Spi Flash Programmer Arduino [better]

While commercial programmers (like CH341A or TL866) are cheap and effective, there is something deeply satisfying—and educational—about building your own using a microcontroller board you likely already own: the .

Do not power the flash chip from the Arduino’s 3.3V pin if it draws more than 100mA during erase/write cycles. A small chip (like W25Q32) is fine. A large chip may need an external 3.3V regulator. spi flash programmer arduino

Never connect an Arduino output pin directly to a flash chip’s input pin unless you have verified the chip’s voltage tolerance. Use a level shifter. While commercial programmers (like CH341A or TL866) are