Comments (3)
fivdi
commented on June 15, 2024
The max. sampling rate will depend on many factors, for example:
- The Node version
- The Linux version
- The SPI device driver
- The board (Raspberry Pi 0, 1, 2, 3 or 4, BeagleBone, BeagleBone Black, ...)
- The system load
- ...
The below program samples the voltage on channel 4 of an MCP3008 and prints the number of samples per second.
const mcpadc = require('mcp-spi-adc');
const assert = require('assert');
let voltageReading;
let samplesPerSec = 0;
const voltageSensor = mcpadc.open(4, err => {
assert(!err, 'can\'t open voltage sensor');
const next = _ => {
voltageSensor.read((err, reading) => {
assert(!err, 'can\'t read voltage sensor');
voltageReading = reading;
samplesPerSec += 1;
next();
});
};
next();
});
setInterval(_ => {
console.log(
'samples per sec: ' + samplesPerSec +
', v: ' + (voltageReading.value * 3.3)
);
samplesPerSec = 0;
}, 1000);If this program is run using Node 14 on a Raspberry Pi 2 running Linux raspberrypi 4.19.57-v7+ with no additional system load it prints the following:
samples per sec: 3667, v: 1.6580645161290322
samples per sec: 3935, v: 1.6548387096774193
samples per sec: 4207, v: 1.6580645161290322
samples per sec: 4178, v: 1.661290322580645
samples per sec: 4168, v: 1.661290322580645
samples per sec: 4307, v: 1.661290322580645
samples per sec: 4481, v: 1.661290322580645
samples per sec: 4459, v: 1.661290322580645
samples per sec: 4390, v: 1.6580645161290322
samples per sec: 4319, v: 1.6580645161290322
samples per sec: 4021, v: 1.6580645161290322
samples per sec: 4226, v: 1.6580645161290322
samples per sec: 4198, v: 1.6580645161290322
samples per sec: 4255, v: 1.6580645161290322
samples per sec: 4404, v: 1.6580645161290322
samples per sec: 4429, v: 1.6580645161290322
samples per sec: 4443, v: 1.6580645161290322
samples per sec: 4402, v: 1.6580645161290322
samples per sec: 4478, v: 1.6580645161290322
samples per sec: 4480, v: 1.6580645161290322
samples per sec: 4481, v: 1.6580645161290322
samples per sec: 4432, v: 1.6548387096774193
samples per sec: 4472, v: 1.6580645161290322
samples per sec: 4473, v: 1.6580645161290322
samples per sec: 4424, v: 1.6580645161290322
samples per sec: 4470, v: 1.6548387096774193
samples per sec: 4477, v: 1.6548387096774193
samples per sec: 4399, v: 1.6548387096774193
samples per sec: 4465, v: 1.6548387096774193
samples per sec: 4467, v: 1.6548387096774193
samples per sec: 4471, v: 1.6580645161290322
samples per sec: 4427, v: 1.6548387096774193
samples per sec: 4473, v: 1.6548387096774193
samples per sec: 4463, v: 1.6580645161290322
samples per sec: 4430, v: 1.6580645161290322
samples per sec: 4486, v: 1.6548387096774193
samples per sec: 4549, v: 1.6580645161290322
samples per sec: 4495, v: 1.6580645161290322
samples per sec: 4548, v: 1.6580645161290322
samples per sec: 4542, v: 1.6548387096774193
samples per sec: 4514, v: 1.6580645161290322
samples per sec: 4545, v: 1.6580645161290322
samples per sec: 4545, v: 1.6580645161290322
samples per sec: 4432, v: 1.6580645161290322
samples per sec: 4468, v: 1.6580645161290322
samples per sec: 4474, v: 1.6580645161290322
samples per sec: 4475, v: 1.6580645161290322
...
Give the program a try on your system to see what's possible.
Note that Linux is not a real time operating system so there are no guarantees about timing.
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ZaneL
commented on June 15, 2024
Thank you so much!!
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meta-meta
commented on June 15, 2024
Any ideas how to get a faster sampling rate? I'm on a Pi Zero W, reading 6 pins and getting maybe 600 samples per second. I don't necessarily need all 10 bits if that makes a difference. I'm trying to get a digital reading from IR sensors which I can do with GPIO but being able to decide 0|1 with a threshold in software is valuable.
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