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Developer tools · #arduino
On AVR-based Arduino boards, the EEPROM library provides EEPROM.write() for persisting individual bytes across resets. The underlying EEPROM cells have a finite write/erase endurance, typically specified around 100,000 cycles per byte, and reading an address does not consume that budget. For sketches that update the same address frequently—such as logging a
Memory Constraints in AVR-based Firmware Developing Arduino sketches on local simulators often masks memory limitations because simulated environments may not strictly enforce the physical SRAM boundaries of the ATmega328P. In a production environment, the 2KB SRAM limit is shared between static variables, the heap, and the stack. When scaling a project from
Problem Statement The millis() function on ATmega328P‑based boards increments a 32‑bit unsigned long based on Timer0 overflows with a 64‑prescaler. After 232 increments—roughly 49.7 days—the counter wraps back to zero. Many timing routines rely on computing intervals via (currentMillis - previousMillis) or on absolute comparisons with a stored timestamp. Unr
I am designing a retry-safe configuration store for a sketch that must run on both AVR boards and ESP32 cores. The goal is to use EEPROM.update() so that repeated attempts with identical values do not consume additional write cycles, while still handling power-loss interruption for multi-byte records. On AVR cores, update() programs the cell immediately when
A design needs a timeout and cancellation path for operations that may block, while keeping the sketch responsive and preserving RAM state across the timeout. Arduino core offers two documented mechanisms. A non-blocking millis() timer keeps the loop running and allows manual elapsed-time checks with rollover-safe unsigned arithmetic. The hardware Watchdog T