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: nordicsemi/Android-nRF-Connect#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).