Questions about the UART, SPI & I2C poster

What’s on the UART, SPI & I2C poster?

A 5-row table: Bus · Wires · Character. Pin count is usually what settles the choice. UART — 2, plus ground — Point to point, no clock line; SPI — 4, plus one select each — Fast, full duplex, no addresses; I2C — 2, both pulled up — Addressed, many devices, slower; 1-Wire — 1, plus ground — Very slow, tolerates long runs; USB — Differential pair — Host driven, complex stack. SPI trades pins for speed and I2C trades speed for pins. Everything else about the choice usually follows from that.

Who is the UART, SPI & I2C poster for?

UART, SPI & I2C belongs to the Electrical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning embedded systems can pin it up — a beginner, a student mid-course, or someone revising years later.

When should you use the UART, SPI & I2C poster?

Choose a bus by the pins you can spare and the number of devices on it. A wall chart earns its place by being glanceable from where the work is happening, so UART, SPI & I2C belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.

What other posters go with UART, SPI & I2C?

ADC Resolution, Driving Loads and GPIO & Pull Resistors sit alongside UART, SPI & I2C in the Electrical Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.ADC ResolutionDriving LoadsGPIO & Pull Resistors

Is the UART, SPI & I2C poster free to download and print?

Yes. UART, SPI & I2C downloads as a free PDF with no account, no email and no watermark, like everything else in the Electrical Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence

What size does the UART, SPI & I2C poster print at?

UART, SPI & I2C is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of UART, SPI & I2C loses nothing.Printing guide