Telemetry

Arduino system to process and transmit car data. Uses an Arduino Due with the following additional hardware:

• Digi Xbee3 LTE-M cellular modem connected to Serial2 for transmitting data
• Garmin 15x-W GPS connected to Serial1
  • White wire = ground (not needed)
  • Black wire = ground
  • Red wire = 3.3v
  • Yellow wire = pin 19 Rx1
  • Blue wire = pin 18 Tx1
  • Orange wire = ground (not needed)

Setup

• Install Arduino Due board using Arduino IDE boards manager
• Install the following libraries using Arduino IDE library manager:
  • TinyGPS
  • DueTimer
  • Scheduler
• Install the Arduino-MemoryFree library manually to %UserProfile%\Documents\Arduino\libraries

Impotant XBee note

The XBee modem starts atuomatically upon receiving power and must always be shutdown safely before disconnecting power, or else there is risk of permanent hardware damage. The green DI05 light on the XBee Arduino shield will be blinking when the modem is on and solid when the modem is off.

Transmitted data

Field	Unit	Type
pack_voltage	Volts	float
pack_soc	%	float
pack_current	Amps	float
min_pack_temp	Celsius	float
avg_pack_temp	Celsius	float
max_pack_temp	Celsius	float
min_cell_voltage	Volts	float
avg_cell_voltage	Volts	float
max_cell_voltage	Volts	float
input_voltage	Volts	float
bms_fault	Bit flags	unsigned int
motor_speed	MPH	float
motor_current	Amps	float
motor_controller_temp	Celsius	float
motor_temp	Celsius	float
motor_fault	Bit flags	unsigned int
solar_voltage	Volts	float
solar_fault	Bit flags	unsigned int
gps_course	Degrees	float
gps_time	hhmmsscc	string
gps_date	ddmmyy	string
gps_lat	Degrees	float
gps_lon	Degrees	float
gps_speed	MPH	float

Orion BMS Fields Reference

Field	BMS Field Name	Default PID
Battery Voltage	Pack Voltage	0xF00D
Battery Current	Signed Pack Current	0xF00C
Battery Temperature	Heatsink Temperature Sensor	0xF02D
Pack Charge	Pack State of Charge	0xF00F