Build with vehicle data.

A telemetry unit in ~15 lines

AutoTLM Core is the open-source Arduino C++ library at the heart of the platform — live now on GitHub, MIT-licensed, and the piece you can use today. It reads a car over OBD-II/CAN, pulls fault codes and the VIN, enumerates every module like a scan tool, folds in onboard GNSS + IMU, and pushes a clean telemetry frame to a server you own. Works in the Arduino IDE and PlatformIO.

#include <AutoTLM.h>
AutoTLM car;

void setup() {
  car.begin();                                  // OBD + GNSS + IMU up
  car.wifi("MyHotspot", "password");
  car.cloud("http://yourserver.com/api/ingest", "TOKEN");
  car.onDTC([](const char* code){ Serial.println(code); });
}

void loop() {
  car.update();                                 // pump sensors + push
  if (car.obd().connected()) Serial.println(car.obd().rpm());
}

AutoTLM Studio

A free Windows cockpit with a built-in simulated car — you don't need any hardware to start. Pick a drive scenario, pin any signal to a value, inject fault codes and watch the CHECK ENGINE light and freeze-frame behave exactly like a real vehicle, then read the decoded OBD-II traffic line by line and export it to CSV/JSON.

Everything that snaps together

One platform, built in the open, as pieces you can adopt one at a time.

Two devices, one open idea

The library runs on off-the-shelf ESP32 gear today; the AutoTLM hardware is what we're building next. Two distinct products — one you program, one you develop against — and neither is a locked, subscription-only black box.

AutoTLM One · open dev dongle

Your car. Your code.

An in-car OBD-II dongle you program yourself in the Arduino IDE — OBD-II, GNSS, IMU and WiFi push, all yours to script.

Car-Emulator · bench appliance

A car on your desk.

A sealed appliance that answers OBD-II like a real vehicle — simulated drives, signals, fault codes and a multi-frame VIN — so you build and test without a car.

Hardware is in development — not yet purchasable, and no prices have been announced.

Live gauges & CarPlay

The AutoTLM iPhone app puts live gauges, your route and trip replay, and plain-English fault decode in your pocket — and reads the car straight over Bluetooth at about four updates a second when there's no signal at all, then hands back to the cloud when you're in range. Five pinned gauges, your trip and your fault codes ride on Apple CarPlay. It's in closed beta on iPhone — CarPlay is simulator-tested so far, and there's no public download yet.