@slarti Nice post with great pictures! We seem to have the same blinds in Sweden as well.

@hek The TP4056 is the charger module. I didn't know you meant the fuel gauge. They are two separate boards which I solder together to one part.

@hek They are great and very cheap. Just make sure you get the latest version of the board (the one with the micro-usb). 10pcs for $7 on Ebay.

I found this example file to work much better. The battery drained a lot slower.

  // Interrupt driven binary switch example with dual interrupts
  // Author: Patrick 'Anticimex' Fallberg
  // Connect one button or door/window reed switch between 
  // digitial I/O pin 3 (BUTTON_PIN below) and GND and the other
  // one in similar fashion on digital I/O pin 2.
  // This example is designed to fit Arduino Nano/Pro Mini

  // For lipo gauge
  #include "Arduino.h"
  #include "Wire.h"
  #include "MAX1704.h"

  MAX1704 fuelGauge;
  int oldBatteryPcnt = 0;

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

  #define SKETCH_NAME "Binary Sensor"
  #define SKETCH_MAJOR_VER "1"
  #define SKETCH_MINOR_VER "0"

  #define PRIMARY_CHILD_ID 3
  #define SECONDARY_CHILD_ID 4

  #define PRIMARY_BUTTON_PIN 2   // Arduino Digital I/O pin for button/reed switch
  #define SECONDARY_BUTTON_PIN 3 // Arduino Digital I/O pin for button/reed switch

  #if (PRIMARY_BUTTON_PIN < 2 || PRIMARY_BUTTON_PIN > 3)
  #error PRIMARY_BUTTON_PIN must be either 2 or 3 for interrupts to work
  #endif
  #if (SECONDARY_BUTTON_PIN < 2 || SECONDARY_BUTTON_PIN > 3)
  #error SECONDARY_BUTTON_PIN must be either 2 or 3 for interrupts to work
  #endif
  #if (PRIMARY_BUTTON_PIN == SECONDARY_BUTTON_PIN)
  #error PRIMARY_BUTTON_PIN and BUTTON_PIN2 cannot be the same
  #endif
  #if (PRIMARY_CHILD_ID == SECONDARY_CHILD_ID)
  #error PRIMARY_CHILD_ID and SECONDARY_CHILD_ID cannot be the same
  #endif
   
  MySensor sensor_node;

  // Change to V_LIGHT if you use S_LIGHT in presentation below
  MyMessage msg(PRIMARY_CHILD_ID, V_TRIPPED);
  MyMessage msg2(SECONDARY_CHILD_ID, V_TRIPPED);

  void setup()  
  {  
    sensor_node.begin();

    // Setup the buttons
    pinMode(PRIMARY_BUTTON_PIN, INPUT);
    pinMode(SECONDARY_BUTTON_PIN, INPUT);

    // Activate internal pull-ups
    digitalWrite(PRIMARY_BUTTON_PIN, HIGH);
    digitalWrite(SECONDARY_BUTTON_PIN, HIGH);
    
    // Send the sketch version information to the gateway and Controller
    sensor_node.sendSketchInfo(SKETCH_NAME, SKETCH_MAJOR_VER"."SKETCH_MINOR_VER);

    // Register binary input sensor to sensor_node (they will be created as child devices)
    // You can use S_DOOR, S_MOTION or S_LIGHT here depending on your usage. 
    // If S_LIGHT is used, remember to update variable type you send in. See "msg" above.
    sensor_node.present(PRIMARY_CHILD_ID, S_DOOR);  
    sensor_node.present(SECONDARY_CHILD_ID, S_DOOR);  
  }

  // Loop will iterate on changes on the BUTTON_PINs
  void loop() 
  {
    uint8_t value;
    static uint8_t sentValue=2;
    static uint8_t sentValue2=2;

    // Short delay to allow buttons to properly settle
    sensor_node.sleep(5);
    
    value = digitalRead(PRIMARY_BUTTON_PIN);
    
    if (value != sentValue) {
       // Value has changed from last transmission, send the updated value
       sensor_node.send(msg.set(value==HIGH ? 1 : 0));
       sentValue = value;
    }

    value = digitalRead(SECONDARY_BUTTON_PIN);
    
    if (value != sentValue2) {
       // Value has changed from last transmission, send the updated value
       sensor_node.send(msg2.set(value==HIGH ? 1 : 0));
       sentValue2 = value;
    }
    
    // Fuel gauge
    int batteryPcnt = fuelGauge.stateOfCharge();
    if (oldBatteryPcnt != batteryPcnt) 
    {
       sensor_node.sendBatteryLevel(batteryPcnt);
       oldBatteryPcnt = batteryPcnt;
     }
   
    // Sleep until something happens with the sensor
    sensor_node.sleep(PRIMARY_BUTTON_PIN-2, CHANGE, SECONDARY_BUTTON_PIN-2, CHANGE, 0);
  }

Here's the finished script.

