# Daily robotics puzzle: one calculation a day

> A new robotics calculation every day: voltage dividers, LED resistors, wheel speed, gear torque, battery life and stepper frequency, with instant checking.

Canonical: https://roboticsengineering.in/daily-robotics-puzzle/ | Published: 2026-11-03 | Updated: 2026-11-03

**One short calculation each day, checked instantly.** The numbers change daily and cover the maths used in real robot builds.

**Loading today puzzle…**

Your answer ()

A new puzzle appears each day in your browser. Answers are computed from the numbers, within a small tolerance.

## How it is calculated

Each day the page picks one of six problem types using the date as a seed, so everyone sees the same puzzle on the same day. The answer is computed from the numbers shown, using the same formulas as the calculators on this site.

## A worked example

Example of a type: a 5 V input with R1 = 10,000 ohm and R2 = 20,000 ohm gives 5 × 20,000 ÷ 30,000 = 3.33 V. Use the calculators to practise: voltage divider, LED resistor, wheel speed, gear train, battery runtime and stepper frequency.

## Common mistakes

- Mixing mm and metres in the wheel puzzle.
- Forgetting to convert mA to A.
- Leaving out the efficiency in the gearbox puzzle.

## Related

[LED and divider calculator](https://roboticsengineering.in/led-resistor-voltage-divider-calculator/), [wheel speed](https://roboticsengineering.in/wheel-speed-rpm-calculator/), [gear train](https://roboticsengineering.in/gear-train-calculator/), [stepper frequency](https://roboticsengineering.in/stepper-motor-step-frequency-calculator/).

Last reviewed: November 2026. This tool runs in your browser and sends nothing anywhere. Treat its output as a first check, not a guarantee.