Proposed Design

Feature	Note
Wireless Solar Car-Chase Car	ASC
Wireless Solar Car-Pit	FSGP
Data Logging with Micro-SD
GPS
RTC	Timestamp the log
Backup Battery	Able to listen to the CAN bus during start-up and shutdown

Wireless Protocols

We should consider to a combination of options to ensure a stable connection during ASC and FSGP

Protocol	Range/Coverage	Data Rate
Wi-Fi	100 m (typical) 3-5 km (long-range & omnidirectional) Direct line-of-sight to the router	> 36.1 Mbps
LoRa	10 km Better non-line-of-sight performance due to a lower frequency of 915 MHz than 2.4 GHz	< 27 kbps
LTE/LTE-M	Verizon has LTE coverage over the FSGP track and most of the roads along the ASC route Direct line-of-sight to the tower	< 300 kbps
CAN		= 500 kps

Method	Description
CAN → Ethernet → Wi-Fi	Used a the CAN-ethernet bright and a Ubiquiti Wi-Fi stick during the 2018 ASC. Experienced connection issues during the 2018 FSGP
CAN → LTE (RPi) → Internet → Wi-Fi	Used the RPi to connect to a pub-sub server on the internet via a LTE dongle during the 2019 FSGP. The pit stop listened to the server via the Wi-Fi
CAN → Wi-Fi	We can consider a low-power Wi-Fi MCU, such as ESP32
CAN → LoRa	We may need to filter or delay non-essential CAN messages due to limited bandwidth
CAN → Wi-Fi → LTE (Phone)	We can use a portable LTE hotspot or a phone to connect the Wi-Fi to the internet

This will have a web-app on someones laptop that will be able to view and log all the important data about the car's performance.

Lower priority, mostly a front end display data kinda thing.

Section	Information Visible
Battery	Voltages, temperatures, charge, etc
Relay States	Motors, battery, solar
Solar Cell	Voltages, temperatures, etc.
Power Consumption	Battery pack, each board, each light, motors, etc.
Charging	Current, voltage, state of charge, calculation of time left till full charge, etc.