Topics created by mikee

Oh thanks everybody, I'll try it today.

@mikee You would want the MPX5010DP instead to get a 5V analog output for Arduino ADC, but still - to detect increased filter pressure drop I'd say you'll need 10Pa resolution. With MPX5010DP you'll get 10kPa/1024=9.75, i.e. OK. I guess you'd be able to detect something despite the noise, but not an early warning or trending. (You would want a 0..1kPa range sensor or something instead to do that. I don't now which one.) Give it a try and please report back! If you search the internet for "arduino MPX2010DP" you'll find a few projects measuring water level.

I use digital output. The R&C modification works only with digital output.

For the 2.4 GHz part, the nRF is a transceiver meaning it does both TX and RX. For the 433 mhz part, the PCB referenced in the first post has an "Aurel RTX-MID" which is a transceiver and thus both TX and RX so you can receive RF signals from 433mhz devices and also send commands via RF to 433mhz switches, doorbells etc. The software provides state switching signals to control the transceiver mode if one is used. Of course you do not need to use a transceiver, seperate TX and RX modules works just as well. You can use almost any a separate receiver and transmitter module like mentioned before.. For sending you can use a cheap Chinese transmitter (like the FS1000A XY-FST from the XY-M5-5V set) which can be nice as many people have these lying around.. The receiver from such a set is in most cases pretty poor because it receives a lot of noise. (Btw, these Chinese sets seem to perform a little bit better at higher voltages.)

@mikee in the setup loop for the temp sensors you are also presenting the relay. So one time for each temp sensor. You can just place it outside of the loop. for (int i=0; i<numSensors && i<MAX_ATTACHED_DS18B20; i++) { gw.present(i, S_TEMP); gw.present(RELAY_CHILD, S_LIGHT); digitalWrite(RELAY_PIN, RELAY_OFF); pinMode(RELAY_PIN, OUTPUT); } It won't solve your problem but is more decent. Then try to make sure you are getting the relay input from the controller by looking at the serial output of the node