Free tools for Arduino, ESP32, and Raspberry Pi Pico builders, by TheMakersWorkbench.com. One page, six tools, no build step and no dependencies. Type values with prefixes like 4.7k or 16M, and the answers update as you type.
| Tab | What it does |
|---|---|
| ADC | Counts to volts and volts to counts for 8 to 16 bit converters, and the size of one step. |
| ADC Divider + Code | Finds resistors to measure a higher voltage with a 3.3 V or 5 V ADC, and writes Arduino, ESP32, or MicroPython code that scales the reading back. |
| PWM | Period, on and off time, average voltage, and a starting RC filter cutoff. |
| Logic Levels | Whether two chips can talk directly, need level shifting, or could be damaged. |
| UART Baud | The divisor and error for a clock and baud rate (AVR). |
| AVR Timer | Every prescaler and compare value that reaches a target frequency on the ATmega328P timers. |
Open index.html in a browser. To serve it locally: python -m http.server in this folder.
Run the tests (Node 18 or newer, no packages needed):
node --test tests/embedded-logic.test.js
Load emb.css, js/embedded-logic.js, and js/embedded-app.js, then add:
<div class="tmwb-emb" id="tmwb-emb" data-heading="h2"></div>All styles are scoped under .tmwb-emb and sized in pixels.
drupal/tmwb_embedded_toolkit is a Drupal 10/11 module (TMWB Embedded Toolkit) that embeds the tool from a text-format filter. See its README.
index.html,emb.css: the page and stylesjs/embedded-logic.js: all the math and code generation, no DOM access, tested in Nodejs/embedded-app.js: the interfacetests/: unit testsdrupal/tmwb_embedded_toolkit/: Drupal module (runpython scripts/sync_drupal_module.pyafter changing the tool)SOURCES.md: where each formula and data table comes from
Formulas are the usual datasheet and textbook ones. The logic-level figures are typical datasheet values and differ between parts. The timer and UART tools follow the ATmega328P. Confirm anything that matters in the datasheet for your exact part.
Apache License 2.0. Free for commercial and non-commercial use. You may modify it and add to it, as long as the license, the NOTICE, and the "Developed and Maintained by TheMakersWorkbench.com" attribution stay intact.