Hi all,
I am trying to read Temperature and Humidity values from 5 SHT4x sensors on my phone (google pixel 6) using an Arduino nano 33 BLE to send the data. I have built the app and coded the arduino.
Please find attached the Arduino code and app file attached. I am using BluetoothLE extension 20240822.
The app mostly works however the humidity readings for the 4th and 5th sensor are not being recieved and not updating for the 3rd sensor. I have attached a screen recording of this. I am not sure why as I have done the same for all the sensors.
Is there any obvious issues I am missing?
I am confident the hardware is correct as I have tested before adding bluetooth functionality, and when opening the serial monitor humidity values are present for these sensors.
Dear @wrprice02,
I had a look into both your arduino code and into the app and it seems that everything is correct.
I've also compared them with respect to the ones provided by Settorezero (I'm Italian, therefore the explanations written in italian were very simple for me to read ) and I've just seen that in the setup function the author sets to 0 and sends those values once, before the first advertise:
// characteristics initial values
chAX.writeValue(0);
chAY.writeValue(0);
chAZ.writeValue(0);
chGX.writeValue(0);
chGY.writeValue(0);
chGZ.writeValue(0);
chBAP.writeValue(0);
chBA.writeValue(0);
// start advertising
BLE.advertise();
Probably this doesn't change anything, but have you tried it before removing those sendings ?
Another suggestion is to verify if there are some issues with the number of channels, you can try to send only the humidity values, for example by commenting out the temperature values , like this:
/* chTemp1.writeValue(temperatures[0]);
chTemp2.writeValue(temperatures[1]);
chTemp3.writeValue(temperatures[2]);
chTemp4.writeValue(temperatures[3]);
chTemp5.writeValue(temperatures[4]);*/
In this way you'll send only the five values related to humidity and you could see if the last two will be always stuck to 0 and the third stuck at a steady initial value.
I understand that on the Serial Monitor you see these values changing correctly, but we are not sure about what happens in the BLE transmission.
Last hint (for now): you can try to insert a 10 milliseconds delay between the transmissions.
Don't use the delay() function, but write your own, like:
void MyDelay()
{
unsigned long now = millis(); // fix the instant
while ((millis() - now) < 10UL); // do nothing until 10 milliseconds are elapsed,
}
because the standard delay() function stops the CPU, and this might block the BLE transmission as well.
Best wishes.
EDIT:
I've seen another difference between your code and the author's one. here
void updateValues() {
static float temperatures[5];
static float humidities[5];
By declaring those arrays as Static, their values, though visible only within the function, they won't change between two calls to the function. It might help too...
It might help to diagnose the problem if there were a way to see how fresh the various readings are.
Maybe devote a continually running Clock to resetting all Labels to non-bold every two seconds, and have the incoming float catcher set the corresponding Label for the incoming characteristic to .Bold = true?
void selectI2CChannel(uint8_t channel) {
if (channel > 7) return;
Wire.beginTransmission(TCA9548A_ADDR);
Wire.write(1 << channel);
Wire.endTransmission();
}
I guess this code is to configure the I2C bus MUX ?
Is this your device ?
Can you post your wiring ?
Or, can you assure that on the Arduino Serial Monitor all 10 data are shown correctly, in terms of reliability of values and updating rate ?
Nice to read that
If sometimes a sensor is missing you can still play with a slightly longer or shorter delay ? Sometimes it's a matter of 1 ot 2 milliseconds that makes the difference.
All the best !!!
) and I've just seen that in the setup function the author sets to 0 and sends those values once, before the first advertise:
