Simple buffered data sampling Arduino tool useful for sampling at high frequencies (up to the limits of the microcontroller)
Logging data directly to SPI or I2C devices (such as SD card) is quite slow and a bottleneck due to write speed limits
Storing data directly to SRAM with a fixed size buffer is the fastest way to save data sampled at high frequencies, this library provides an easy way to do it.
The main drawback is that we have a limited buffer size restricted to the SRAM capabilities of the microcontroller.
Plotted using Plotly Chart Studio
#include <Arduino.h>
#include <DataSampler.h>
#define MAX_SAMPLES 900 // Sample list size
#define SAMPLES_PER_SEC 2000 // Sampling frequency in Hertz
DataSampler<uint8_t> sampler(MAX_SAMPLES, SAMPLES_PER_SEC);
void setup()
{
Serial.begin(115200);
// Set read sensor callback
sampler.setSamplerCallback([](uint8_t& value){
value = (uint8_t)(analogRead(A0) / 4);
});
Serial.println(F("Starting sampler in 1 sec"));
delay(1000);
Serial.println(F("Running sampler..."));
delay(100);
sampler.runSampler(); // Read and save all samples
// Print all samples:
Serial.println();
for (size_t i = 0; i < sampler.size(); i++)
{
Serial.println(sampler.getSample(i));
}
Serial.println();
}
void loop()
{
}Starting sampler in 1 sec
Running sampler...
Sampling took 0.450 seconds
With a total of 900 samples, averaging 0.500ms of time between samples
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