Home Assistant was update quite recently: 11 Apr 2017
https://home-assistant.io/blog/2017/04/08/eddystone-beacons-lockitron-locks-total-connect/#release-0423---april-11

@AffordableTech, regarding PIR sensors, I've got an advice to add 3rd battery since this sensor is very sensible to VCC level and under 3v isn't predictable. So I've connected batteries as suggested here:

I also thought about step-up convertor to power PIR with exactly 3.3v, but I was said this kind of power line is quite noisy which again will cause false positives so Ive rejected this option.

With this setup (3AA) my node became reliable and works that way about 1 week.

As for light sensor, after some thoughts I came into decision to use BH1750FVI sensor which is also I2C one with low consumption if configure it with one time measurement mode (by default it's continuous mode).
My use case is to trigger light by motion only if light level is 0. Now I just send light level alongside with motion event, thus no need of waking up by light interrupt anymore.

Just checked the solution: 9 hours of calm ghostless sleep. :)
At lat I've got solid setup for PIR sensor. It was a headache for me last 6 months, when I tried it with ESP8266

I'd suggest to add capacitors: 47uF for radio and for PIR. Maybe this way power will be more smooth

Thank you guys for quick help! Just bought some batteries to try with.. BTW I saw that this PIR supports 3..5v, so 4.5 is pretty safe.
Will update once got results.

@gohan do you mean take 3 batteries and connect them to PIR thru 3.3v line like mentioned in pic above or thru regulator (regular 5v pin on PIR)? In case of 3.3 line, wouldn't it be risky to apply 4.5v?

@AWI do you think step-up to 3.3 + capacitor would help?

I'm struggling with PIR sensor false positives on my sensor, meanwhile investigation is in progress, but maybe somebody already knows the solution?

Latest investigation showed that PIR sees the motion each ~15min, which is the configured sleep time. So I guess that's somehow connected either to PIR settle time after sleep or some power instability right after waking up.

Here is the part of my log for that node (all skipped except PIR):

17-04-05 06:08:59 DEBUG (Thread-1) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 06:09:41 DEBUG (Thread-5) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

17-04-05 06:26:27 DEBUG (Thread-5) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 06:27:09 DEBUG (Thread-1) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

17-04-05 06:43:55 DEBUG (Thread-5) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 06:44:37 DEBUG (Thread-8) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

17-04-05 07:01:23 DEBUG (Thread-3) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 07:02:05 DEBUG (Thread-6) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

17-04-05 07:18:51 DEBUG (Thread-8) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0
17-04-05 07:18:51 DEBUG (Thread-1) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 07:19:33 DEBUG (Thread-8) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

17-04-05 07:36:19 DEBUG (Thread-6) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 07:37:01 DEBUG (Thread-5) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

17-04-05 07:53:47 DEBUG (Thread-7) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 07:54:29 DEBUG (Thread-8) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

17-04-05 08:11:15 DEBUG (Thread-4) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 08:11:57 DEBUG (Thread-6) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

17-04-05 08:28:43 DEBUG (Thread-9) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 08:29:25 DEBUG (Thread-12) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

17-04-05 08:46:11 DEBUG (Thread-7) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 1
17-04-05 08:46:53 DEBUG (Thread-8) [homeassistant.components.mysensors] temp-hum-light-movement 10 1: value_type 16, value = 0

PIR is HC-SR501, powered with 3.3v thru "H-pad" solution:

Wiring:

Code:

/*
*  Multisensor MySensors node (temperature, humidity, light, motion)
*
*  MCU:
*   - Arduino Mini 3.3v
*
*  Integration type:
*   - MySensors (Radio NRF24)
*
*  MySensors version:
*   2.1.0
*
*  Modules:
*   - nRF24L01: radio
*   - HTU21 / GY-21: temperature/humidity
*   - TBD: light
*   - HC-SR501: motion
*
*   Wiring:
*    Arduino       nRF24L01
*      9  <------>  CE
*     10  <------>  CSN/CS
*     13  <------>  SCK
*     11  <------>  MOSI
*     12  <------>  MISO
*    N/C  <------>  IRQ (not connected)
*
*     Arduino      HTU21
*      A4  <----->  SCL
*      A5  <----->  SDA
*
*     Arduino      Light (TBD)
*
*     Arduino      HC-SR501
*       2  <------> Dout
*
*  Author:
*   Vladimir Dobrikov <hedin.mail@gmail.com>
*/

