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sensorData.js
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sensorData.js
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//Decode sensor data
const rshift = (value, n) => (value % 0x100000000) >> n
const twosComplement = (value, bits) => ((value & (1 << (bits - 1))) != 0) ? value = (value - (1 << bits)) : value
const decode = (rawData) => {
//Select decoder
if (rawData.length >= 6) {
if (rawData.substring(0, 4) == '9904') {
const format = parseInt(rawData.substring(4, 6), 16)
if (format == 3) {
return decodeDF3(rawData)
}
if (format == 5) {
return decodeDF5(rawData)
}
}
}
return {}
}
const decodeDF3 = (rawData) => {
//Data Format 3 (RAWv1)
const temperature = (rawTemp) => {
const temp = (((rawTemp & 0x7F00) >> 8) + (rawTemp & 0xFF) / 100)
if ((rawTemp & 0x8000) >> 15) {
return temp * -1
}
return temp
}
const humidity = (rawHumidity) => rawHumidity / 2
const pressure = (rawPressure) => (rawPressure + 50000) / 100
const acceleration = (rawAcc) => twosComplement(rawAcc, 16) / 1000
const voltage = (rawVoltage) => rawVoltage / 1000
if (rawData.length === 32) {
const format = parseInt(rawData.substring(4, 6), 16)
if (format == 3) {
const acc_x = acceleration(parseInt(rawData.substring(16, 20), 16))
const acc_y = acceleration(parseInt(rawData.substring(20, 24), 16))
const acc_z = acceleration(parseInt(rawData.substring(24, 28), 16))
return {
'format': format,
'temp': temperature(parseInt(rawData.substring(8, 12), 16)),
'humidity': humidity(parseInt(rawData.substring(6, 8), 16)),
'pressure': pressure(parseInt(rawData.substring(12, 16), 16)),
'acceleration': Math.round(Math.sqrt(acc_x * acc_x + acc_y * acc_y + acc_z * acc_z) * 1000) / 1000,
'accererations': {
'x': acc_x,
'y': acc_y,
'z': acc_z
},
'voltage': voltage(parseInt(rawData.substring(28, 32), 16))
}
}
}
return {}
}
const decodeDF5 = (rawData) => {
//Data Format 5 (RAWv2)
const temperature = (rawTemp) => rawTemp != 0x8000 ? twosComplement(rawTemp, 16) / 200 : undefined
const humidity = (rawHumidity) => rawHumidity != 0xFFFF ? rawHumidity / 400 : undefined
const pressure = (rawPressure) => rawPressure != 0xFFFF ? (rawPressure + 50000) / 100 : undefined
const acceleration = (rawAcc) => rawAcc != 0x8000 ? twosComplement(rawAcc, 16) / 1000 : undefined
const voltage = (rawPowerinfo) => {
const rawVoltage = rshift(rawPowerinfo, 5)
if (rawVoltage != 0x7FF) {
return (rawVoltage + 1600) / 1000
}
return undefined
}
const txpower = (rawPowerinfo) => {
const rawPower = rawPowerinfo & 0x1F
if (rawPower != 0x1F) {
return rawPower * 2 - 40
}
return undefined
}
const movementcounter = (rawMovecount) => rawMovecount != 0xFF ? rawMovecount : undefined
const measurementsequencenumber = (rawSeqnum) => rawSeqnum != 0xFFFF ? rawSeqnum : undefined
if (rawData.length === 52) {
const format = parseInt(rawData.substring(4, 6), 16)
if (format == 5) {
const acc_x = acceleration(parseInt(rawData.substring(18, 22), 16))
const acc_y = acceleration(parseInt(rawData.substring(22, 26), 16))
const acc_z = acceleration(parseInt(rawData.substring(26, 30), 16))
return {
'format': format,
'temp': temperature(parseInt(rawData.substring(6, 10), 16)),
'humidity': humidity(parseInt(rawData.substring(10, 14), 16)),
'pressure': pressure(parseInt(rawData.substring(14, 18), 16)),
'acceleration': Math.round(Math.sqrt(acc_x * acc_x + acc_y * acc_y + acc_z * acc_z) * 1000) / 1000,
'accererations': {
'x': acc_x,
'y': acc_y,
'z': acc_z
},
'voltage': voltage(parseInt(rawData.substring(30, 34), 16)),
'txpower': txpower(parseInt(rawData.substring(30, 34), 16)),
'movementcount': movementcounter(parseInt(rawData.substring(34, 36), 16)),
'measurementseqcount': measurementsequencenumber(parseInt(rawData.substring(36, 40), 16))
}
}
}
return {}
}
exports.decode = decode