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Four Letter pHAT
Four Letter pHAT is a Raspberry Pi add-on with four 14-segment displays in a retro green LED style, driven by an HT16K33 chip over I2C. It can display text, ...
Four Letter pHAT is a Raspberry Pi add-on with four 14-segment displays in a retro green LED style, driven by an HT16K33 chip over I2C. It can display text, numbers, and a range of special characters — perfect as a readout for temperatures, times, or sensor values from boards like Enviro pHAT or Explorer pHAT.
A Python library with examples (clock, countdown timer, CPU activity monitor) is available via a one-line installer. Female header and display pins require soldering.
Key Features
- Display – 4× 14-segment green LED displays
- Driver – HT16K33 over I2C
- Compatibility – Raspberry Pi 3B+, 3, 2, B+, A+, Zero, and Zero W
- Assembly – Soldering required (female header and display pins)
Ideal For
- Displaying time, temperature, and sensor data
- Retro-style status readouts
- Raspberry Pi dashboard projects
Package Contents
- 1× Four Letter pHAT (unassembled)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- pHAT
- A smaller add-on board format for Raspberry Pi, similar in idea to a HAT but usually not full-sized. It matters because pHAT compatibility can affect how neatly a board stacks or fits into a Raspberry Pi project.
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Related Tutorials
Free guides on learn.littlebird.com.au