// Enable debug prints
// #define MY_DEBUG

#define SKETCH_NAME "temp-hum-light-movement"
#define SKETCH_VERSION "1.1"

// Enable and select radio type attached
#define MY_RADIO_NRF24
#define MY_RF24_PA_LEVEL RF24_PA_MIN // RF24_PA_MIN, RF24_PA_LOW, RF24_PA_HIGH, RF24_PA_MAX

//#define MY_NODE_ID 10

// Keep MySensors.h below config definitions
#include <Arduino.h>
#include <MySensors.h>
#include <SparkFunHTU21D.h>

#define THRESHOLD_TEMP 2 // threshold to send update
#define THRESHOLD_HUMD 2 // threshold to send update
const unsigned long INIT_PIR_TIMEOUT_SEC = 5; // 3 sec to init PIR after poweron
const unsigned long SLEEP_TIME_MIN = 15; // Sleep time between reports (in milliseconds)
const byte BATT_WAKEUPS_MAX = 100; // Max wakeup times to send battery status
const byte ENV_WAKEUPS_MAX = 10; // Max wakeup times to send temp/humidity status

// #define DEBUG_OUPUT
#if defined(DEBUG_OUPUT)
  #define DBGPRINT(str) Serial.print(str)
  #define DBGPRINTLN(str) Serial.println(str)
#else
  #define DBGPRINT(str)
  #define DBGPRINTLN(str)
#endif


// Only 2 and 3 generates interrupt!
#define PIN_MOTION 2
#define PIN_LIGHT 3
#define PIN_BATT A0

// Child nodes IDs
#define CHILD_ID_MOTION 1
#define CHILD_ID_LIGHT 2
#define CHILD_ID_TEMP 3
#define CHILD_ID_HUMD 4

// Initialize messages
MyMessage msgMotion(CHILD_ID_MOTION, V_TRIPPED);
MyMessage msgLight(CHILD_ID_LIGHT, V_TRIPPED);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
MyMessage msgHumd(CHILD_ID_HUMD, V_HUM);

HTU21D sensorTempHumd;
int8_t wakeupReason = -42;

// Is there any convenient tool lib for that?
bool prevMotion = false;
bool motion = false;

bool prevLight = false;
bool light = false;

float prevHumd = 0;
float humd = 0;

float prevTemp = 0;
float temp = 0;

int prevBattPcnt = 0;
int battPcnt = 0;

byte battWakeups = 0;
byte envWakeups = 0;

void setup()
{
  analogReference(INTERNAL); // For batt measurement
  pinMode(PIN_MOTION, INPUT);
  pinMode(PIN_LIGHT, INPUT);
  sensorTempHumd.begin();
  sensorTempHumd.setResolution(USER_REGISTER_RESOLUTION_RH10_TEMP13);

  DBGPRINTLN(F("Sleep till PIR init"));
  sleep(INIT_PIR_TIMEOUT_SEC * 1000);
}

void presentation()
{
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo(SKETCH_NAME, SKETCH_VERSION);

  // Register all sensors to gw (they will be created as child devices)
  present(CHILD_ID_MOTION, S_MOTION);
  present(CHILD_ID_LIGHT, S_CUSTOM);
  present(CHILD_ID_TEMP, S_TEMP);
  present(CHILD_ID_HUMD, S_HUM);
}

void loop()
{
  // negative: timeout
  // 0: 1st interrupt
  // 1: 2nd interrupt
  DBGPRINTLN(F("---------------------------"));
  DBGPRINT(F("wakeupReason = "));DBGPRINTLN(wakeupReason < 0 ? "timeout" : wakeupReason == 0 ? "motion" : wakeupReason == 1 ? "light" : "unknown");

  battWakeups = battWakeups >= BATT_WAKEUPS_MAX ? 0 : battWakeups + 1;
  DBGPRINT(F("battWakeups = "));DBGPRINTLN(battWakeups);

  envWakeups = envWakeups >= ENV_WAKEUPS_MAX ? 0 : envWakeups + 1;
  DBGPRINT(F("envWakeups = "));DBGPRINTLN(envWakeups);

