Vitruve Encoder (older model) overview
What the older Vitruve linear encoder (LPT) measures, its technical specifications, battery and charging, and its accessories.
The Vitruve Encoder is the model that came before Vitruve Force. It is also called the Vitruve LPT (linear position transducer). It still works with the current Vitruve app for velocity-based training (VBT). It does not support jump workouts or Realtime Monitor, which need Vitruve Force.
What a linear encoder does
A linear encoder, or linear position transducer, combines an optical encoder, which measures angular movement, with a coil that converts it into linear movement. This lets it measure precisely how far and how fast the string, and whatever it is attached to, moves in a straight line.
From that movement, the encoder gives you displacement, velocity, acceleration, and power. Coaches use these numbers to:
- Assess an athlete's current fitness without adding extra fatigue.
- Choose the right training load for the day.
- Manage fatigue and help reduce injury risk.
How each metric is calculated is explained in Encoder reliability and calculated metrics.
Technical specifications
| Feature | Vitruve Encoder (older model) |
|---|---|
| Dimensions | 2.99 × 2.8 × 3.5 in |
| Weight | 12 oz (365 g) |
| Screen | OLED |
| String length | 120 in (about 3 m) |
| Sampling frequency | 100 Hz |
| Minimum velocity registered | 0.08 m/s |
| Maximum velocity registered | 6 m/s (published spec sheet) |
| Charging port | Micro USB (type B) |
| Battery | 3000 mAh, up to 25 hours |
| Wireless | Bluetooth Low Energy, or Wi-Fi |
| Magnets | Six rounded magnets on the bottom |
Vitruve's Force materials describe the previous encoder's practical maximum as about 3 m/s, while this spec sheet lists 6 m/s. For very fast movements, such as jumps or throws, use Vitruve Force.
Charging
The encoder has a micro USB (type B) connector. Its cable connects to a computer or to a 5 V power adapter.
A red LED next to the connector flashes while the encoder charges. A full charge takes about 2 hours.
Bluetooth or Wi-Fi
The encoder can connect over Bluetooth Low Energy or Wi-Fi. Always use Bluetooth. The current Vitruve app connects to encoders over Bluetooth only, so keep the encoder in Bluetooth mode.
Wi-Fi mode was used by older setups, and its password is 123456789. If the encoder is in Wi-Fi mode by mistake, it will not appear in the app's device list. Switch it back to Bluetooth.
Magnets
Six rounded magnets on the bottom hold the encoder to any magnetic metal surface, such as plates or a rack. See Connect and place your encoder.
Accessories
| Accessory | Included | Notes |
|---|---|---|
| Velcro strap | Yes | The most secure way to attach the string to a barbell. |
| Neoprene bag | Yes | For carrying and storing the encoder. |
| Roller hook | No | Not recommended for Olympic lifts or deadlifts. |
| Smartphone mount | No | Holds your phone while you train. |
Accessories for Vitruve Force are listed in Accessories and merch.
Next steps
Troubleshooting
Work through a time that did not register, phantom times, a node that stops reporting, indoor interference, and times that seem inconsistent.
Connect and place
Put the encoder in Bluetooth mode, pair it with the app, fix it to a safe magnetic spot, and run several encoders on one tablet.