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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.

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