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sbms0-SerialToInfluxDB.py
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sbms0-SerialToInfluxDB.py
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#!/usr/bin/env python
"""
2020-05-26
Created 22 April 2007
By David A. Mellis <dam@mellis.org>
modified 2020-05-26
by David Buron
This example code is in the public domain.
"""
import os
import sys
import time
import serial
from influxdb import InfluxDBClient
# p - location of the data in the string, starting at 0!
# s - size of the data (for example, SOC is 2)
# d - the name of the variable in this case var sbms
def dcmp(p, s, d):
xx = 0;
for z in range(s):
# Java script: xx = xx + ((d.charCodeAt((p + s - 1) -z) -35) * Math.pow(91, z$))
wanted_ascii_character = ord(chr(d[(p + s - 1) - z]))
xx = xx + ((wanted_ascii_character - 35) * pow(91, z))
return xx
#Connect to local InfluxDB and Database
client = InfluxDBClient(host='localhost', port=8086)
client.switch_database('SBMS')
var_sbms = ''
# Receiving Data
while True:
x=os.path.exists('/dev/ttyUSB0')
#Open Serial connection from USB, SBMS0 must be set to same BAUD rate
if(x==1):
ser = serial.Serial('/dev/ttyUSB0', 115200)
data = ser.readline()
if not data:
break
var_sbms = data
#Debug output from SBMS0
# print(var_sbms)
# print(str(dcmp(0, 27, var_sbms)) + str(var_sbms[28]) + str(dcmp(29, len(var_sbms)-29, var_sbms)))
# process the SBMS data
SOC = float(dcmp(6, 2, var_sbms))
# print('PV SOC = ' + str(SOC) + '%')
# one of cell voltage has to be cast to a float
Cell1 = float(dcmp(8, 2, var_sbms)) / 1000
# print('Cell1 = ' + str(Cell1) + '\n')
Cell2 = float(dcmp(10, 2, var_sbms)) / 1000
# print('Cell2 = ' + str(Cell2) + '\n')
Cell3 = float(dcmp(12, 2, var_sbms)) / 1000
# print('Cell3 = ' + str(Cell3) + '\n')
Cell4 = float(dcmp(14, 2, var_sbms)) / 1000
# print('Cell4 = ' + str(Cell4) + '\n')
Cell5 = float(dcmp(16, 2, var_sbms)) / 1000
# print('Cell5 = ' + str(Cell5) + '\n')
Cell6 = float(dcmp(18, 2, var_sbms)) / 1000
# print('Cell6 = ' + str(Cell6) + '\n')
Cell7 = float(dcmp(20, 2, var_sbms)) / 1000
# print('Cell7 = ' + str(Cell7) + '\n')
Cell8 = float(dcmp(22, 2, var_sbms)) / 1000
# print('Cell8 = ' + str(Cell8) + '\n')
# Converted based on documentation: 0 to 1449 = -45C to 99.9C
# Converting to fahrenheit
Internal_temp = float((dcmp(24, 2, var_sbms)-450)/10*9/5+32)
Internal_temp = round(Internal_temp,3)
# print('Internal temp = ' + str(Internal_temp) + '\n')
# Converted based on documentation: 0 to 1449 = -45C to 99.9C
# Converting to fahrenheit
External_temp = float((dcmp(26, 2, var_sbms)-450)/10*9/5+32)
External_temp = round(External_temp,3)
# print('External temp = ' + str(External_temp) + '\n')
# Bat + and - sign at [28] is not compressed
sign = var_sbms[28]
Batt_current = round(float(dcmp(29, 3, var_sbms))/1000,3)
if(sign == '-'):
Batt_current = (-1)*Batt_current
# print('Battery current = ' + str(Batt_current) + '\n')
PV1 = float(dcmp(32, 3, var_sbms))
