transmit humidity data

[cyrax72]

Please tell me how to use this library to transmit humidity data?

[floe]

I would suggest you start with the temperature example (https://github.com/floe/BTLE/blob/master/examples/temperature/temperature.ino) and change the UUID to the one for humidity (should be in the BTLE specification UUID list).

[cyrax72]

Thank you for your answer. I tried, I succeeded. However, I need battery power, temperature and humidity. I tried to use NRF_DEVICE_INFORMATION_SERVICE_UUID, but nothing works. Please tell me what I'm doing wrong?

`#include <BTLE.h> #include <RF24.h>

RF24 radio(9, 10); BTLE btle(&radio);

struct battery_level_data { uint16_t service_uuid; uint8_t battery_percentage; };

void setup() { Serial.begin(9600); Serial.println("BTLE multichunk sender"); btle.begin("RD"); //can be emptystring }

void loop() {

battery_level_data battery_data; battery_data.service_uuid = NRF_BATTERY_SERVICE_UUID; battery_data.battery_percentage = 80;

nrf_service_data temp_data; temp_data.service_uuid = NRF_TEMPERATURE_SERVICE_UUID; //temp_data.value = BTLE::to_nRF_Float(36); temp_data.value = 36;

nrf_service_data hum; hum.service_uuid = NRF_DEVICE_INFORMATION_SERVICE_UUID; //hum.value = BTLE::to_nRF_Float(77); hum.value = 77;

btle.preparePacket();

if (!btle.addChunk(0x16, sizeof(battery_data), &battery_data)) { Serial.println("Battery level does not fit"); }

if (!btle.addChunk(0x16, sizeof(temp_data), &temp_data)) { Serial.println("Temperature does not fit"); }

if (!btle.addChunk(0x16, sizeof(hum), &hum)) { Serial.println("hum does not fit"); }

btle.transmitPacket(); btle.hopChannel();

delay(500); }`

[floe]

INFORMATION_SERVICE won't work for humidity, that's something entirely different. 0x2A6F seems to be correct, see also here: https://github.com/NordicSemiconductor/Android-nRF-Connect/issues/52

[cyrax72]

I probably asked the question not quite correctly .. I managed to send the humidity, as you advised, replacing 0x1809 with 0x2A6F. But I do not understand how to transfer 3 parameters at once in one package - tempurature, humidity, and battery charge. My sensor needs all of them.

[floe]

I think the code you posted actually looks pretty correct (apart from the humidity UUID). What does e.g. the nRF Connect app show for your device when all 3 parameters are present?

[cyrax72]

Only 2 parameters will arrive in NRF connect. There is no third at all (humidity). The message "hum does not fit" arrives in the serial port. It feels like btle.addChunk doesn't add a third parameter. If we swap the blocks if (! btle.addChunk (0x16, sizeof (temp_data), & temp_data)) { Serial.println ("Temperature does not fit"); } and if (! btle.addChunk (0x16, sizeof (hum), & hum)) { Serial.println ("hum does not fit"); } in some places, then in the series the message "Temperature does not fit" and in the NRF connect there is no temperature ...

[floe]

OK, then you're running out of space in the advertisement, for the nRF24, you can only have at most 21 bytes of payload. Try setting the name to "" (empty string).