  if (battWakeups == 0) {
    battPcnt = getBattPcnt();
    DBGPRINT(F("battPcnt = "));DBGPRINTLN(battPcnt);
  }

  motion = digitalRead(PIN_MOTION) == HIGH;
  DBGPRINT(F("motion = "));DBGPRINTLN(motion);

  light = digitalRead(PIN_LIGHT) == LOW; // Reverse logic
  DBGPRINT(F("light = "));DBGPRINTLN(light);

  if (envWakeups == 0 || wakeupReason < 0) {
    humd = sensorTempHumd.readHumidity();
    DBGPRINT(F("humd = "));DBGPRINTLN(humd);
    humd = roundFloat(humd);

    temp = sensorTempHumd.readTemperature();
    DBGPRINT(F("temp = "));DBGPRINTLN(temp);
    temp = roundFloat(temp);
  }

  // Keep send action in the bottom close to each other to wakeup radio only
  // if needed and have it awake minimum time
  sendDataIfUpdate();

  // Sleep until interrupt comes in on motion or light sensor or sleep timeout.
  DBGPRINT(F("Going to sleep for (min): "));DBGPRINTLN(SLEEP_TIME_MIN);
  wakeupReason = sleep(digitalPinToInterrupt(PIN_MOTION), CHANGE, digitalPinToInterrupt(PIN_LIGHT), CHANGE, SLEEP_TIME_MIN * 60 * 1000);
}

void sendDataIfUpdate() {
  if (prevBattPcnt != battPcnt) {
    prevBattPcnt = battPcnt;
    DBGPRINT(F("  Sending batt: "));DBGPRINTLN(battPcnt);
    sendBatteryLevel(battPcnt);
  }
  if (prevMotion != motion) {
    prevMotion = motion;
    DBGPRINT(F("  Sending motion: "));DBGPRINTLN(motion);

    send(msgMotion.set(motion));
  }
  if (prevLight != light) {
    prevLight = light;
    DBGPRINT(F("  Sending light: "));DBGPRINTLN(light);
    send(msgLight.set(light));
  }
  if (abs(prevHumd - humd) >= THRESHOLD_HUMD) {
    prevHumd = humd;
    DBGPRINT(F("  Sending humd: "));DBGPRINTLN(humd);
    send(msgHumd.set(humd, 1));  // 1 means number of digits of fractional part
  }
  if (abs(prevTemp - temp) >= THRESHOLD_TEMP) {
    prevTemp = temp;
    DBGPRINT(F("  Sending temp: "));DBGPRINTLN(temp);
    send(msgTemp.set(temp, 1));  // 1 means number of digits of fractional part
  }
}

int getBattPcnt() {
  int rawBattVal = analogRead(PIN_BATT);
  DBGPRINT(F("rawBattVal = "));DBGPRINTLN(rawBattVal);

  return rawBattVal / 10;
}

// Round to 0.5
float roundFloat(float val) {
  return round(val * 2) / 2;
}

Thanks in advance!

Can you verify your sketch? Maybe you registered several children with the same ID?

I guess you tested different children config, thus got child ids mixed. IMO it needs to either delete this node in mysensors.json or delete the file itself to force homeassistant to refresh this node with all children.

Made some measurements with current config:
Sending data: 0.54 mA
Sleep (motion on): 0.16 mA
Sleep (motion off): 0.09 mA

Wiring:

Sketch:

/*
*  Multisensor MySensors node (temperature, humidity, light, motion)
*
*  MCU:
*   - Arduino Mini 3.3v
*
*  Integration type:
*   - MySensors (Radio NRF24)
*
*  MySensors version:
*   2.1.0
*
*  Modules:
*   - nRF24L01: radio
*   - HTU21 / GY-21: temperature/humidity
*   - TBD: light
*   - HC-SR501: motion
*
*   Wiring:
*    Arduino       nRF24L01
*      9  <------>  CE
*     10  <------>  CSN/CS
*     13  <------>  SCK
*     11  <------>  MOSI
*     12  <------>  MISO
*    N/C  <------>  IRQ (not connected)
*
*     Arduino      HTU21
*      A4  <----->  SCL
*      A5  <----->  SDA
*
*     Arduino      Light (TBD)
*
*     Arduino      HC-SR501
*       2  <------> Dout
*
*  Author:
*   Vladimir Dobrikov <hedin.mail@gmail.com>
*/