# print('PV1 current = ' + str(PV1) + '\n')
PV2 = float(dcmp(35, 3, var_sbms))
# print('PV2 current = ' + str(PV2) + '\n')
External_load = (dcmp(38, 3, var_sbms))
# print('External load current = ' + str(External_load) + '\n')
ADC2 = float(dcmp(41, 3, var_sbms))
# print('ADC2 = ' + str(ADC2) + '\n')
ADC3 = float(dcmp(44, 3, var_sbms))
# print('ADC3 = ' + str(ADC3) + '\n')
ADC4 = float(dcmp(47, 3, var_sbms))
# print('ADC4 = ' + str(ADC4) + '\n')
heat1 = float(dcmp(50, 3, var_sbms))
# print('heat1 = ' + str(heat1) + '\n')
heat2 = float(dcmp(53, 3, var_sbms))
# print('heat2 = ' + str(heat2) + '\n')
ERR = dcmp(56, 3, var_sbms)
# print('ERR_code = '+ str(ERR) + 'change to binary\n')
# calculations
Battery_voltage = (Cell1 + Cell2 + Cell3 + Cell4 + Cell5 + Cell6 + Cell7 + Cell8)
# Battery_voltage = round(Battery_voltage, 3)
# print('Battery voltage = ' + str(Battery_voltage) + 'V')
# External load
External_load = float(External_load / 1000)
External_load = round(External_load, 3)
# print('External Load current = ' + str(External_load) + 'A')
# Total PV current
PV_total_current = (PV1 + PV2) / 1000
PV_total_current = round(PV_total_current, 3)
# print('Total PV current = ' + str(PV_total_current) + 'A')
#Converting error to binary
Error_Binary = '{0:08b}'.format(ERR)
#Capturing SBMS0 flag values to array
flags = []
if(ERR & 16384):
flags.append('DFET')
if(ERR & 8192):
flags.append('EOC')
if(ERR & 4096):
flags.append('CFET')
if(ERR & 2048):
flags.append('ECCF')
if(ERR & 1024):
flags.append('LVC')
if(ERR & 512):
flags.append('OPEN')
if(ERR & 256):
flags.append('CELF')
if(ERR & 128):
flags.append('DSC')
if(ERR & 64):
flags.append('DOC')
if(ERR & 32):
flags.append('COC')
if(ERR & 16):
flags.append('IOT')
if(ERR & 8):
flags.append('UVLK')
if(ERR & 4):
flags.append('UV')
if(ERR & 2):
flags.append('OVLK')
if(ERR & 1):
flags.append('OV')
# Joining flags to a single string for simple output
separator = ", "
flags = separator.join(flags)
# Creating Cell Delta values
voltages = [Cell1,Cell2,Cell3,Cell4,Cell5,Cell6,Cell7,Cell8]
maxv = max(voltages)
minv = min(i for i in voltages if i > 0)
delta = maxv-minv
# print('Cell Voltage Delta = ' + str(delta) + 'V' + '\n')
# Create DB payload
json_body = [
{
"measurement": "SBMS_Metrics",
"tags": {
"Name": "SBMS0a"
},
"fields": {
"External Temperature": External_temp,
"Internal Temperature": Internal_temp,
"Monitor Flags": flags,
"Battery Voltage": Battery_voltage,
"Battery Current": Batt_current,
"PV Total Current": PV_total_current,
"PV1": PV1,
"PV2": PV2,
"External Load": External_load,
"State of Charge": SOC,
"ADC2": ADC2,
"ADC2": ADC3,
"ADC2": ADC4,
"Heat 1": heat1,
"Heat 2": heat2,
"Cell 1": Cell1,
"Cell 2": Cell2,
"Cell 3": Cell3,
"Cell 4": Cell4,
"Cell 5": Cell5,
"Cell 6": Cell6,
"Cell 7": Cell7,
"Cell 8": Cell8,
"Cell Delta": delta
}
}
]
# Write to DB
client.write_points(json_body)
else:
time.sleep(10)