array[2]
0: array[2]
0: object
menge: 5627
1: object
typ: "inhalt"
einheit: "liter"
quelle: "drucksensor"
ort: "zisterne"
1: array[2]
0: object
menge: 71
1: object
typ: "inhalt"
einheit: "prozent"
quelle: "drucksensor"
ort: "zisterne"
// zistern litering table (got from manufacturer GRAF)
// first column = fillheight in mm
// second column = liter
const literingTable = [
[0, 0],
[100, 368],
[200, 976],
[300, 1621],
[400, 2339],
[500, 3153],
[600, 3796],
[700, 4609],
[800, 5341],
[900, 6057],
[1000, 6731],
[1100, 7301],
[1200, 7515],
[1260, 7550]
];
//var msg;
var msg2;
var msg3;
var msg4;
// pressure Sensor parameters
const max_height = 2; // 2m
const max_mA = 20; // mA at max_height
const min_mA = 4; // mA at zero height
// index to table for lowest level in zistern where water
// can still be pumped. Below pump cant reach the water
const percent_0_index = 2 // eg, 2 is 976l
//const lowest_level_Tindex = 2;
// Main starts here
var y;
var measured_mA = msg.payload; // get mA value from Sensor as input
var measured_mA_mean;
measured_mA_mean = context.get('measured_mA_mean');
if (context.get('Startup') == 341487) {
context.set("Startup", 0)
measured_mA_mean = measured_mA;
}
measured_mA_mean = (measured_mA_mean * 2 + measured_mA) / 3;
context.set('measured_mA_mean', measured_mA_mean);
if (measured_mA < min_mA){
// if its below allowed range, then exit
node.warn("Error ! Input Value below 4mA")
return;
}
var high_mm = (max_height * 1000 / (max_mA - min_mA) * (measured_mA_mean - min_mA));
//var x = Math.round(high_mm);
var x = high_mm;
//search for fitting table area, getting index into table as i
for(var i = 0; i < literingTable.length; i++) {
if (literingTable[i][0] > x) break; // if "end entry" found, then exit
}
i = i - 1; // correct index to "start entry"
// check if index was inside table and not the last entry
if (i<literingTable.length-1){
// was inside table
// get values from table
var x1 = literingTable[i+0][0];
var y1 = literingTable[i+0][1];
var x2 = literingTable[i+1][0];
var y2 = literingTable[i+1][1];
// and calculate the value in between
y=(y1+((x-x1)/(x2-x1)*(y2-y1)));
}
else{
// was the last entry,
// so return last entry as fixe value from table
// no calcuation needed
y=literingTable[i+0][1]
}
// calculate percentage from table index 2 as 0% to last table index as 100%
var percent = 100 / (literingTable[literingTable.length-1][1] - literingTable[percent_0_index][1]);
percent = Math.round(((percent * (y - literingTable[percent_0_index][1])) * 1) * 1e0) / 1e0;
if (percent < 0){
percent = -1;
}
y = Math.round(y);
msg.payload = [
[ // first value
{ // influxdb2 fields
"menge": y
},
{ // influxdb2 tags
"typ": "inhalt",
"einheit": "liter",
"quelle": "drucksensor",
"ort": "zisterne"
}
],
[ // second value
{ // influxdb2 fields
"menge": percent
},
{ // influxdb2 tags
"typ": "inhalt",
"einheit": "prozent",
"quelle": "drucksensor",
"ort": "zisterne"
}
]
];
return [msg];
// Der Code hier wird ausgeführt,
// wenn der Node gestartet wird
if (context.get("Startup") === undefined) {
context.set("Startup", 341487)
}
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