// Enable debug prints
// #define MY_DEBUG

#define SKETCH_NAME "temp-hum-light-movement"
#define SKETCH_VERSION "1.1"

// Enable and select radio type attached
#define MY_RADIO_NRF24
#define MY_RF24_PA_LEVEL RF24_PA_MIN // RF24_PA_MIN, RF24_PA_LOW, RF24_PA_HIGH, RF24_PA_MAX

//#define MY_NODE_ID 10

// Keep MySensors.h below config definitions
#include <Arduino.h>
#include <MySensors.h>
#include <SparkFunHTU21D.h>

#define THRESHOLD_TEMP 2 // threshold to send update
#define THRESHOLD_HUMD 2 // threshold to send update
const unsigned long INIT_PIR_TIMEOUT_SEC = 5; // 3 sec to init PIR after poweron
const unsigned long SLEEP_TIME_MIN = 15; // Sleep time between reports (in milliseconds)
const byte BATT_WAKEUPS_MAX = 100; // Max wakeup times to send battery status
const byte ENV_WAKEUPS_MAX = 10; // Max wakeup times to send temp/humidity status

// #define DEBUG_OUPUT
#if defined(DEBUG_OUPUT)
  #define DBGPRINT(str) Serial.print(str)
  #define DBGPRINTLN(str) Serial.println(str)
#else
  #define DBGPRINT(str)
  #define DBGPRINTLN(str)
#endif


// Only 2 and 3 generates interrupt!
#define PIN_MOTION 2
#define PIN_LIGHT 3
#define PIN_BATT A0

// Child nodes IDs
#define CHILD_ID_MOTION 1
#define CHILD_ID_LIGHT 2
#define CHILD_ID_TEMP 3
#define CHILD_ID_HUMD 4

// Initialize messages
MyMessage msgMotion(CHILD_ID_MOTION, V_TRIPPED);
MyMessage msgLight(CHILD_ID_LIGHT, V_TRIPPED);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
MyMessage msgHumd(CHILD_ID_HUMD, V_HUM);

HTU21D sensorTempHumd;
int8_t wakeupReason = -42;

// Is there any convenient tool lib for that?
bool prevMotion = false;
bool motion = false;

bool prevLight = false;
bool light = false;

float prevHumd = 0;
float humd = 0;

float prevTemp = 0;
float temp = 0;

int prevBattPcnt = 0;
int battPcnt = 0;

byte battWakeups = 0;
byte envWakeups = 0;

void setup()
{
  analogReference(INTERNAL); // For batt measurement
  pinMode(PIN_MOTION, INPUT);
  pinMode(PIN_LIGHT, INPUT);
  sensorTempHumd.begin();
  sensorTempHumd.setResolution(USER_REGISTER_RESOLUTION_RH10_TEMP13);

  DBGPRINTLN(F("Sleep till PIR init"));
  sleep(INIT_PIR_TIMEOUT_SEC * 1000);
}

void presentation()
{
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo(SKETCH_NAME, SKETCH_VERSION);

  // Register all sensors to gw (they will be created as child devices)
  present(CHILD_ID_MOTION, S_MOTION);
  present(CHILD_ID_LIGHT, S_CUSTOM);
  present(CHILD_ID_TEMP, S_TEMP);
  present(CHILD_ID_HUMD, S_HUM);
}

void loop()
{
  // negative: timeout
  // 0: 1st interrupt
  // 1: 2nd interrupt
  DBGPRINTLN(F("---------------------------"));
  DBGPRINT(F("wakeupReason = "));DBGPRINTLN(wakeupReason < 0 ? "timeout" : wakeupReason == 0 ? "motion" : wakeupReason == 1 ? "light" : "unknown");

  battWakeups = battWakeups >= BATT_WAKEUPS_MAX ? 0 : battWakeups + 1;
  DBGPRINT(F("battWakeups = "));DBGPRINTLN(battWakeups);

  envWakeups = envWakeups >= ENV_WAKEUPS_MAX ? 0 : envWakeups + 1;
  DBGPRINT(F("envWakeups = "));DBGPRINTLN(envWakeups);

  if (battWakeups == 0) {
    battPcnt = getBattPcnt();
    DBGPRINT(F("battPcnt = "));DBGPRINTLN(battPcnt);
  }

