TMAG5273

Sensors
1

I am using TMAG5273 sensor to detect magnetic field of a relay. I want to know how fast using your library can we poll the XYZ axes values? I want to poll it in every 1ms.

2

I think it depends on the I2C speed…

3

I am asking about interval between two successive polls. I think that should not depend upon I2C.

4

You’ll have to test it experimentally to know for sure, but:

To determine how fast you can poll the XYZ axes values from the TMAG5273 sensor using the SparkFun library, we need to consider a few factors:

Sensor capabilities: The TMAG5273 has a maximum output data rate of 1000 Hz (1 ms period) for single-axis measurements, and 600 Hz (1.67 ms period) for three-axis measurements.
I2C communication speed: The sensor uses I2C for communication, which can operate at different speeds (Standard Mode: 100 kHz, Fast Mode: 400 kHz, Fast Mode Plus: 1 MHz).
Microcontroller processing time: The time required for your microcontroller to process the data and execute any additional code.
Library implementation: The efficiency of the SparkFun TMAG5273 library.

Given these factors, polling every 1 ms (1000 Hz) for all three axes might be challenging. Here’s what you can expect:

For single-axis measurements, you might achieve close to 1 ms polling, but it would likely be slightly slower due to communication and processing overhead.
For three-axis measurements, the maximum theoretical rate is about 1.67 ms (600 Hz) due to the sensor’s limitations.
To get a precise answer, you would need to test the polling rate with your specific setup. Here’s a simple code snippet to measure the actual polling time:

#include <SparkFun_TMAG5273_Arduino_Library.h>

TMAG5273 sensor;

void setup() {
Wire.begin();
Serial.begin(115200);
sensor.begin();
// Configure sensor for maximum speed
sensor.setOutputDataRate(TMAG5273_ODR_1000);
}

void loop() {
unsigned long start = micros();

float x = sensor.getMeasureX();
float y = sensor.getMeasureY();
float z = sensor.getMeasureZ();

unsigned long end = micros();

Serial.print("Polling time (us): ");
Serial.println(end - start);

// Add a small delay to avoid flooding the serial monitor
delay(100);
}

This code will measure and print the time taken to poll all three axes. Run this on your setup to get the actual polling time.

If you need faster polling, you might consider:

Using the sensor’s interrupt feature for data-ready signaling.
Optimizing the I2C communication speed.
Using a faster microcontroller if your current one is a bottleneck.
Polling only the axes you need (if you don’t need all three).

Achieving a 1 ms polling rate for all three axes may not be possible due to the sensor’s limitations. If you need faster data acquisition, you might need to look into other sensor options or consider using the TMAG5273’s built-in FIFO buffer to collect data at high speeds and then read it in bursts