Tools for building embedded systems

Small calculators and notes for firmware and hardware work. Each one does a single job and runs in your browser.

• Debounce calculator

  Size an RC filter for a mechanical switch, then check that the input changes only once per press.

• Voltage divider

  Find standard resistor values for a target voltage, with tolerance, current and output resistance.

• UART baud rate

  Work out the divisor for a baud rate, the rate you'll actually get, and whether the error will cause trouble.

• CAN bit timing

  Find the prescaler, time segments and sample point for a CAN bit rate, with register values for common controllers.

• Tips

  A random, practical tip for designing and building embedded systems.