My Slim 2AA Battery Node

[ar91]

@arnoldg said:

Is there some one who have lying around several boards, who can share them with me.
i'm from the netherlands, and for now i only need 5 to 6 boards, not 30 :)

so i hope i could take over a couple from someone.

Same here, anybody in US has 4 or 5 boards that i could buy?

[dakky]

Anyone want to share some photos with sensors assembled?
Any experiences how long this node will last? I have one DHT11 and one BH1750 onboard and will wake up the node every 5-15 Minutes.

Greetings
Dakky

[nikos1671]

If I order the 10 pieces for 14$ how many sensor I can build? They mean 10 panels with 3 boards each one?

[kr0815]

yes, that´s 30 sensors you could build then

[GertSanders]

@nikos1671 If you buy the proto pack you could get 9,10 or 11 boards. It could be different that exactly 10 boards. In my case I received 12 boards for my design, in another order I received 11 boards. My last order was 10 boards. But in any case you will be able to make more then 25 sensors. Plenty for a normal house.

[rsachoc]

@dakky said:

Anyone want to share some photos with sensors assembled?
Any experiences how long this node will last? I have one DHT11 and one BH1750 onboard and will wake up the node every 5-15 Minutes.

Greetings
Dakky

I would like this too please! I'm trying to decide on which node to use as a motion sensor and temp/humidity sensor and would like to understand how I add a temp/humidty sensor to these and also the battery drain. And also, what temp/humidity sensors are we able to use with this node? I guess it ouputs max 3v, so does that mean the DHT11 and DHT22 are not able to be used here? Sorry for the newbie questions, I'm beginning to explore my options in relation to building my initial temp/humidity sensor and then a motion sensor.

edit OK, so based on what m26872 said here (http://forum.mysensors.org/topic/2715/slim-node-as-a-mini-2aa-battery-pir-motion-sensor/5) I think that I can only use Si7021 or HTU21 sensors as this outputs around 3v? From reading the spec sheet of the DHT11 and 22 I see they need 3.7v, so I guess if I want to use those sensors I need this node (http://forum.mysensors.org/topic/486/my-2aa-battery-sensor)?

[m26872]

@rsachoc Yep, you got it right.

[dakky]

Arghls no DHT11 with this node? Dammit. But a step up converter should do it?

[m26872]

Humidity Sensor example
http://forum.mysensors.org/topic/3049/slim-node-si7021-sensor-example

(This post used to contain a not yet finished design by mistake. The link above now shows the correct finished project.)

[m26872]

Reed Switch example
With external 10M pull-up to save battery. The plastic foam is used instead of a fixed mount, for easy disassemble, reflash, battery renewal etc.

The Sketch

// EgSlimReed2
// By m26872, 2015-12-22
// Interrupt driven binary switch for Slim Node with Reed switch and external pull-up (10Mohm)
// Inspired by mysensors example:
// https://github.com/mysensors/Arduino/blob/master/libraries/MySensors/examples/BinarySwitchSleepSensor/BinarySwitchSleepSensor.ino

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

#define NODE_ID 5 //12 var senaste "reed-node"-id // 110    // Use static Node_ID  <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
#define SKETCH_NAME "EgSlimReed"
#define SKETCH_VERSION "2.0 2015-12-22"
#define SW_CHILD_ID 5
#define SW_PIN 3
#define BATTERY_REPORT_DAY 2   // Desired heartbeat interval when inactive. Maximum heartbeat/report interval is equal to this due to the dayCounter.
#define BATTERY_REPORT_BY_IRT_CYCLE 10  // Adjust this according to usage frequency.
#define ONE_DAY_SLEEP_TIME 86400000
#define VCC_MIN 1.9
#define VCC_MAX 3.3

int dayCounter = 0;
int irtCounter = 0;
uint8_t value;
uint8_t sentValue=2;
bool interruptReturn=false;
 
