💬 Door, Window and Push-button Sensor

[gohan]

The send function returns a value, so you can check if it was successfully sent or not and in case retry

[alowhum]

A quick ACK example:

        static boolean tryAgainLater = false; // should we resend?

        if(send(msgDust.setSensor(CHILD_ID_DUST_PM25).set(sensorValue),1)){
          Serial.println(F("Received ACK"));
          tryAgainLater = false;
        }else {
          Serial.println(F("Connection problem, try again"));
          tryAgainLater = true;
        }

[mfalkvidd]

There is no need to set the second parameter to send() to true. That parameter is unrelated to the return value (except very unfortunate similar naming). More info: https://github.com/mysensors/MySensors/issues/1103

[alowhum]

@mfalkvidd said in 💬 Door, Window and Push-button Sensor:

https://github.com/mysensors/MySensors/issues/1103

Ah, thanks. So ACK basically always happens?

in that case, do you have any better example code on how to check if the ACK is received?

[mfalkvidd]

@alowhum on nrf24, "hardware" ack is always on. "Software" ack is controlled by the second parameter in the send() function. Read https://forum.mysensors.org/post/34267 for an attempt to sort out the details. It is still quite confusing for me.

[tiana]

What will happen if i cut the power OFF of the radio after each transmission? is it needed to be initialize again before next transmission?

[mfalkvidd]

@tiana yes.

But don't cut the power. Use transportDisable and transportReInitialize instead.

[tiana]

Do you know how much will be power usage in transportDisable mode?

[mfalkvidd]

@tiana depends on which transport you are using, and if using genuine or clone chips. The nrf24 is rated for 900nA.

[tiana]

Thanks for fast reply, actually 900nA is to big number and i prefer to use xxx_POWER_PIN to cut the power of the NRF module.
I am building switch powered with CR2032 battery and i want to extend battery live as much as possible, for a switch is not needed to keep radio alive, i need it ON only when transmit signal

[mfalkvidd]

@tiana 900nA on a cr2032 is 27.9 years battery life. The self discharge of a cr2032 is around 250nA.
But yes, use the power pin setting if you want to.

Would be interesting to see how long sleep times are needed to make up for the extra time needed to wake up the radio from power off compared to sleep. The mcu and the radio will need to be awake for 100ms longer time when starting from power off than when starting from sleep.

[Terence Faul]

Hi I notice that there is not sleep in this sketch. Is it not required for this build

[mfalkvidd]

@terence-faul the sketch will work as-is, as long as the node has a constant power supply. If you want a battery-powered node, you'll need sleep. See earlier discussions in this thread for ways to add sleep.

[pepson]

Hi
Can i connect two sensor contact to this arduino ? First to pin 3 second to pin 4 ? But how modified this sketch to support two sensor contact ?

[skywatch]

@pepson If you need the node to sleep or want to use interrupts then only digital pins 2 and 3 will do this for uno/promini.

So otherwise 2 options really.

If you just need to know that one of the sensors triggered (but not which one) then you can add sensors in series (for normally 'closed' sensors) or parallel (for normally 'open' sensors).

To use interrupt and know which sensor triggered you'd have to connect both sensor to interrupt pin with blocking diodes to digital pins as well and then on interrupt you can check which digital pin activated the isr.

[pepson]

I need connect two contact sensor. And i want to know from two sensor his status...
I need use one to door but second to door garage.

[skywatch]

@pepson Then just add another sensor from ground to digital pin 2 and change the code you see in the example to accommodate the extra input.

You'll need to add another child id, another button, another bounce function, another presentation, another send and another bounce call.

[pepson]

@skywatch
Yes but i dont know how do it.... :-(
I dont know programing.

[Nca78]

@pepson said in 💬 Door, Window and Push-button Sensor:

@skywatch
Yes but i dont know how do it.... :-(
I dont know programing.

Not an excuse, it's time for you to learn :)

[gohan]

@pepson then it is going to be quite difficult for you to work on DIY electronics projects if you don't how to program.