  motion = digitalRead(PIN_MOTION) == HIGH;
  DBGPRINT(F("motion = "));DBGPRINTLN(motion);

  light = digitalRead(PIN_LIGHT) == LOW; // Reverse logic
  DBGPRINT(F("light = "));DBGPRINTLN(light);

  if (envWakeups == 0 || wakeupReason < 0) {
    humd = sensorTempHumd.readHumidity();
    DBGPRINT(F("humd = "));DBGPRINTLN(humd);
    humd = roundFloat(humd);

    temp = sensorTempHumd.readTemperature();
    DBGPRINT(F("temp = "));DBGPRINTLN(temp);
    temp = roundFloat(temp);
  }

  // Keep send action in the bottom close to each other to wakeup radio only
  // if needed and have it awake minimum time
  sendDataIfUpdate();

  // Sleep until interrupt comes in on motion or light sensor or sleep timeout.
  DBGPRINT(F("Going to sleep for (min): "));DBGPRINTLN(SLEEP_TIME_MIN);
  wakeupReason = sleep(digitalPinToInterrupt(PIN_MOTION), CHANGE, digitalPinToInterrupt(PIN_LIGHT), CHANGE, SLEEP_TIME_MIN * 60 * 1000);
}

void sendDataIfUpdate() {
  if (prevBattPcnt != battPcnt) {
    prevBattPcnt = battPcnt;
    DBGPRINT(F("  Sending batt: "));DBGPRINTLN(battPcnt);
    sendBatteryLevel(battPcnt);
  }
  if (prevMotion != motion) {
    prevMotion = motion;
    DBGPRINT(F("  Sending motion: "));DBGPRINTLN(motion);

    send(msgMotion.set(motion));
  }
  if (prevLight != light) {
    prevLight = light;
    DBGPRINT(F("  Sending light: "));DBGPRINTLN(light);
    send(msgLight.set(light));
  }
  if (abs(prevHumd - humd) >= THRESHOLD_HUMD) {
    prevHumd = humd;
    DBGPRINT(F("  Sending humd: "));DBGPRINTLN(humd);
    send(msgHumd.set(humd, 1));  // 1 means number of digits of fractional part
  }
  if (abs(prevTemp - temp) >= THRESHOLD_TEMP) {
    prevTemp = temp;
    DBGPRINT(F("  Sending temp: "));DBGPRINTLN(temp);
    send(msgTemp.set(temp, 1));  // 1 means number of digits of fractional part
  }
}

int getBattPcnt() {
  int rawBattVal = analogRead(PIN_BATT);
  DBGPRINT(F("rawBattVal = "));DBGPRINTLN(rawBattVal);

  return rawBattVal / 10;
}

// Round to 0.5
float roundFloat(float val) {
  return round(val * 2) / 2;
}

@dbemowsk for the moment I don't use any light sensor (still waiting for delivery). As for PIR, I've connected it a bit unregular way. When I test it with serial connection, it works pretty stable and predictable way even with 3.3v.

Yes, I also just love I2C sensors, thus prefer them against other due to power and pins consumption.
BTW tried to run my test node without light sensor (while waiting for them to be tested) and found results quite frustrated: it appears that PIR sensor generates a lot of false positives (~ each min). For PIR I use HC-SR501 which connected to 3.3v directly like:

Hm, let me try. I just think photoresistor will consume quite a lot of power just by itself. But let me try

I had that problem when use ESP8266 as active WiFi source near PIR sensor..

Thanks for your suggestions! I'll give them a try. At least now I know that's indeed doable

Does anybody know any low power light sensor which can produce pin change interrupt for Arduino?
I planned to use the one with photoresistor:

But it appears to be quite power greedy. There are 2 LEDs onboard: power and threshold. I've made some measurements:
2 LEDs on: 3.7 mA
1 LED on: 2.3 mA
Both LEDs removed: 1.1 mA

That's way too high for battery powered node. What I want to build is the node with movement, light (on/off), temperature and humidity sensors. For the moment this light module is the showstopper for my node.

I also have BH1750FVI GY-302 one which good power budget, but it's not able to produce pin change signal to wake my node up on when light is on or off.
Just ordered APDS-9930 which seems to have INT pin which can be configured to rise by threshold, but maybe somebody know the better solution?