Adafruit PyRuler - Engineer Reference Ruler with CircuitPython

The first time you soldered a surface mount component, you might have been struck by their tiny size. With a plethora of mysterious names like QFN, TDFN, SOIC, and SOP, deciphering these can be daunting. Now, the handy PCB reference ruler puts a plethora of information at your fingertips. It includes dimensions for the most common component packages, a font size guide, trace-width diagram, and a set of schematic symbol guides.

Embedded with a fully featured Trinket M0 microcontroller, this ruler isn't just a static tool; it's an interactive engineering aid. It features capacitive touch pads linked to LEDs, instantly producing Ω, µ, or π symbols—ideal for engineers who can't memorize complex key-commands. Powered by CircuitPython, your creations move with you; just edit code.py from your chosen text editor, and it's compatible with any computer, including Chromebooks.

Advanced users will appreciate the ATSAMD21E18 32-bit Cortex M0+ processor with 256KB Flash, 32 KB RAM. Native USB support ensures seamless integration with Arduino IDE or CircuitPython, transforming the ruler into a USB serial console or a keyboard/mouse HID. With extra capabilities like 5 GPIO header pins, 3 ADCs, and hardware support for SPI, I2C, and Serial, this tool’s versatility shines. Additionally, the ruler can drive NeoPixels, and the available Surface Pro SPI and I2C channels mean fewer headaches with bit-banging communications.

Imagine not just a simple ruler but a gateway to learn and execute engineering projects anywhere. With power options via USB or external battery, it’s adaptable for your unique needs. Whether starting afresh with a reset switch or exploring the keyed Digi-Key logo for special guides, the opportunities with this ruler are vast and creative.