AI Agent Use Cases
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Prompt to Prepare a Shopping Cart from a Recipe Photo

The author reports that Grok Bot receives a recipe photo, organizes the ingredients and quantities, and creates a shopping list by excluding ingredients already available at home.

Grok Bot
Life & Hobbies

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Life & Hobbies

Turning an Old Unused Phone into an Offline Speedometer

To make a prepaid phone sitting in a drawer useful, the author reports creating a speedometer app that works without internet, using just one prompt.

ChatGPT

How it works

  1. The author decided to repurpose an unused phone as an offline digital speedometer.
  2. They set GPT-6 Astra to high and had it create the app with a single prompt.
  3. They tested it in a car, comparing the app's reading to the dashboard needle to check accuracy.

Results

The author reports that making the app took 46 minutes and 11 seconds, and the speed matched the dashboard needle within 3 km/h.

Notes

The article does not specify which prompt was used, or whether it was in the ChatGPT app or another interface like Codex.

Source

Reddit Original post ↗

Example prompt · ChatGPT

Please create an app that allows an old unused phone to be used as a digital speedometer without internet.

Input: Phone model and OS version [e.g., Android version], installation method [direct install file/store], display unit [km/h], screen orientation [landscape/portrait]. First, check if this model can receive GPS speed values without internet and what location permissions are needed, and let me know.

Create a simple screen that displays the GPS speed value in large numbers, and when the signal is weak or the location is not yet acquired, show a waiting status instead of numbers. Use a short average to prevent the value from jumping, but adjust so the response is not too slow. Include an option to keep the screen from turning off and a dark mode for night use. Do not request internet permissions, and do not save location history.

To prevent handling the phone while driving, make the speed appear as soon as the app is launched, and add a notice that settings can only be changed while stopped.

Deliverables: installation file, installation instructions, and a verification checklist. First, compare the speed with a map app at slow speeds like walking and cycling, then have a passenger record the difference with the vehicle's dashboard to check the error.