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SKYDEW initial #229

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Merged
LukePrior merged 1 commit into from
Jan 18, 2022
Merged

SKYDEW initial #229

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94 changes: 94 additions & 0 deletions js/xdata.js
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Original file line number Diff line number Diff line change
Expand Up @@ -446,6 +446,94 @@ function parseFLASHB(xdata, pressure, temperature) {
return _output
}

function parseSKYDEW(xdata) {
// Attempt to parse an XDATA string from a Peltier-based chilled-mirror hygrometer SKYDEW
// Returns an object with parameters to be added to the sondes telemetry.
//
// References:
// Peltier-based chilled-mirror hygrometer “SKYDEW” XDATA protocol (draft)
//
// Sample data: 3F0144A75446416100160ECAFFFF6EC8000006 (length = 38 characters)

// Run some checks over the input
if(xdata.length != 38){
// Invalid SKYDEW dataset
return {};
}

if(xdata.substr(0,2) !== '3F'){
// Not a SKYDEW (shouldn't get here)
return {};
}

var _output = {};

// Instrument number is common to all XDATA types.
_output['skydew_instrument_number'] = parseInt(xdata.substr(2,2),16);

// Mirror temperature value
// This requires the four coefficients to actually get a value
_output['skydew_mirror_temperature_value'] = parseInt(xdata.substr(4,4),16);

// Scattered light level
_scattered_light_value = parseInt(xdata.substr(8,4),16);
_scattered_light_value = _scattered_light_value*0.0000625 // V
_output['skydew_scattered_light'] = Math.round(_scattered_light_value * 10000) / 10000; // 4 DP

// Reference resistance
// Used to calculate mirror temperature
_reference_resistance = parseInt(xdata.substr(12,4),16);

// Offset value
// Used to calculate mirror temperature
_offset_value = parseInt(xdata.substr(16,4),16);

// Peltier current
_peltier_current_value = parseInt(xdata.substr(20,4),16);
_peltier_current_value = (_peltier_current_value*0.00040649414 - 1.5)*2; // A
_output['skydew_peltier_current'] = Math.round(_peltier_current_value * 10000) / 10000; // 4 DP

// Heatsink temperature
_heatsink_temperature = parseInt(xdata.substr(24,2),16);
_heatsink_temperature = (Math.pow((((Math.log(((_heatsink_temperature/8192)*141.9)/(3.3-(_heatsink_temperature/8192)*3.3)/6))/3390)+1)/273.16, -1) -276.16); // Degrees C
_output['skydew_heatsink_temperature'] = Math.round(_heatsink_temperature * 100) / 100; // 2 DP

// Circuit board temperature
_circuit_board_temperature = parseInt(xdata.substr(26,2),16);
_circuit_board_temperature = (Math.pow((((Math.log(((_circuit_board_temperature/8192)*39.6)/(3.3-(_circuit_board_temperature/8192)*3.3)/6))/3390)+1)/273.16, -1) -276.16); // Degrees C
_output['skydew_circuit_board_temperature'] = Math.round(_circuit_board_temperature * 100) / 100; // 2 DP

// Battery
_output['skydew_battery'] = parseInt(xdata.substr(28,2),16);

// PID
_output['skydew_pid'] = parseInt(xdata.substr(30,2),16);

// Parameter
var parameter = parseInt(xdata.substr(32,4),16);

// Coefficent type
var parameterType = parseInt(xdata.substr(36,2),16);

// Parameter Type
switch(parameterType) {
case 0:
_output['skydew_serial_number'] = parameter;
case 1:
_output['skydew_coefficient_b'] = parameter;
case 2:
_output['skydew_coefficient_c'] = parameter;
case 3:
_output['skydew_coefficient_d'] = parameter;
case 4:
_output['skydew_coefficient_e'] = parameter;
case 5:
_output['skydew_firmware_version'] = parameter;
}

return _output
}

function parseXDATA(data, pressure, temperature){
// Accept an XDATA string, or multiple XDATA entries, delimited by '#'
// Attempt to parse each one, and return an object
Expand Down Expand Up @@ -487,6 +575,10 @@ function parseXDATA(data, pressure, temperature){
if (!_instruments.includes("OIF411")) _instruments.push('OIF411');
} else if (_instrument === '08'){
// CFH
// 0803B922067F1D0707CD0144
// 0803ABD602800F7907D9015D
// 08038AB16A7FBF4908E50161
// https://www.en-sci.com/cryogenic-frost-point-hygrometer/
if (!_instruments.includes("CFH")) _instruments.push('CFH');
} else if (_instrument === '10'){
// FPH
Expand Down Expand Up @@ -520,6 +612,8 @@ function parseXDATA(data, pressure, temperature){
if (!_instruments.includes("TRAPS")) _instruments.push('TRAPS');
} else if (_instrument === '3F'){
// SKYDEW
_xdata_temp = parseSKYDEW(_current_xdata);
_output = Object.assign(_output,_xdata_temp);
if (!_instruments.includes("SKYDEW")) _instruments.push('SKYDEW');
} else if (_instrument === '41'){
// CICANUM
Expand Down