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Ccircuitrockscircuitrocks.hashnode.devSep 4 · 3 min read

Raspberry Pi Bootloader Now Draws Splash Screens on SPI Panels

Cyberdecks quietly changed what a Raspberry Pi is allowed to look like. Handhelds such as the M5Stack Cardputer Zero and the Hackberry Pi ship with a small SPI panel bolted on as the only display, wit

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Ccircuitrockscircuitrocks.hashnode.devAug 29 · 3 min read

Never Buy the Same L298N Twice: An Arduino UNO Q Parts Tracker

You need one L298N dual H-bridge to spin a motor. A pack of 5 costs barely more than a single module, so you buy the pack, use one, and drop the rest in the parts bin. Do that three times and suddenly

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Ccircuitrockscircuitrocks.hashnode.devAug 28 · 3 min read

Build a Digital Nose: an SGP30 Sensor That Sniffs Out Spoiled Milk

A carton of milk that smells fine to one person can smell off to another, and if a cold has knocked out your nose entirely you get no vote at all. Adafruit's freshness checker turns that judgment call

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Ccircuitrockscircuitrocks.hashnode.devAug 5 · 2 min read

This Giant 16×2 Character Display Runs on an RP2040 and 1,000 LEDs

What do you get when you rebuild a pocket-sized 16×2 character LCD at seven times scale? Over a thousand addressable LEDs, a stack of custom PCBs, and a display you can read from across the room. Make

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Ccircuitrockscircuitrocks.hashnode.devJul 25 · 2 min read

A Raspberry Pi Zero Clock That Sets Itself and Never Drifts

Ask any electronics hobbyist about their most over-built weekend project and a clock almost always comes up. Seven-segment displays, real-time clock chips, GPS sync, WiFi-fed NTP: the humble desk cloc

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Ccircuitrockscircuitrocks.hashnode.devJul 22 · 2 min read

An ESP32 and Eight ToF Sensors Give This Antique Lamp a Sixth Sense

What if a floor lamp could feel you crossing the room and answer with light and sound?That is the trick behind Bloom Chandelier, an interactive installation built around a brass floor lamp handed down

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SBSomnath Babu N Rbeyondbits.hashnode.devJun 18 · 5 min read

Understanding I²C From a Engineer's Perspective

Embedded Systems Fundamentals #3 If SPI is the protocol of speed, Inter-Integrated Circuit (I²C )is the protocol of simplicity. You'll find I²C everywhere: Temperature sensors Accelerometers PMICs

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EAElectroscope Archiveelectroscopearchive.hashnode.devFeb 9 · 3 min read

🚀 Mastering PCA9306 I²C Level Shifting with Arduino UNO

Introduction When working with mixed-voltage embedded systems, mismatched logic levels can damage sensors or cause communication failures. The PCA9306 bidirectional level shifter module solves this problem by enabling seamless I²C communication betwe...

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Aampheoampheoelectronic.hashnode.devJan 6 · 4 min read

How to organize microcontroller data?

Organizing microcontroller data is mostly about making it predictable, safe across interrupts, and maintainable as firmware evolves. A good approach is to split data by lifetime + purpose, then choose the right structure/format for each layer. 1) Fir...

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박박서경psk-study.hashnode.devNov 6, 2025 · 3 min read

I2C (Inter-Integrated Circuit)

📘 I2C (Inter-Integrated Circuit) 1) Concept I2C is a two-wire serial communication bus used to connect multiple devices. It is commonly used for sensors, EEPROMs, PMICs, RTCs, touch controllers, and other low-speed peripherals. SPI: faster, requires...

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Trending tags this week

Raspberry Pi Bootloader Now Draws Splash Screens on SPI Panels

Never Buy the Same L298N Twice: An Arduino UNO Q Parts Tracker

Build a Digital Nose: an SGP30 Sensor That Sniffs Out Spoiled Milk

This Giant 16×2 Character Display Runs on an RP2040 and 1,000 LEDs

A Raspberry Pi Zero Clock That Sets Itself and Never Drifts

An ESP32 and Eight ToF Sensors Give This Antique Lamp a Sixth Sense

Understanding I²C From a Engineer's Perspective

🚀 Mastering PCA9306 I²C Level Shifting with Arduino UNO

How to organize microcontroller data?

I2C (Inter-Integrated Circuit)