#define BATTERY_REPORT_CYCLE 2880   // Once per 5min   =>   12*24*7 = 2016 (one report/week)
#define VMIN 1900
#define VMAX 3300
#define HUMI_TRANSMIT_THRESHOLD 3.0  // THRESHOLD tells how much the value should have changed since last time it was transmitted.
#define TEMP_TRANSMIT_THRESHOLD 0.5
#define AVERAGES 2

int batteryReportCounter = BATTERY_REPORT_CYCLE - 1;  // to make it report the first time.
int measureCount = 0;
float lastTemperature = -100;
int lastHumidity = -100;

RunningAverage raHum(AVERAGES);
SI7021 humiditySensor;

MyMessage msgTemp(CHILD_ID_TEMP,V_TEMP); // Initialize temperature message
MyMessage msgHum(CHILD_ID_HUM,V_HUM);


void presentation()  
{ 
  sendSketchInfo("EgTmpHumBat5min", "1.0 151106");
  present(CHILD_ID_TEMP, S_TEMP);   // Present sensor to controller
  present(CHILD_ID_HUM, S_HUM);
}


void setup() {
  DEBUG_SERIAL(115200);    // <<<<<<<<<<<<<<<<<<<<<<<<<< Note BAUD_RATE in MySensors.h
  DEBUG_PRINTLN("Serial started");
  
  DEBUG_PRINT("Voltage: ");
  DEBUG_PRINT(readVcc()); 
  DEBUG_PRINTLN(" mV");
/*
  delay(500);
  DEBUG_PRINT("Internal temp: ");
  DEBUG_PRINT(GetInternalTemp()); // Probably not calibrated. Just to print something.
  DEBUG_PRINTLN(" *C");
*/  
  delay(500); // Allow time for radio if power useed as reset
  DEBUG_PRINT("Node and "); DEBUG_PRINTLN("2 children presented.");
  
  raHum.clear();
  
}

void loop() { 

  measureCount ++;
  batteryReportCounter ++;
  bool forceTransmit = false;
  
  if (measureCount > FORCE_TRANSMIT_CYCLE) {
    forceTransmit = true; 
  }
  sendTempHumidityMeasurements(forceTransmit);
/*
  // Read and print internal temp
  float temperature0 = static_cast<float>(static_cast<int>((GetInternalTemp()+0.5) * 10.)) / 10.;
  DEBUG_PRINT("Internal Temp: "); DEBUG_PRINT(temperature0); DEBUG_PRINTLN(" *C");        
*/
  // Check battery
  if (batteryReportCounter >= BATTERY_REPORT_CYCLE) {
    long batteryVolt = readVcc();
    DEBUG_PRINT("Battery voltage: "); DEBUG_PRINT(batteryVolt); DEBUG_PRINTLN(" mV");
    uint8_t batteryPcnt = constrain(map(batteryVolt,VMIN,VMAX,0,100),0,255);   
    DEBUG_PRINT("Battery percent: "); DEBUG_PRINT(batteryPcnt); DEBUG_PRINTLN(" %");
    sendBatteryLevel(batteryPcnt);
    batteryReportCounter = 0;
  }
  
  sleep(SLEEP_TIME);
}

// function for reading Vcc by reading 1.1V reference against AVcc. Based from http://provideyourown.com/2012/secret-arduino-voltmeter-measure-battery-voltage/
// To calibrate reading replace 1125300L with scale_constant = internal1.1Ref * 1023 * 1000, where internal1.1Ref = 1.1 * Vcc1 (per voltmeter) / Vcc2 (per readVcc() function) 
long readVcc() {
  // set the reference to Vcc and the measurement to the internal 1.1V reference
  ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
  delay(2); // Wait for Vref to settle
  ADCSRA |= _BV(ADSC); // Start conversion
  while (bit_is_set(ADCSRA,ADSC)); // measuring
  uint8_t low  = ADCL; // must read ADCL first - it then locks ADCH  
  uint8_t high = ADCH; // unlocks both
  long result = (high<<8) | low;
  result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
  return result; // Vcc in millivolts
}
// function for reading internal temp. From http://playground.arduino.cc/Main/InternalTemperatureSensor 
double GetInternalTemp(void) {  // (Both double and float are 4 byte in most arduino implementation)
  unsigned int wADC;
  double t;
  // The internal temperature has to be used with the internal reference of 1.1V. Channel 8 can not be selected with the analogRead function yet.
  ADMUX = (_BV(REFS1) | _BV(REFS0) | _BV(MUX3));   // Set the internal reference and mux.
  ADCSRA |= _BV(ADEN);  // enable the ADC
  delay(20);            // wait for voltages to become stable.
  ADCSRA |= _BV(ADSC);  // Start the ADC
  while (bit_is_set(ADCSRA,ADSC));   // Detect end-of-conversion
  wADC = ADCW;   // Reading register "ADCW" takes care of how to read ADCL and ADCH.
  t = (wADC - 88.0 ) / 1.0;   // The default offset is 324.31.
  return (t);   // The returned temperature in degrees Celcius.
}

