AT24C256 I2C EEPROM Module
by Atmel / clone
SKU: PSA-CMP-AT24C256
No reviews yetTypical India street price
₹30–₹80
32 KB non-volatile memory for calibration and datalogs without SD.
Interface: I2C
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Concept
I2C EEPROM keeps bytes when power dies.
A little theory
Address 0x50 + A0–A2. Page writes 64 B; delay 5 ms after write. In the classroom, treat AT24C256 I2C EEPROM Module as a intermediate part using I2C. Typical India street price is about ₹30–₹80. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Wire.write address then data; read with repeated start.
Classroom & project use
- Store Wi-Fi creds
- Calibration
- Tiny black box
Buying in India
Precautions
- Share a common GND with the microcontroller
- Verify polarity and voltage before powering the circuit
Specifications
| Size | 256Kbit (32KB) |
| Interface | I2C |
| Category | Communication Modules |
| Difficulty | Intermediate |
| Voltage | 3.3–5V |
Pinout
VCC | GND | SCL | SDA (confirm address with I2C scanner)
