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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, ...
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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 (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- 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
