esp.anej.dev BMW E81 · N47D20 · ESP32

BMW E81 · N47D20 · DDE7.0

A custom engine data display that lives in the dashboard.

ESP32 reads engine telemetry from the car, over OBD2 today and directly off the CAN bus tomorrow, and renders it on a flush-mounted TFT where the air-vent used to be. Fully open hardware, fully documented, built one version at a time.

See the roadmap → Technical docs → Full-screen 3D view →
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Why I built this

The pre-2008 BMW E-series dashboards show almost nothing about what the engine is actually doing. There's a coolant gauge and a fuel gauge. That's it. No boost, no oil temperature, no DPF soot load, no real-time RPM above the big analog needle.

I drive a 2007 E81 118d — N47 diesel, DDE7.0 ECU — and I wanted the same engine data a modern dash would give me, without ripping out factory trim. So I set out to build a small display that plugs in through the OBD2 port first, then moves onto the CAN bus directly, and eventually lives flush in the air-vent slot with OTA firmware updates.

This site documents every step of that project: the wiring, the PIDs, the sketches, and the hardware. The repository has the source, the docs, and the roadmap.

Current phases

v0.1

Done

0.96" SSD1306 OLED · Fake / animated

Proof-of-concept: ESP32 drives a 0.96-inch OLED with animated fake gauges. Validates the display layer and UI rendering path before any OBD hardware is in hand.

v0.2

Waiting on parts

0.96" SSD1306 OLED · Bluetooth ELM327

First real-data build: ESP32 pairs with a Bluetooth ELM327 dongle plugged into the OBD2 port, no cables, no soldering, and displays live engine values on the 0.96" OLED.

v0.3

Waiting on parts

3.2" ILI9488 TFT (SPI) · Fake / animated

Upgrades the display from 0.96" OLED to a 3.2-inch SPI TFT. Builds the full production UI — RPM arc, speed, boost bar, temperature grid — on fake data so the layout is nailed before CAN hardware arrives.

v0.4

Pending

3.2" ILI9488 TFT (SPI) · Bluetooth ELM327

Combines the full-resolution TFT UI from v0.3 with live OBD2 data streamed wirelessly from a Bluetooth ELM327 dongle. Last phase before switching from ELM327 to direct CAN bus.

Full roadmap

Version Description Status
v0.1 Fake animated data on 0.96" OLED Done
v0.2 Real OBD2 data via Bluetooth ELM327 on OLED Waiting on parts
v0.3 Full UI on 3.2" ILI9488 TFT with fake data Waiting on parts
v0.4 Real OBD2 data (Bluetooth ELM327) on ILI9488 TFT Pending
v1.0 Switch to direct CAN bus via MCP2515 Pending
v1.1 Hardwired install in car (CAN tap + fuse box power) Pending
v2.0 OTA firmware updates, companion app Future

Full roadmap with commentary →

Documentation

Reference

OBD2 PID Reference

Standard and extended PIDs, CAN bus message IDs, and baud rate for BMW E81 N47 DDE7.0.

v0.1 · v0.2

Wiring — OLED Display

SSD1306 OLED connections for v0.1, plus Bluetooth ELM327 pairing for v0.2 (no USB adapter needed).

v0.3 · v0.4

Wiring — ILI9488 3.2" TFT

ILI9488 SPI pin map, library setup, and driver-chip warnings for v0.3 and v0.4.

v1.0 · v1.1

Wiring — Direct CAN Bus (MCP2515)

MCP2515 + TJA1050 CAN controller wiring, T-tap installation, and MP1584 buck converter power for v1.0 hardwired install.

v2.0

OTA Firmware Updates

HTTP-based over-the-air firmware update architecture for ESP32 once the device is hardwired to the car (v2.0).