Node.js module for the MAX31865 thermocouple amplifier using spi-device.
$ npm install --save max31865const MAX31865 = require('max31865');
const sensor = new MAX31865(0, 0); // For /dev/spidev0.0
async function main() {
await sensor.init();
const tempC = await sensor.getTemperature();
};
main()
.catch(console.error);See examples/index.js for a full usage example.
You can configure the used sensor using the following options for the constructor. This example shows the default values.
const sensor = new MAX31865(
0, // bus - first digit in /dev/spidev0.0
0, // device - second digit in /dev/spidev0.0
{
rtdNominal: 100, // nominal resistance of sensor
refResistor: 430, // reference resistance on board
wires: 2, // wires used for sensor (2, 3 or 4)
}
);Has to be called once before all other methods. It initilizes the library and sensor for futher usage.
Returns a promise.
Usage example:
sensor.init()
.then(() => {
// Work with sensor
});Reads the resistance of the sensor and returns the temperature in degree celsius.
Returns a promise resolving with the temperature value.
Usage example:
sensor.getTemperature()
.then((temperature) => {
console.log(`Temperature: ${temperature} °C`);
});Read the resistance value from the RTD in Ω.
Returns a promise resolving with the resistance value.
Usage example:
sensor.getResistance()
.then((resistance) => {
console.log(`Resistance: ${resistance} Ω`);
});Read out the integrated fault detection.
Returns a promise resolving with an object of faults and if they have been detected.
Usage example:
sensor.getFaults()
.then((faults) => {
console.log('Faults', faults);
});Reads the raw ADC convertered value from the RTD sensor.
Returns a promise resolving with the raw RTD value.
Usage example:
sensor.readRtd()
.then((raw) => {
console.log(`Raw RTD value: ${raw}`);
});