Bobby-Car Telemetry PCB

This board should be mounted on the Bobby-Car.

There are 2 CAN bus connectors, pin-compatible with the boardcomputer PCB, and can either be wired:

• after the boardcomputer or
• in-line between the motorcontrollers and the boardcomputer

Hardware Features

• SN65HVD230 CAN transceiver
• ESP32-WROOM-32E (8MB)
• CH343G USB to UART converter for programming
• ATGM336H-5N31 GNSS
  • supports GPS (US), GLONASS (Russia), Galileo (EU), BeiDou (China), QZSS (Japan)
  • u.FL connector for active antenna
  • protocol compatible with NEO-6M
  • optional 3V rechargeable battery for fast cold start
• self bomb microSD card slot
• LM75B temperature sensor
• RA-01SH 868MHz LoRa module with two antenna options:
  • integrated u.FL connector for external helical antenna
  • solder jumper to enable the onboard PCB helical antenna
• TPMP2359DJ DC-DC converter (up to 30V input, 3.3V output), so board can be powered by:
  • USB-C connector (5V) or
  • CAN bus (12V-15V)
• TTL UART receive to receive log messages from the boardcomputer

Use cases

• Acquire data with onboard sensors and send it to the boardcomputer
  • GPS/GNSS time, position, speed, heading
  • temperature
• Log data to the microSD card:
  • GPS and temperature data
  • CAN BUS messages
  • LoRa messages
  • ESP-NOW messages
  • GPS-mapped Wi-Fi scan results
  • UART log messages from the boardcomputer
• GPS geofencing (slowdown/stop, notification to other Bobby-Cars)
• Calibrate wheel circumference by comparing GPS speed with wheel speed
• Send GPS position over LoRa so that:
  • other Bobby-Cars can show nearby Bobby-Cars on a radar display
  • the Bobby-Car can be tracked on a map in case of loss or theft
• Control actuators such as door openers, lights, etc. over LoRa
• Receive LoRa messages from environmental sensors such as weather stations, air quality sensors, etc.
• Send ESP-NOW beacons with the current UTC time to other Bobby-Cars that lack a GNSS receiver
• Upload microSD card data to a cloud service automatically when connected to a Wi-Fi network

Compliance

• Compliant with RED Directive 2014/53/EU (Radio Equipment Directive)
• Wi-Fi 2.4GHz 802.11b/g/n certified by Wi-Fi Alliance
• FCC ID of ESP32-WROOM-32E: 2AC7Z-ESP32WROOM32E
• Compliant with LVD Directive 2014/35/EU (Low Voltage Directive)
• Compliant with EMC standard EN 55032, EN 55024, EN 61000-6-2, EN 61000-6-4 (Class B)
• Compliant with RoHS Directive 2011/65/EU (Restriction of Hazardous Substances)
• Compliant with REACH Regulation (EC) No 1907/2006 (Registration, Evaluation, Authorisation and Restriction of Chemicals)
• Compliant with WEEE Directive 2012/19/EU (Waste Electrical and Electronic Equipment)
• Compliant with ELV Directive 2011/65/EU (End of Life Vehicle)
• Compliant with ISO 11898-1:2003 CAN bus physical layer and data link layer specifications