How to Mysensors.

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The mysensors gateway (arduino nano with NRF) works like the the homeduino arduino nano.

You can program the mysensors gateway on your computer.

Just a little question sweeBee. I have running on the pi a homeduino with a 433mhz transmitter for the kaku stuff. Now I liked the mysensors stuff and I was checking there and it showed me a nice transmitter But that is 2.5ghz.

The question is can I build a gateway for mysensors and connect it to my pi next to my homeduino?

Thnx

Yes, that’s possible, you can use another arduino nano where you flash the my sensors gw on and connect it to your pi

Thank you. Now I have a lot of work to do 😁

I have made a lot of sensors. For beginners and people that already have made some sensors will find out that its annoying to attach the radio cables (quite a lot). So I ordered some:

NRF24L01+ smd 1.27mm (mini)
NRF > arduino pro mini shield

Haven’t received them yet, but this makes soldering sensors much faster and easier Just wanted to share

example:

@sweebee
very nice! what do these shields cost?

@leader21 2.25 dollar per 3pcs. free shipping.

I’ve ordered 12 of them
And a few of those nrf modules, now I can compact my sensors even more!

@sweebee : I don’t understand. When I look for example at this set, It comes with antenna’s (the gold zig-zag) at one end.
What do you mean with “radio cables”? Are you talking about the antenna(s) or something else?
And why would I chose the “NRF24L01+ smd (mini)” you are referring to? Are they better?

@Harry-van-der-Wolf the shields i ordered have place for the nrf smd versions, they are much smaller than the default nrfs. This shield can be soldered directly on the pro mini. Normally you have to solder all the wires from the nrf to the pro mini. Soldering one is fine, but soldering like 10 nrfs is killing. And with those shields and smd nrfs it’s much smaller.

@leader21 i found out that I ordered the wrong nrfs. I placed a link of the 1.7mm version. There is even a smaller version that the shield needs (1.27mm).

OK. Now I understand. I had not recognised the pro mini in the image you shared. I thought it was another “something”

Shields arrived. Now waiting for the nrfs.

@sweebee
thx for the info! i ordered some of the shields and nrf. now let’s see if i can finally make the step into the mysensor world

@sweebee Nice!
What is the type of the PIR on the photo? And where can these be ordered?

that’s a standard HC-SR501 as it seems.
If using this on 3V you will have to do some adaptions.
you can have a look here http://forum.mysensors.org/topic/225/hc-sr501-motion-sensor/25
or maybe @sweebee gives a short description on how he built it?

Its a normal HC-SR501. I just modified it so it could fit in my case and it works on <3V

I removed all the headers and rewired the left capacitor (removed the capacitor and put wires between it) so it fits tightly in my case.

In my bookmarks I have this connection. I have not tested this.
PIR Motion Sensor on 3.3v

Radio’s have arrived:

@sweebee

looks really nice and compact, good work soldering soldier

did you use the same code as here on your arduino?? could you say something about your battery lifetime?

I’m using the same code like motionsensor to get the soil 0/1 of my plant every hour.

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

#define CHILD_ID 4
#define BUTTON_PIN  8  // Arduino Digital I/O pin for button/reed switch

MySensor gw;
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()  
{  
  gw.begin();

 // Setup the button
  pinMode(BUTTON_PIN,INPUT);
  pinMode(6, OUTPUT); // Power Pin for A/D Module
  // Activate internal pull-up
  digitalWrite(BUTTON_PIN,LOW);
  
  // After setting up the button, setup debouncer
  debouncer.attach(BUTTON_PIN);
  debouncer.interval(5);
  
  // 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.
  gw.present(CHILD_ID, S_DOOR);  
}


//  Check if digital input has changed and send in new value
void loop() 
{
  digitalWrite(6, HIGH); // Power on YL-38 A/D Module
  delay(2000);
  debouncer.update();
  // Get the update value
  int value = debouncer.read();
 
  if (value != oldValue) {
     // Send in the new value
     gw.send(msg.set(value==LOW ? 1 : 0));
     oldValue = value;
  }
  delay(2000);
  digitalWrite(6, LOW); // Power off YL-38 A/D Module
  delay(3600000); // wait a hour, then reloop
} 

If i dont care about the power of the soil-sensor-module the contacts corrode in a few days.
Maybe someone have a battery-friendlier solution… with delay(3600000) maybe its not the best solution for powering with batteries.

@xCite86 theoretically they should run for around 450 days. I’m using my own sketch.

It measures the battery life (uses readVcc).
Resends if a message fails, thanks to @n3ro.
Does also send a false signal.

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

// ********** CONFIG **********************************

    #define NODE_ID AUTO          // ID of node
    #define CHILD_ID 1            // ID of sensor
    #define PIR_PIN 3             // Pin connected to the PIR
    
    #define MIN_V 2000            // empty voltage (0%)
    #define MAX_V 3200            // full voltage (100%)

// ****************************************************

MyMessage msg(CHILD_ID, V_TRIPPED);
MySensor node;

int oldBatteryPcnt;
int sentValue;
int forceSend = 0;

void setup()
{
  node.begin(NULL, NODE_ID, false);
  node.sendSketchInfo("PIR Sensor", "1.2");
  node.present(CHILD_ID, S_MOTION);
  pinMode(PIR_PIN, INPUT);
  digitalWrite(PIR_PIN, HIGH);
}

void loop()
{
  
  // Get PIR
  int value = digitalRead(PIR_PIN); // Get value of PIR
  if (value != sentValue) { // If status of PIR has changed
    resend(msg.set(value), 5); // Send PIR status to gateway
    sentValue = value;
  }

  // Send batterylevel
  sendBattery(); 

  // Sleep until something happens with the sensor
  node.sleep(PIR_PIN-2, CHANGE); 
}

// FUNCTIONS

void sendBattery() // Send battery percentage to GW
{
  forceSend++;
  int batteryPcnt = min(map(readVcc(), MIN_V, MAX_V, 0, 100), 100); // Get VCC and convert to percentage      
  if (batteryPcnt != oldBatteryPcnt || forceSend >= 20) { // If battery percentage has changed
    node.sendBatteryLevel(batteryPcnt); // Send battery percentage to gateway
    oldBatteryPcnt = batteryPcnt; 
    forceSend = 0;
  }
}

void resend(MyMessage &msg, int repeats) // Resend messages if not received by GW
{
  int repeat = 0;
  int repeatDelay = 0;
  boolean ack = false;

  while ((ack == false) and (repeat < repeats)) {
    if (node.send(msg)) {
      ack = true;
    } else {
      ack = false;
      repeatDelay += 100;
    } 
    repeat++;
    delay(repeatDelay);
  }
}

For your sketch, replace delay(3600000)) with sleep(3600000)