# D-Drive driver assistant – Telematics for trucks and buses

> A telematics app for truck and bus drivers: alcohol tests with a Bluetooth breathalyser, GPS trip recording and an admin dashboard – used by around 80 tenants with about 2,000 users a day.

Designium Inc. · 2022 · https://www.geraldgmainer.com/en/projects/d-drive

## Context

D-Drive is a product for transport companies in Japan. Drivers take their alcohol test with a Bluetooth breathalyser, the app records the trip by GPS, and the office sees both in an admin dashboard. I built the app from scratch at Designium.

## My role

- **The whole Flutter app** – architecture, UI and implementation
- **Bluetooth communication** with external devices
- **GPS tracking** of trips with driving time and distance
- **Admin website** with React Admin
- **Supabase backend** – performance at around 2,000 users a day

## Decisions

- **The breathalyser talks straight to the app:** The breathalyser is connected over Bluetooth, and the reading is stored with the trip – no retyping, no separate form.
- **The trip is tracked live:** During the trip the app records the route by GPS and shows driving time and distance on the map – the driver ends the recording with one tap.
- **One backend for all tenants:** Around 80 companies share the same Supabase backend, with separate data per tenant. Keeping it fast at about 2,000 daily users was one of my main tasks.

## Key facts

- tenants: ~80
- users a day: ~2,000
- breathalyser connection: BLE

## Stack

Flutter, Bluetooth (BLE), GPS, Supabase, React Admin

## Links

- https://www.ubiteq.co.jp/service_product/d-drive-1