Hello everyone,
in a nutshell: the pressure sensor does not measure the value as often as other sensors, but sends the same value several times and only updates about every second.
I want to use the RuuviTag as a permanent pressure gauge. To do this, I need to get the current pressure several times a second so that I can draw a diagram that is as accurate as possible.
To get more than just the specified heartbeat interval, I have adapted the firmware.
I adapted the current firmware version v3.33.0:
I set the APP_NUM_REPEATS to 1, as well as the APP_BLE_INTERVAL_MS to (100U) in application_mode_debug.h.
Apart from that, I haven’t changed anything in the firmware.
I now receive updates more frequently. My problem is that the measured pressure is sent the same several times, even though I have artificially increased the pressure around the RuuviTag, and it has changed permanently in reality.
Here is an excerpt from the measurement data with the according time (time, when my phone received the data):
Data
I/flutter ( 2663): [5, 18, 223, 78, 193, 205, 167, 1, 116, 2, 132, 2, 152, 191, 150, 49, 39, 240]
I/flutter ( 2663): 2024-08-25 11:21:20.146368
I/flutter ( 2663): [5, 18, 230, 78, 212, 205, 167, 1, 144, 2, 136, 2, 160, 191, 150, 49, 39, 242]
I/flutter ( 2663): 2024-08-25 11:21:20.152333
I/flutter ( 2663): [5, 18, 223, 78, 217, 216, 254, 1, 176, 2, 140, 2, 168, 191, 150, 49, 39, 243]
I/flutter ( 2663): 2024-08-25 11:21:20.635479
I/flutter ( 2663): [5, 18, 233, 78, 219, 216, 254, 1, 172, 2, 124, 2, 128, 191, 150, 49, 39, 244]
I/flutter ( 2663): 2024-08-25 11:21:20.641423
I/flutter ( 2663): [5, 18, 223, 78, 226, 216, 254, 1, 180, 2, 132, 2, 136, 191, 150, 49, 39, 245]
I/flutter ( 2663): 2024-08-25 11:21:20.646252
I/flutter ( 2663): [5, 18, 227, 78, 247, 216, 254, 1, 196, 2, 120, 2, 120, 191, 150, 49, 39, 248]
I/flutter ( 2663): 2024-08-25 11:21:21.152107
I/flutter ( 2663): [5, 18, 230, 79, 2, 216, 254, 1, 204, 2, 140, 2, 124, 191, 150, 49, 39, 249]
I/flutter ( 2663): 2024-08-25 11:21:21.159798
I/flutter ( 2663): [5, 18, 236, 79, 20, 216, 254, 1, 216, 2, 140, 2, 112, 191, 150, 49, 39, 250]
I/flutter ( 2663): 2024-08-25 11:21:21.163419
I/flutter ( 2663): [5, 18, 225, 79, 27, 216, 254, 1, 220, 2, 128, 2, 92, 191, 150, 49, 39, 251]
I/flutter ( 2663): 2024-08-25 11:21:21.166120
I/flutter ( 2663): [5, 18, 230, 79, 52, 228, 227, 1, 148, 2, 232, 2, 76, 191, 150, 49, 39, 253]
I/flutter ( 2663): 2024-08-25 11:21:21.652634
I/flutter ( 2663): [5, 18, 228, 79, 62, 228, 227, 1, 152, 2, 224, 2, 52, 191, 150, 49, 39, 254]
I/flutter ( 2663): 2024-08-25 11:21:21.655314
I/flutter ( 2663): [5, 18, 223, 79, 64, 228, 227, 1, 160, 2, 200, 2, 52, 191, 150, 49, 39, 255]
I/flutter ( 2663): 2024-08-25 11:21:21.658006
I/flutter ( 2663): [5, 18, 233, 79, 92, 228, 227, 1, 152, 2, 248, 2, 48, 191, 150, 49, 40, 0]
I/flutter ( 2663): 2024-08-25 11:21:21.660252
The data is roughly about one and a half seconds. Because it is in data format 5, the 5th and 6th array index show the pressure, which only changed two times in the shown data (from 205, 167 to 216, 254 to 228,227 It generally changes only about every second.
But other sensor data comes more often (e.g., the humidity at index 3–4) changes every time. The measurement sequence number is also incremented (index 16–17) permanently.
The problem occurs with various RuuviTags and also with the software version v3.30, which I have adapted simultaneously.
What can I do to receive pressure data updates ten times per second, as it should be?