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LSM6DSOX FIFO watermarks should leave enough headroom for interrupt latency and bus drain time. Size the batch from the active sensor rates, then watch overrun status.
LSM6DSOX FIFO Overruns: Set the Watermark From Your Drain Time Read More
A robust BME280 forced-mode loop starts one conversion, waits for the status register’s measuring bit to clear, then reads the compensated result. Fixed delays hide oversampling-dependent timing.
BME280 Forced Mode: Wait for Conversion Instead of Reading on a Guess Read More
Arduino marked one year of UNO Q on October 8. Current documentation shows why the board differs from a conventional UNO: Debian runs beside a Zephyr-based real-time MCU.
Arduino UNO Q Turns One: Its Linux–MCU Split Is Now the Defining Feature Read More
Keep 74HC595 outputs disabled through MCU boot, define both clock lines, shift a known byte, latch it, then pull OE low.
74HC595 Outputs Glitch at Startup? Hold OE High Before Latching Data Read More
PCF8574 pins have no direction register. A pin becomes usable as an input when its output latch holds 1, and a port read also clears its interrupt condition.
PCF8574 Inputs: Write High First, Then Read the Port Read More
MCP23017 interrupt service is mostly a register-order problem: find the flagged pin in INTF before reading INTCAP or GPIO clears the condition.
MCP23017 Interrupts: Read INTF Before INTCAP Clears the Event Read More
A TCA9548A does not renumber identical I²C sensors. Its control byte connects selected downstream branches, and reset returns every channel to off.
TCA9548A Channel Selection: One Control Byte Is the Difference Between Sensors Read More
BMP390 altitude is calculated from a pressure ratio, so a stale sea-level reference can move the reported height while the raw sensor pressure remains stable.
BMP390 Altitude Drift: Calibrate Sea-Level Pressure Before Blaming the Sensor Read More
An MCP3008 code is a ratio to VREF, not an absolute voltage. Use 1024 code intervals, preserve the reference value and do not mistake the top code for VREF itself.
MCP3008 ADC Codes: Convert Readings With the Voltage You Actually Reference Read More
An I²C scanner proves that something acknowledged at 0x76 or 0x77; it does not prove the device is a BME280. Read chip-ID register 0xD0 and expect 0x60.
BME280 Found on I²C but begin() Fails: Read 0xD0 Before Rewiring Read More