bt-sensors-plugin-sk/sensor_classes/VictronLynxSmartBMS.js

Bluetooth Sensors for Signalk - see https://www.npmjs.com/package/bt-sensors-plugin-sk#supported-sensors for a list of supported sensors

/*(Lynx Smart) BMS (0x0A)
Start Bit	Nr of Bits	Meaning	Units	Range	NA Value	Remark
32	8	Error	0x0	VE_REG_BMS_ERROR		
40	16	TTG	1min	0..45.5 days	0xFFFF	VE_REG_TTG
56	16	Battery voltage	0.01V	-327.68..327.66 V	0x7FFF	VE_REG_DC_CHANNEL1_VOLTAGE
72	16	Battery current	0.1A	-3276.8..3276.6	0x7FFF	VE_REG_DC_CHANNEL1_CURRENT
88	16	IO status			0x0	VE_REG_BMS_IO
104	18	Warnings/Alarms			0x0	VE_REG_BMS_WARNINGS_ALARMS
122	10	SOC	0.1%	0..100.0%	0x3FF	VE_REG_SOC
132	20	Consumed Ah	0.1Ah	-104,857..0 Ah	0xFFFFF	VE_REG_CAH Consumed Ah = -Record value
152	7	Temperature	°C	-40..86 °C	0x7F	VE_REG_BAT_TEMPERATURE Temperature = Record value - 40
159	1	Unused*/



const VictronSensor = require ("./Victron/VictronSensor.js") 
const VC = require("./Victron/VictronConstants.js")
const BitReader = require("./_BitReader")
class VictronLynxSmartBMS extends VictronSensor{

    static ImageFile="VictronLynxSmartBMS"
    initSchema(){
        super.initSchema()
        this.addDefaultParam("batteryID")
        this.addMetadatum('error','', 'error code', 
            (buff)=>{return buff.readUInt8(0)})
        .default="electrical.batteries.{batteryID}.errorCode"

        this.addDefaultPath('ttg','electrical.batteries.capacity.timeRemaining')
            .read=(buff)=>{return this.NaNif(buff.readUInt16LE(1),0xFFFF)*60}
        this.addDefaultPath('voltage','electrical.batteries.voltage')
            .read=(buff)=>{return this.NaNif(buff.readInt16LE(3),0x7FFF)/100}
        this.addDefaultPath('current','electrical.batteries.current') 
            .read=(buff)=>{return this.NaNif(buff.readInt16LE(5),0x7FFF)/10}
        
        this.addMetadatum('ioStatus','','IO Status', //TODO
            (buff)=>{return buff.readUInt16LE(7)})
        .default="electrical.batteries.{batteryID}.IOStatus"

        this.addMetadatum('warningsAndAlarms','','warnings and alarms (undocumented)')

        this.addDefaultPath('soc','electrical.batteries.capacity.stateOfCharge')
        
        this.addMetadatum('consumedAh','Ah','amp-hours consumed')
        .default="electrical.batteries.{batteryID}.capacity.ampHoursConsumed"
        
        this.addDefaultPath('temp', 'electrical.batteries.temperature')
    }
    emitValuesFrom(buffer){
        super.emitValuesFrom(buffer)
        const br = new BitReader(buffer.subarray(9))

        this.emit('warningsAndAlarms',br.read_unsigned_int(18))
        this.emit('soc',
            this.NaNif((br.read_unsigned_int(10),0x3FF)/1000))
        this.emit('consumedAh',
            this.NaNif(br.read_unsigned_int(20),0xFFFFF)/10 )
        this.emit('temp', 
            this.NaNif( br.read_unsigned_int(7),0x7f) +233.15)
 
    }
}
module.exports=VictronLynxSmartBMS