I have an Adafruit MPRLS sensor and it is well connected with
Arduino to get some pressure readings.
The serial monitor says:
-> MPRLS Simple Test
-> Failed to communicate with MPRLS sensor, check wiring?
I am using the Adafruit MPRLS library and mprls_simplest code.
I have followed the following page to arrange the circuit and the library
https://learn.adafruit.com/adafruit-mpr ... duino-test

Please, let me know how can I fix this issue.

https://github.com/adafruit/Adafruit_BusIO

There are two while loops in readData() which can turn into forever-loops if hardware is disconnected or things otherwise don't go as expected. Can I suggest adding a count variable, and something like this code inside each loop:

count++; delay(1); if(count>100) //Frozen or something return 0xFFFFFFFF; //Error

• Arduino board: Arduino Uno
• Arduino IDE version 1.8.13

Hi,

I found, that my code runs quite slow, when using the MPRLS library and reading from the sensor. I reported this issue in the Adafruit customers forum, see:
https://forums.adafruit.com/viewtopic.php?f=19&t=167853

In short, I was not able to read data from the sensor more than around 66 times per second (66Hz), although the sensors datasheet claims up to 200Hz.

The problem comes from the file "Adafruit_MPRLS.cpp", where the function "readData(void)" contains these lines:

// Use the gpio to tell end of conversion
if (_eoc != -1) {
while (!digitalRead(_eoc)) {
delay(10);
}
} else {
// check the status byte
uint8_t stat;
while ((stat = readStatus()) & MPRLS_STATUS_BUSY) {
// Serial.print("Status: "); Serial.println(stat, HEX);
delay(10);
}
}

Deleting the delays nearly doubled the speed of my readings to 125Hz. This is not as fast as advertised (I think you have to make use of the EOC-pin to become faster) but still a significant performance gain.

I suggest deleting the delays.

Thanks,

Larry

In the .h file (Adafruit_MPRLS.h) at line 44 & 45, the begin() function has two arguments: uint8_t i2c_addr and TwoWire *twoWire.

I also see they were assigned:
i2c_addr is assigned to MPRLS_DEFAULT_ADDR
and
twoWire is de-referenced to Wire. Where is this 'Wire' defined or instantiated?
My common sense says it's from 'Wire.h'