8/19/2023 0 Comments Arduino delay 30 secondsLMIC does not currently offer a solid API to get at this info. What you’d want to do in this case is sleep until the TX time has approached. This is not something that I think should change. ![]() when the duty cycle limitation from that previous packet is still preventing TX), then that duty cycle limitation will indeed delay TX_COMPLETE (but not from the duty cycle delay after the next packet, but before the next packet). What I meant was that, if you tell LMIC to transmit a packet shortly after a previous packet (e.g. † While, officially, a different frequency could be used for the next transmission much sooner? So yes, send less often, and send binary, like already suggested. Or are the float values much longer than 12.34, Even though the current sleep of 64 seconds seems very low for temperature readings, and yields a daily air time far above the TTN Fair Access Policy when sending 20+ bytes. But even then, 20-30 seconds seems far too long for about 21 bytes to send something like T:12.34H:12.34B:12.34 on SF7, where a 1% duty cycle yields something like 7 seconds waiting time after sending? I think Diederik does not want to transmit more often*, but just wants to sleep more?īut indeed, it seems that the EV_TXCOMPLETE not only takes receive windows into account, but also duty cycles †, and then keeps the device awake. No, because then you would violate the duty cycle regulations for the frequencies used. It looks like the device is waiting for a TX window. Decide what resolutions you need for each as a minimum and fit it in the 24 bits (3 bytes)! For battery level you can even reduce to 5 or 6 bits, which gives you even more resolution for the temperature. If you use 7 bits for battery, 7 bits for humidity, then you have 10 bits left for temperature. on a second thought, you actually need three bytes if you want to have temperature, humidity and battery level. This will drastically reduce the time you have to wait between sending packets. Send those two bytes, and reconstruct your temperature, humidity and battery level in your application (you can even do this in the ttn backend, before the data is delivered by mqtt). String message = “T:” + String(t)+“H:” + String(h)+“B:”+ String(b) ĭepending on the resolution you need, you can probably reduce this to 2 bytes max!ġ byte for temperature (decide what your expected range will be, for example -20 -> 50 celcius, then normalize this so you use 1 byte (0…255), For the second byte combine the humidity (0…100) and battery level (0…100). ![]() DiederikRhee/ProMini_Lora_Otaa_temperture/blob/master/Lora_temp_hum/Lora_temp_hum.ino #include Is it possible to remove this? I think it must be possible to send the data really quick. With this code the device wakes up for 20-30 secondes. The problem now is that it takes really long to send the data. When the arduino is in sleep (with lowpower library) it uses around 0.02mA. I’m using an arduino pro mini 8mhz 3.3V (with led and regulator removed) + RFM95W + DHT22. With the help of and my node is now really power effient.
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