  #include <MySensor.h>
  #include <SPI.h>
  // For lipo gauge
  #include "Arduino.h"
  #include "Wire.h"
  #include "MAX1704.h"

  #define DOOR_ID 3
  #define MAILBOX_ID 2

  #define DOOR_PIN  3  // Arduino Digital I/O pin for button/reed switch
  #define MAILBOX_PIN 2
  //
  MAX1704 fuelGauge;
  int oldBatteryPcnt = 0;
  //
  MySensor gw;
  byte oldValue[2] = { -1, -1};
  //
  unsigned long sleepTime = 86400000UL; // 1 day

  // Change to V_LIGHT if you use S_LIGHT in presentation below
  //MyMessage msg(DOOR_PIN,V_TRIPPED);

  MyMessage msg[2];

  void setup()  
  {  
    // Fuel gauge
    fuelGauge.reset();
    fuelGauge.quickStart();
    fuelGauge.showConfig();
    //
    gw.begin();
    
    // Setup the buttons and Activate internal pull-ups
    pinMode(DOOR_PIN,INPUT_PULLUP);
    pinMode(MAILBOX_PIN, INPUT_PULLUP);

    // Set sensor (pin)
    msg[0].setSensor(DOOR_ID);
    msg[1].setSensor(MAILBOX_ID);

    // Set sensor (type)
    msg[0].setType(V_TRIPPED);
    msg[1].setType(V_TRIPPED);
    
    
    gw.present(DOOR_ID, S_DOOR);
    gw.present(MAILBOX_ID, S_DOOR);
  }
  //
  void loop() 
  {
    // Fuel gauge
    int batteryPcnt = fuelGauge.stateOfCharge();
    if (oldBatteryPcnt != batteryPcnt) 
    {
       gw.sendBatteryLevel(batteryPcnt);
       oldBatteryPcnt = batteryPcnt;
     }
     //
    for (byte i = 0; i < 2; i++)
    {
      debouncer[i].update();
      int value = debouncer[i].read();
      
      //if (value != oldValue[i]);  
      gw.send(msg[i].set(value == HIGH? 1 : 0), false); 
      oldValue[i] = value;
       
    }
    gw.sleep(DOOR_PIN - 2, CHANGE, MAILBOX_PIN - 2, CHANGE, sleepTime);
  }

Tried EasyIoT server @ericvdb? Not my project, but I'm using it now. Simple to set up and use. Just make sure that you use the correct channel for your server and your nodes. Default is set to 95.

http://iot-playground.com/download

@BulldogLowell Thank you! It finally works! I'll make a sketch with comments so other people can use it later for reference.

@BulldogLowell said:

MyMessage msg(0,V_TRIPPED);

So I need to call MyMessage twice. one for each sensor ID? How do I do that without making two instances? That is kind of what I have been trying to do, but I'm having trouble with the syntax.

The problem remains @BulldogLowell . It's like the arduino is treating the two interrupts as one.

The sensors react when trigger them, but it's only N2S1 (door) that shows up in my gateway (EasyIoT), and it always displays the same value (closed). I'm going to go over the wiring and the code again.

Reading one sensor connected to one interrupt is simple... reading two seems impossible

Here's the current state of the sketch:

// Simple binary switch example 
//USING TWO INTERRUPTS
//
#include <MySensor.h>
#include <SPI.h>
#include <Bounce2.h>
// For lipo gauge
#include "Arduino.h"
#include "Wire.h"
#include "MAX1704.h"
//
#define DOOR_PIN  3  // Arduino Digital I/O pin for button/reed switch
#define MAILBOX_PIN 2
//
MAX1704 fuelGauge;
int oldBatteryPcnt = 0;
//
MySensor gw;
Bounce debouncer[2];
byte oldValue[2] = { -1, -1};
//
unsigned long sleepTime = 86400000UL; // 1 day

// Change to V_LIGHT if you use S_LIGHT in presentation below
MyMessage msg(0,V_TRIPPED);
//
void setup()  
{  
  // Fuel gauge
  fuelGauge.reset();
  
  // GW
  gw.begin();
  debouncer[0] = Bounce();
  debouncer[1] = Bounce();
  // Setup the buttons and Activate internal pull-ups
  pinMode(DOOR_PIN,INPUT_PULLUP);
  pinMode(MAILBOX_PIN, INPUT_PULLUP);
  //
  debouncer[0].attach(DOOR_PIN);
  debouncer[1].attach(MAILBOX_PIN);
  debouncer[0].interval(5);
  debouncer[1].interval(5);
  //
  gw.present(DOOR_PIN - 2, S_DOOR);
  delay(250);
  gw.present(MAILBOX_PIN - 2, S_DOOR);
}
//
void loop() 
{
  // Fuel gauge
  int batteryPcnt = fuelGauge.stateOfCharge();
  if (oldBatteryPcnt != batteryPcnt) 
  {
     gw.sendBatteryLevel(batteryPcnt);
     oldBatteryPcnt = batteryPcnt;
   }
   //
  for (byte i = 0; i < 2; i++)
  {
    debouncer[i].update();
    int value = debouncer[i].read();
    if (value != oldValue[i]);
    gw.send(msg.setSensor(i).set(value == HIGH? 1 : 0), false); 
    oldValue[i] = value; 
  }
  gw.sleep(DOOR_PIN - 2, CHANGE, MAILBOX_PIN - 2, CHANGE, sleepTime);
}

Thanks again @BulldogLowell

I think I'm going a bit crazy over this. The problem remains. Only the data for the door is being sent (it only sends closed), but not for the mailbox. Is it because I am defining only the door in the code below?

 MyMessage msg(DOOR_PIN,V_TRIPPED);