storage
2 pages across tutorials, modules, pinouts and guides.
beginnerModule
SD and microSD Card Readers for ESP32: SPI, 1-bit and 4-bit
Two 3.3 V card reader boards with the SD bus brought out in full. What the two NC pins really are, which of SPI, 1-bit and 4-bit to use, what each measured, and the wiring for all three.
beginnerModuleUpdated
EEPROM Memory
An AT24C128 I2C EEPROM on a TinkerBlock board: 16,384 bytes that keep their values with the power off, at address 0x50. VCC goes to your board's logic supply because the pull-ups end at VCC, each write takes up to 5 ms, a write wraps inside its 64-byte page, and each byte takes about a million writes.