TM-01

Context

A wrist device for ADHD time management: one knob, 24 LEDs, haptic feedback, no screen.

Final BSc project at PoliMi, designed it solo end to end, from research to the hardware and the companion app.

Team

2025

TM-01 wristband with an orange strap and a brushed metal display with a slider
The problem

For people with ADHD, time is invisible

Time blindness, forgetfulness and constant distraction make it hard to estimate, plan and keep track of time. Most people I interviewed weren't happy with how they manage it, and their main tool, the phone, adds to the noise.

Three design challenges

Interviews showed people already rely on Pomodoro timers, alarms and fidget toys.

Encourage its use

Refined enough to keep on.

Limit distractions

Subtle feedback, no phone.

Overcome social stigma

No medical look.

Solution

Three functions, one knob

Pomodoro, Reminder and Timer: the tools people already rely on, moved off the phone and onto the wrist. Works without a phone.

TM-01 in the dark, its display lit in warm yellow and the LED strip glowing
A flat, grey synthesizer with round knobs and a small colour screen
Close-up of perforated grey aluminium with a polished tube
A glossy yellow tote bag with black straps, hanging from a hook
A person in a white suit walking barefoot on dark rock under a grey sky
Two black wheels with exposed ball bearings joined by a black strap

Interface and interactions

Slide the knob to switch function, press to choose. Every action is confirmed by a vibration. The LEDs turn off after 3 seconds and wake when you raise your wrist.

Companion app

The app personalises settings, syncs reminders with the calendar and shows stats. The device works fully without it.

Onboarding

Onboarding screen: the TM-01 device, with sign-in through Apple, Google or Facebook

Timer

Pomodoro

Profile and stats

The profile saves settings and history. Weekly stats show how the device is used, like 34 Pomodoros in a week.

Profile

Stats

Features

Device, interchangeable straps, charging base.

Interchangeable strap

Subtle feedback

Long battery life

170 mAh

About 4 days on a charge

LED strip

Companion app

Made for everyday life

The TM-01 wristband, with its brushed metal display and slider

Designed for ADHD

Bluetooth connection

Knob

Compact size

22 × 44 × 9 mm

Charging dock

Timer

Reminder

Pomodoro

Personalisation

Silicone, leather and fabric straps. No medical look.

TM-01 with a orange silicone strap
TM-01 with a brown leather strap
TM-01 with a light grey silicone strap
TM-01 with a rust fabric strap
TM-01 with a black silicone strap
TM-01 with a grey fabric strap
TM-01 with a black fabric strap

Engineering

Haptic motor against the wrist. Battery split in two around the knob. Held together by the shell geometry and three screws.

Exploded view of TM-01: aluminium body, LED board with diffuser, dome switch, two 95 mAh LiPo batteries, main and auxiliary boards, pogo-pin board, Bluetooth antenna, vibration motor and plastic bottom shell
Exploded view of the charging dock: plastic cover, pogo-pin board, USB-C connector, battery, metal base, rubber feet and screws
TM-01 with a transparent shell, showing the LED strip, the two batteries and the knob mechanism inside

Body: anodized aluminium, milled. Shell: PP, injection-moulded. Knob: stainless steel, ball bearing, magnetic encoder. Base: die-cast aluminium, USB-C, pogo pins.

This is a student concept inspired by Teenage Engineering. It is not affiliated with, sponsored by, or endorsed by Teenage Engineering.