/*********************************************
 * * Sends temperature and humidity from Si7021 sensor
 * Parameters
 * - force : Forces transmission of a value (even if it's the same as previous measurement)
 *********************************************/
void sendTempHumidityMeasurements(bool force) {
  bool tx = force;

  si7021_env data = humiditySensor.getHumidityAndTemperature();
  
  float temperature = data.celsiusHundredths / 100.0;
  DEBUG_PRINT("T: ");DEBUG_PRINTLN(temperature);
  float diffTemp = abs(lastTemperature - temperature);
  DEBUG_PRINT(F("TempDiff :"));DEBUG_PRINTLN(diffTemp);
  if (diffTemp > TEMP_TRANSMIT_THRESHOLD || tx) {
    send(msgTemp.set(temperature,1));
    lastTemperature = temperature;
    measureCount = 0;
    DEBUG_PRINTLN("T sent!");
  }
  
  int humidity = data.humidityPercent;
  DEBUG_PRINT("H: ");DEBUG_PRINTLN(humidity);
  raHum.addValue(humidity);
  humidity = raHum.getAverage();  // MA sample imply reasonable fast sample frequency
  float diffHum = abs(lastHumidity - humidity);  
  DEBUG_PRINT(F("HumDiff  :"));DEBUG_PRINTLN(diffHum); 
  if (diffHum > HUMI_TRANSMIT_THRESHOLD || tx) {
    send(msgHum.set(humidity));
    lastHumidity = humidity;
    measureCount = 0;
    DEBUG_PRINTLN("H sent!");
  }

}

    But I get always follwoing error...

    exit status 1
'si7021_env' has no member named 'humidityPercent'

    So I am a bit lost at the Moment due to my limited coding Knowledge.. 😞

    0 Markus. 1 Reply
  • gohan
    Mod

    Why don't you start with a much simpler sketch? And that is for a node, it is missing all the defines for the gateway. Start with the gateway sketch and add only the code needed by the sensor. The error you get is probably a mismatch between the code and the library: check in the library examples how do you retrive humidity from the sensor

    0
  • Markus.

    Did a mistake with the Libary. Used now the SI7021 from MySensorsArduinoExamples-master and this seems to be okay now

    0
  • Markus.

    the Problem is I cnnaot find any simple Mysensors Sketch to read a SI7021 😞
    Only with battery Monitoring which I don't Need...

    0
  • Markus.

    can it work like this?

    // Enable debug prints to serial monitor
#define MY_DEBUG


// Enable and select radio type attached
#define MY_RADIO_RFM69
#define MY_RFM69_FREQUENCY RFM69_868MHZ

#include <Wire.h>
#include <SI7021.h>
#include <SPI.h>
#include <RunningAverage.h>


#ifdef MY_DEBUG
#define DEBUG_SERIAL(x) Serial.begin(x)
#define DEBUG_PRINT(x) Serial.print(x)
#define DEBUG_PRINTLN(x) Serial.println(x)
#else
#define DEBUG_SERIAL(x)
#define DEBUG_PRINT(x) 
#define DEBUG_PRINTLN(x) 
#endif

#define CHILD_ID_TEMP 0
#define CHILD_ID_HUM 1
// #define SLEEP_TIME 15000 // 15s for DEBUG
#define SLEEP_TIME 300000   // 5 min
#define FORCE_TRANSMIT_CYCLE 36  // 5min*12=1/hour, 5min*36=1/3hour 
#define HUMI_TRANSMIT_THRESHOLD 3.0  // THRESHOLD tells how much the value should have changed since last time it was transmitted.
#define TEMP_TRANSMIT_THRESHOLD 0.5
#define AVERAGES 2

int measureCount = 0;
float lastTemperature = -100;
int lastHumidity = -100;

RunningAverage raHum(AVERAGES);
SI7021 humiditySensor;


// Enable serial gateway
#define MY_GATEWAY_SERIAL

// Define a lower baud rate for Arduino's running on 8 MHz (Arduino Pro Mini 3.3V & SenseBender)
#if F_CPU == 8000000L
#define MY_BAUD_RATE 38400
#endif

// Enable inclusion mode
#define MY_INCLUSION_MODE_FEATURE

// Set inclusion mode duration (in seconds)
#define MY_INCLUSION_MODE_DURATION 60

