Tesla Pack Monitor – Project Guide

1 Mission

Create a portable, self-contained tool that plugs into a Tesla battery pack, reads live brick voltages and temperatures, and clearly shows imbalance and health — all without needing a laptop on site.

Short-term (v1 – working device)

Wake the pack and talk to the BMS over CAN

Read all 96 brick voltages and 32 temperatures via message 0x6F2

Calculate imbalance and highlight the weakest modules/bricks

Show results on the built-in 2.4" screen using physical buttons

Work standalone — no phone or computer required on site

Save simple text / JSON reports

Longer-term potential

Better diagnostics

Per-brick CAC estimates, historical trends, clearer fault interpretation

Web dashboard

SoftAP mode so you can view live data on a phone browser when desired

Multi-platform

Support newer Tesla packs (Model 3/Y, Raven) with profile switching

Reporting

Generate TPM-style reports for records or resale documentation

2 Current Status

Overall progress to first working device ~48%

Completed

Done Hardware selected and ordered
Done Core data model (Pack → Modules → Bricks)
Done 0x6F2 decoder for brick voltages + temperatures
Done Full CLI tool with multiple modes
Done GitHub repo + local development setup
Done Project guide site

CLI capabilities now available

Option	Description
`./tpm`	Demo mode with synthetic data
`--log FILE`	Decode candump-style log files
`--can IFACE`	Live SocketCAN listener (ready for hardware)
`--json`	Machine-readable JSON output
`--weak N`	Control number of weakest bricks shown
`--report FILE`	Save human-readable text report

3 Roadmap to a Working Device

High-level sequence from today to a fully usable standalone tool.

1

Project foundation Data model, decoder, CLI, GitHub repo, local dev environment
2

Offline tooling complete Log support, JSON output, reports, polished CLI helper
3

Hardware arrives & assembly Build the enclosure, wire display, buttons, CAN HAT, and BMS pigtail
4

OS + SocketCAN on Radxa Boot the board, configure CAN interface, confirm 0x6F2 frames appear
5

Live CAN integration CLI reads live data from the real pack instead of demo/logs
6

Display + button UI Simple menu system on the 2.4" screen controlled by external buttons
7

First full standalone test Plug into the real 2015 85D pack, wake it, read voltages, view on screen
8

Polish & report output Cleaner UI, improved reports, optional SoftAP web view

4 Near-term Focus

Software foundation is in good shape. Next priority is hardware.

Wait for / receive remaining parts
Assemble the enclosure (display, buttons, Radxa + CAN HAT, BMS pigtail)
Bring up the Radxa Zero 3W and confirm SocketCAN works
Capture first real 0x6F2 frames from the pack
Begin the on-device display + button UI

Offline software development can continue in parallel (display UI skeleton, better report formatting, etc.), but the critical path is now hardware assembly and first live CAN capture.

5 Quick Reference

Repo

github.com/mikesudyk/tesla-pack-monitor

Run the CLI

./tpm · ./tpm --json · ./tpm --report scan.txt

Key CAN message

0x6F2 — 96 brick voltages + 32 temperatures

Target pack

2015 Tesla Model S 85D (Classic architecture, 16 modules)