Low power battery Door/Window sketch nrf24l01

[warmaniac]

@LastSamurai

I tryied , many times and changes in sketch but im failed, not waking up on interrupts , im not programmer maybe if I know better C langauge. :( Im using DIGITAL PIN 3 for magnetic sensor input.

[warmaniac]

I don't know if this is correct sketch but now working on interrupts , take a look please

/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
 * repeater and gateway builds a routing tables in EEPROM which keeps track of the
 * network topology allowing messages to be routed to nodes.
 *
 * Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
 * Copyright (C) 2013-2015 Sensnology AB
 * Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
 *
 * Documentation: http://www.mysensors.org
 * Support Forum: http://forum.mysensors.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 *******************************
 *
 * DESCRIPTION
 *
 * Simple binary switch example 
 * Connect button or door/window reed switch between 
 * digitial I/O pin 3 (BUTTON_PIN below) and GND.
 * http://www.mysensors.org/build/binary
 */


// Enable debug prints to serial monitor
#define MY_DEBUG 

// Enable and select radio type attached
#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69

#include <SPI.h>
#include <MySensors.h>
#include <Bounce2.h>

#define CHILD_ID 3
#define BUTTON_PIN  3  // Arduino Digital I/O pin for button/reed switch

Bounce debouncer = Bounce(); 
int oldValue=-1;

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

void setup()  
{  
  // Setup the button
  pinMode(BUTTON_PIN,INPUT);
  // Activate internal pull-up
  digitalWrite(BUTTON_PIN,HIGH);

  // After setting up the button, setup debouncer
  debouncer.attach(BUTTON_PIN);
  debouncer.interval(5);

}

void presentation() {
  // Register binary input sensor to gw (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.
  present(CHILD_ID, S_DOOR);  
}


//  Check if digital input has changed and send in new value
void loop() 
{
  debouncer.update();
  // Get the update value
  int value = debouncer.read();

  if (value != oldValue) {
     // Send in the new value
     send(msg.set(value==HIGH ? 1 : 0));
     oldValue = value;
  }
sleep(digitalPinToInterrupt(BUTTON_PIN)-2, CHANGE, 0);
}```

[mortommy]

Hi,
I have some Door/window sensors, powered by a cr2032 coin battery and I was able to run them for 1 year. The sketch above it seems ok, but the secret it's not only the software, it depends on hardware too:

• remove voltage regulator and led from the arduino
• choose a ceramic decoupling capacitor for your radio module, and avoid electrolytic capacitors (they have a bigger leakage current)
• I don't use any step-up converter, and use the battery to power both the radio module and arduino (reported both to work at 3V)
• a capacitor (again ceramic) of 100uF across the cell’s terminals could sustain a peak current load.

It's also better to avoid messages sending in a short time, and put some sleep in the middle, but I don't see that situation in the sketch.

[warmaniac]

@mortommy

Thanks for you reply !
Apologize me, if I mistaken , but ceramic capacitors in values 100 uF was only SMD? That can't I solder yet. :(

[AWI]

@warmaniac Using debounce with a sleeping node is rather useless. Sleep() halts the millis() timer which is used by debounce. You can just sleep(100) a few ms before entering the interrupt sleep.

[warmaniac]

@AWI

if I understand correctly you mean like this ?

void loop() 
{
  debouncer.update();
  // Get the update value
  int value = debouncer.read();

  if (value != oldValue) {
     // Send in the new value
     send(msg.set(value==HIGH ? 1 : 0));
     oldValue = value;
  }
sleep(200);
sleep(digitalPinToInterrupt(BUTTON_PIN)-2, CHANGE, 0);
}

Wouldn't be delay(200) doing same function ?

[AWI]

@warmaniac delay() does the same thing but does not turn down the power. You can just skip the debouncer stuff.

[Nca78]

@warmaniac said in Low power battery Door/Window sketch nrf24l01:

Apologize me, if I mistaken , but ceramic capacitors in values 100 uF was only SMD? That can't I solder yet. :(

Honestly it's really not a problem to solder those, not long ago (just over a couple of months :) ) I was afraid of SMD soldering and now after only a bit of training it's very easy if you stick to "big" sized SMD components or radios with castellated pins.
But even smaller size gets easy when you learn the right method, I soldered my first SMD atmega328 a few weeks ago and it is running fine :)

[mortommy]

I want also to specify that my sensor was running under library 1.5.4. At the moment I'm experiencing an issue under the library 2.1.1 that makes the sensor continuously wake up, so the battery discharges itself after few hours. Better under library 2.0.0 but the initialization process has many transmissions failure that give to the battery a heavy blow.

[warmaniac]

@mortommy

YES !!! That's it !!! But it is fatal error , because i use step up booster and when battery goes down , It caused that arduino start / shutdown quickly , it spams my Gateway I must disconnect it .