// Set blinking period
#define MY_DEFAULT_LED_BLINK_PERIOD 300

// Inverses the behavior of leds
//#define MY_WITH_LEDS_BLINKING_INVERSE

// Flash leds on rx/tx/err
// Uncomment to override default HW configurations
//#define MY_DEFAULT_ERR_LED_PIN 4  // Error led pin
//#define MY_DEFAULT_RX_LED_PIN  6  // Receive led pin
//#define MY_DEFAULT_TX_LED_PIN  5  // the PCB, on board LED

#include <MySensors.h>

MyMessage msgTemp(CHILD_ID_TEMP,V_TEMP); // Initialize temperature message
MyMessage msgHum(CHILD_ID_HUM,V_HUM);


void setup()
{
  DEBUG_SERIAL(38400);    // <<<<<<<<<<<<<<<<<<<<<<<<<< Note BAUD_RATE in MySensors.h
  DEBUG_PRINTLN("Serial started");
  delay(500); // Allow time for radio if power useed as reset
  DEBUG_PRINT("Node and "); DEBUG_PRINTLN("2 children presented.");
   raHum.clear();
  
}

void presentation()
{ 
  sendSketchInfo("Gateway_SI7021", "1.0 161017");
  present(CHILD_ID_TEMP, S_TEMP);   // Present sensor to controller
  present(CHILD_ID_HUM, S_HUM);
}


void loop()
{ 

  measureCount ++;
  bool forceTransmit = false;
  
  if (measureCount > FORCE_TRANSMIT_CYCLE) {
    forceTransmit = true; 
  }
  sendTempHumidityMeasurements(forceTransmit);
/*
  // Read and print internal temp
  float temperature0 = static_cast<float>(static_cast<int>((GetInternalTemp()+0.5) * 10.)) / 10.;
  DEBUG_PRINT("Internal Temp: "); DEBUG_PRINT(temperature0); DEBUG_PRINTLN(" *C");        
*/
 
  sleep(SLEEP_TIME);
}

/*********************************************
 * * Sends temperature and humidity from Si7021 sensor
 * Parameters
 * - force : Forces transmission of a value (even if it's the same as previous measurement)
 *********************************************/
void sendTempHumidityMeasurements(bool force) {
  bool tx = force;

  si7021_env data = humiditySensor.getHumidityAndTemperature();
  
  float temperature = data.celsiusHundredths / 100.0;
  DEBUG_PRINT("T: ");DEBUG_PRINTLN(temperature);
  float diffTemp = abs(lastTemperature - temperature);
  DEBUG_PRINT(F("TempDiff :"));DEBUG_PRINTLN(diffTemp);
  if (diffTemp > TEMP_TRANSMIT_THRESHOLD || tx) {
    send(msgTemp.set(temperature,1));
    lastTemperature = temperature;
    measureCount = 0;
    DEBUG_PRINTLN("T sent!");
  }
  
  int humidity = data.humidityPercent;
  DEBUG_PRINT("H: ");DEBUG_PRINTLN(humidity);
  raHum.addValue(humidity);
  humidity = raHum.getAverage();  // MA sample imply reasonable fast sample frequency
  float diffHum = abs(lastHumidity - humidity);  
  DEBUG_PRINT(F("HumDiff  :"));DEBUG_PRINTLN(diffHum); 
  if (diffHum > HUMI_TRANSMIT_THRESHOLD || tx) {
    send(msgHum.set(humidity));
    lastHumidity = humidity;
    measureCount = 0;
    DEBUG_PRINTLN("H sent!");
  }

}
    0
  • gohan
    Mod

    Did you try it?

    0
  • Markus.

    not yet 😉 Will try it later....

    0
  • Markus.

    tried now the Sketch... Seems that something is wrong with the sensor.

     __  __       ____
|  \/  |_   _/ ___|  ___ _ __  ___  ___  _ __ ___
| |\/| | | | \___ \ / _ \ `_ \/ __|/ _ \| `__/ __|
| |  | | |_| |___| |  __/ | | \__ \  _  | |  \__ \
|_|  |_|\__, |____/ \___|_| |_|___/\___/|_|  |___/
        |___/                      2.2.0-beta

0;255;3;0;9;53 MCO:BGN:INIT GW,CP=RRNGA---,VER=2.2.0-beta
0;255;3;0;9;83 TSM:INIT
0;255;3;0;9;92 TSF:WUR:MS=0
0;255;3;0;9;100 TSM:INIT:TSP OK
0;255;3;0;9;108 TSM:INIT:GW MODE
0;255;3;0;9;118 TSM:READY:ID=0,PAR=0,DIS=0
0;255;3;0;9;129 MCO:REG:NOT NEEDED
0;255;3;0;14;Gateway startup complete.
0;255;0;0;18;2.2.0-beta
0;255;3;0;11;Gateway_SI7021
0;255;3;0;12;1.0 161017
0;0;0;0;6;
0;1;0;0;7;
0;255;3;0;9;159 MCO:BGN:STP
Serial started
Node and 2 children presented.
0;255;3;0;9;684 MCO:BGN:INIT OK,TSP=1

