Payload function corresponding to the GROVE_CO2.ino Sketch
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function Decoder(bytes, port) { | |
// bytes is of type Buffer. | |
'use strict'; | |
var TEMPSENSOR_ID, | |
HUMISENSOR_ID, | |
PRESSURESENSOR_ID, | |
LUXSENSOR_ID, | |
UVSENSOR_ID, | |
PM10_ID, | |
PM25_ID, | |
CO2_ID; | |
switch (port) { | |
case 1: | |
TEMPSENSOR_ID = ''; | |
HUMISENSOR_ID = ''; | |
PRESSURESENSOR_ID = ''; | |
LUXSENSOR_ID = ''; | |
UVSENSOR_ID = ''; | |
PM10_ID = ''; | |
PM25_ID = ''; | |
CO2_ID = ''; | |
break; | |
default: | |
throw new Error('No configured sensor IDs for uplink on port: ' + port); | |
} | |
var bytesToInt = function (bytes) { | |
var i = 0; | |
for (var x = 0; x < bytes.length; x++) { | |
i |= +(bytes[x] << (x * 8)); | |
} | |
return i; | |
}; | |
var uint8 = function (bytes) { | |
if (bytes.length !== uint8.BYTES) { | |
throw new Error('int must have exactly 1 byte'); | |
} | |
return bytesToInt(bytes); | |
}; | |
uint8.BYTES = 1; | |
var uint16 = function (bytes) { | |
if (bytes.length !== uint16.BYTES) { | |
throw new Error('int must have exactly 2 bytes'); | |
} | |
return bytesToInt(bytes); | |
}; | |
uint16.BYTES = 2; | |
var humidity = function (bytes) { | |
if (bytes.length !== humidity.BYTES) { | |
throw new Error('Humidity must have exactly 2 bytes'); | |
} | |
var h = bytesToInt(bytes); | |
return h / 1e2; | |
}; | |
humidity.BYTES = 2; | |
var decode = function (bytes, mask, names) { | |
var maskLength = mask.reduce(function (prev, cur) { | |
return prev + cur.BYTES; | |
}, 0); | |
if (bytes.length < maskLength) { | |
throw new Error('Mask length is ' + maskLength + ' whereas input is ' + bytes.length); | |
} | |
names = names || []; | |
var offset = 0; | |
return mask | |
.map(function (decodeFn) { | |
var current = bytes.slice(offset, offset += decodeFn.BYTES); | |
return decodeFn(current); | |
}) | |
.reduce(function (prev, cur, idx) { | |
prev[names[idx] || idx] = cur; | |
return prev; | |
}, {}); | |
}; | |
var bytesToSenseBoxJson = function (bytes) { | |
var json; | |
try { | |
json = decode(bytes, | |
[ | |
uint16, | |
humidity, | |
uint16, | |
uint8, | |
uint16, | |
uint8, | |
uint16, | |
uint16, | |
uint16, | |
uint16 | |
], | |
[ | |
TEMPSENSOR_ID, | |
HUMISENSOR_ID, | |
PRESSURESENSOR_ID, | |
LUXSENSOR_ID + '_mod', | |
LUXSENSOR_ID + '_times', | |
UVSENSOR_ID + '_mod', | |
UVSENSOR_ID + '_times', | |
PM10_ID, | |
PM25_ID, | |
CO2_ID | |
]); | |
//temp | |
json[TEMPSENSOR_ID] = parseFloat(((json[TEMPSENSOR_ID] / 771) - 18).toFixed(1)); | |
//hum | |
json[HUMISENSOR_ID] = parseFloat(json[HUMISENSOR_ID].toFixed(1)); | |
// lux | |
json[LUXSENSOR_ID] = (json[LUXSENSOR_ID + '_times'] * 255) + json[LUXSENSOR_ID + '_mod']; | |
delete json[LUXSENSOR_ID + '_times']; | |
delete json[LUXSENSOR_ID + '_mod']; | |
// uv | |
json[UVSENSOR_ID] = (json[UVSENSOR_ID + '_times'] * 255) + json[UVSENSOR_ID + '_mod']; | |
delete json[UVSENSOR_ID + '_times']; | |
delete json[UVSENSOR_ID + '_mod']; | |
// pressure | |
if (json[PRESSURESENSOR_ID] !== '0') { | |
json[PRESSURESENSOR_ID] = parseFloat(((json[PRESSURESENSOR_ID] / 81.9187) + 300).toFixed(1)); | |
} else { | |
delete json[PRESSURESENSOR_ID]; | |
} | |
// rain | |
// pm10 | |
json[PM10_ID] = parseFloat((json[PM10_ID] / 10).toFixed(1)); | |
// pm25 | |
json[PM25_ID] = parseFloat((json[PM25_ID] / 10).toFixed(1)); | |
json[CO2_ID] = parseFloat((json[CO2_ID] / 10).toFixed(1)); | |
} catch (e) { | |
json = { payload: bytes }; | |
} | |
return json; | |
}; | |
return bytesToSenseBoxJson(bytes); | |
} |
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