# Give your lifting sensor a voice coach

A weightlifting sensor reports each rep’s velocity through a custom Bluetooth bridge.

## Hardware
ADR Encoder

An ADR Encoder measures the motion of a lift and passes velocity readings to a Mac over Bluetooth, where a voice interface can discuss the current set.

## Shopping list

Parts for one build. Reuse equipment you already own. Quantities are planning quantities unless the creator explicitly specifies a count; kit contents are not additional purchases.

Quantities are for one build. Unless marked source-specified, they are planning quantities; confirm kit contents and the chosen configuration before ordering.

### Confirm before buying
- Creator does not identify the encoder firmware or publish a complete Bluetooth implementation; confirm compatibility before purchasing for this project.

### 1 × ADR Encoder
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Measure bar velocity.
- Destination: https://adrencoder.com/en/linear-position-transducer-vbt?SubmitCurrency=1&id_currency=8
- Match: Exact product family; firmware not disclosed
- Link review: Page checked; stock not assessed
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-36218fe62a49fbc58d46d778c8c1b9e69b25f97cf607dcbc1fe63564b59dd8a2
- Source: https://x.com/i/status/2111585421838754295

### 1 × Mac with Bluetooth
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Receive readings and run voice coaching.
- Sourcing: No exact purchase link verified; confirm the model and requirements above before ordering.
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-36218fe62a49fbc58d46d778c8c1b9e69b25f97cf607dcbc1fe63564b59dd8a2
- Source: https://x.com/i/status/2111585421838754295

### Kit contents × Encoder attachment system, charger and charging cable
- Requirement: Included
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Mount and charge the sensor.
- Notes: Manufacturer lists an attachment system, carry case, power cable and charger; check the purchased package.
- Sourcing: Built in or supplied with the stated device; check package contents before buying separately.
- Evidence: Creator source
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-36218fe62a49fbc58d46d778c8c1b9e69b25f97cf607dcbc1fe63564b59dd8a2
- Source: https://x.com/i/status/2111585421838754295

### Existing setup × Training equipment and secure sensor attachment
- Requirement: Required
- Quantity basis: Planning quantity for one build; check the selected configuration
- Purpose: Perform the measured exercise.
- Notes: Attach according to the encoder instructions; coaching output is not an independently validated training prescription.
- Sourcing: Use existing equipment or match the specification above. No exact purchase link verified.
- Evidence: Setup requirement — check against your configuration
- Source: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-36218fe62a49fbc58d46d778c8c1b9e69b25f97cf607dcbc1fe63564b59dd8a2
- Source: https://x.com/i/status/2111585421838754295

Source reviewed, not assembled or hands-on tested. A working product page does not confirm stock, firmware compatibility or a complete build.

## Setup
Sensor workflow

## Coding tool
Codex

## How the agent helped
The creator says Codex built the command-line bridge that reads measurements from the sensor. This is evidence of a custom hardware integration, not a validation of its coaching advice.

## Before you build
Uses a Mac and Codex Voice. Sensor integration is documented; training recommendations are not independently validated.

## Sources
- Original build: https://youcanjustbuildthings.openai.chatgpt.site/projects/submission-36218fe62a49fbc58d46d778c8c1b9e69b25f97cf607dcbc1fe63564b59dd8a2
- Supporting source: https://x.com/i/status/2111585421838754295

Source reviewed 2026-11-04. Not hands-on tested.