    Also the issue with the attached sensor blocks completly the Gateway function.Means that the Gateway didn't receive anything. Is it possible to prevent such issue? what I mean, is it possible to seperate both functions in the Sketch in that way If something is wrong with the sensor, the Gateway can still operate?
    THX
    Markus

    0
  • gohan
    Mod

    add some more serial prints around to see where the code stops

    0 Markus. 1 Reply
  • Markus.

    @gohan how can i do this ? 😞

    0
  • gohan
    Mod

    Look at the "DEBUG_PRINTLN" you have in your code, add some of those where you see there aren't.

    0
  • Markus.

    the Code stops here

    si7021_env data = humiditySensor.getHumidityAndTemperature();

    Anything wrong with the sensor I guess. But how can I handle such things?

    0
  • gohan
    Mod

    did you try an example sketch from the library to see if you can read the values correctly?

    0
  • Markus.

    the sensor conenction was the Problem at the end. Changed SCD and SCL and now it Looks good so far. At the Moment is the Gateway not connected to a Controller. Hope the sensor will be then also send the values...

     __  __       ____
|  \/  |_   _/ ___|  ___ _ __  ___  ___  _ __ ___
| |\/| | | | \___ \ / _ \ `_ \/ __|/ _ \| `__/ __|
| |  | | |_| |___| |  __/ | | \__ \  _  | |  \__ \
|_|  |_|\__, |____/ \___|_| |_|___/\___/|_|  |___/
        |___/                      2.2.0-beta

0;255;3;0;9;53 MCO:BGN:INIT GW,CP=RRNGA---,VER=2.2.0-beta
0;255;3;0;9;83 TSM:INIT
0;255;3;0;9;92 TSF:WUR:MS=0
0;255;3;0;9;100 TSM:INIT:TSP OK
0;255;3;0;9;108 TSM:INIT:GW MODE
0;255;3;0;9;118 TSM:READY:ID=0,PAR=0,DIS=0
0;255;3;0;9;129 MCO:REG:NOT NEEDED
0;255;3;0;14;Gateway startup complete.
0;255;0;0;18;2.2.0-beta
0;255;3;0;11;Gateway_SI7021
0;255;3;0;12;1.0 161017
0;0;0;0;6;
0;1;0;0;7;
0;255;3;0;9;159 MCO:BGN:STP
Serial started
Node and 2 children presented.
0;255;3;0;9;684 MCO:BGN:INIT OK,TSP=1
Loop1 started
T: 21.49
TempDiff :121.49
0;0;1;0;0;21.5
T sent!
H: 64
HumDiff  :164.00
0;1;1;0;1;64
H sent!
Before first sleep
0;255;3;0;9;733 MCO:SLP:MS=300000,SMS=0,I1=255,M1=255,I2=255,M2=255
0;255;3;0;9;768 !MCO:SLP:REP
0;255;3;0;9;124672 TSF:MSG:READ,106-106-0,s=0,c=1,t=1,pt=7,l=5,sg=0:63.3
106;0;1;0;1;63.3
0;255;3;0;9;124702 TSF:MSG:READ,106-106-0,s=255,c=3,t=0,pt=1,l=1,sg=0:90
106;255;3;0;0;90
0;255;3;0;9;124735 TSF:MSG:READ,106-106-0,s=3,c=1,t=38,pt=7,l=5,sg=0:3.71
106;3;1;0;38;3.71
After first sleep
Loop1 started
T: 21.64
TempDiff :0.15
H: 65
HumDiff  :0.00
Before first sleep
0;255;3;0;9;300797 MCO:SLP:MS=300000,SMS=0,I1=255,M1=255,I2=255,M2=255
0;255;3;0;9;300830 !MCO:SLP:REP
0;255;3;0;9;428443 TSF:MSG:READ,106-106-0,s=255,c=3,t=0,pt=1,l=1,sg=0:90
106;255;3;0;0;90
0;255;3;0;9;428476 TSF:MSG:READ,106-106-0,s=3,c=1,t=38,pt=7,l=5,sg=0:3.72
106;3;1;0;38;3.72

    But how can I prevent the Situation that a defect or missing sensor on the Gateway blocks also the Gateway function ?

    Thanks

    Markus

    0
  • gohan
    Mod

    You need to make a check in the code that if the sensor read is fails it should keep going

    0 Markus. 1 Reply
  • Markus.

    @gohan 😉 will try it.... -> Learning leasson... 🙂

    0
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