Vcc vcc;
MySensor gw;
MyMessage msg(SW_CHILD_ID, V_TRIPPED);

void setup()  
{  
  delay(100); // to settle power for radio
  gw.begin(NULL,NODE_ID);
  pinMode(SW_PIN, INPUT);
  digitalWrite(SW_PIN, LOW);    // Disable internal pull-ups
  gw.sendSketchInfo(SKETCH_NAME, SKETCH_VERSION);
  gw.present(SW_CHILD_ID, S_DOOR);  
}

void loop() 
{
  if (!interruptReturn) { // Woke up by timer (or first run)
	dayCounter++; 
	if (dayCounter >= BATTERY_REPORT_DAY) {
		  dayCounter = 0;
		  sendBatteryReport();
	}
  }
  else {	// Woke up by pin change
	  irtCounter++;
	  gw.sleep(50);  	  // Short delay to allow switch to properly settle
	  value = digitalRead(SW_PIN);
	  if (value != sentValue) {
		 gw.send(msg.set(value==HIGH ? 1 : 0));
		 sentValue = value;
	  }
	  if (irtCounter>=BATTERY_REPORT_BY_IRT_CYCLE) {
		irtCounter=0;
		sendBatteryReport();
	  }
  }

  // Sleep until something happens with the sensor,   or one sleep_time has passed since last awake.
  interruptReturn = gw.sleep(SW_PIN-2, CHANGE, ONE_DAY_SLEEP_TIME);

} 

void sendBatteryReport() {
		  float p = vcc.Read_Perc(VCC_MIN, VCC_MAX, true);
		  int batteryPcnt = static_cast<int>(p);
		  gw.sendBatteryLevel(batteryPcnt);
}

[m26872]

Motion sensor example
As already mentioned; more details to be found here.http://forum.mysensors.org/topic/2715/slim-node-as-a-mini-2aa-battery-pir-motion-sensor

[dakky]

do u add these photos and comments to openhardware.io ? they are quite helpful

[AWI]

@m26872 I don't use any I2C pull-ups. All my Si7021/ SHT21 (GY-21) boards include the SDA/SCL pull-ups (and LDO voltage regulator/ level conversion).

[m26872]

@AWI
Oops, it makes me worried that I completely forgot that this project was in some test stage. Ldo and everything should probably be bypassed, but I wanted to test it first. Post edited. Thanks for noticing!

And sorry for everyone else if this caused any trouble.

(It also makes me a little worried about that I have too many ongoing projects right now. :confounded: )

[rsachoc]

@AWI said:

@m26872 I don't use any I2C pull-ups. All my Si7021/ SHT21 (GY-21) boards include the SDA/SCL pull-ups (and LDO voltage regulator/ level conversion).

@m26872 said:

@AWI
Oops, it makes me worried that I completely forgot that this project was in some test stage. Ldo and everything should probably be bypassed, but I wanted to test it first. Post edited. Thanks for noticing!

And sorry for everyone else if this caused any trouble.

(It also makes me a little worried about that I have too many ongoing projects right now. :confounded: )

Apologies again, so that I understand it, does that mean when adding the mentioned temp sensor nodes I need additional parts?

[m26872]

@rsachoc My mistake and my apology. Unfortunatly I can't even finish and share the resluts from that humidity sensor in a while since I'm leaving for a few weeks holiday.

Anyway
@riataman Shows a mod of the GY-21 board in this post. He also link to a board without the LDO and level converter. In any case you wont need the two 4k7 pull-up in my pictures above, only if use the bare chip.

[ahmedadelhosni]

What about using a hall effect sensor to detect magnet ?

I have a door sensor using the same contact sensor, but I also have a hall effect sensor and I hope to test it soon. It is very small compared to the contact sensor.

[sensorchecker]

Hello m26872,
your project is great, and i will order tomorrow a set of PCBs.
I've done a breadboard setup with the SI7021 according to your schematic and your sketch, which works flawlessly.
(ATmega328P / SI7021 / NRF24L01 / 2xAA Battery / your 1Mhz bootloader / your Fuse Settings)

Unfortunately I do not get the current consumption below 2mA.
What to do to get the power consumption below 10uA and to increase the battery life on a couple of years ?
Any help is appreciated...

[AWI]

@sensorchecker A power consumption of 2mA is way out of range. Is your sensor entering sleep? Or an ftdi adapter still connected?

[arnoldg]

can i run it on 5V without any problem.

For the RF433 interface i need 5V so i would like to make one that is powerd by an usb charger.