AT21CS01 Arduino Library

An Arduino library for interfacing with the AT21CS01 1-Wire EEPROM, providing reliable communication and memory operations.

Features

• Custom one-wire protocol implementation specific to AT21CS01
• Support for both Standard and High-Speed communication modes
• Complete memory read/write operations
• Device address scanning
• Manufacturer ID access
• CRC error checking

Hardware Setup

• Connect AT21CS01 SI/O pin to GPIO (configured as open-drain)
• Use 2.1kΩ pull-up resistor between SI/O and 3.3V
• Connect AT21CS01 GND to system ground

Installation

1. Download this repository
2. In Arduino IDE: Sketch -> Include Library -> Add .ZIP Library
3. Select the downloaded ZIP file

Usage

#include "AT21CS01.h"

AT21CS01 eeprom(13);  // Connect SI/O to GPIO 13

void setup() {
  Serial.begin(115200);
  
  // Reset device
  if(eeprom.reset() == 0x00) {
    Serial.println("Device found!");
  }
}

Examples

• EEPROM_Basic_Test: Basic read/write operations
• Load_Cell_Calibration: Example for storing calibration data

Development History

This library was developed during an internship at #S Fabrication Company (Dankotuwa, Sri Lanka) for storing load cell calibration data. The implementation is based on studying the Dallas Semiconductor One-Wire protocol and adapting it to meet AT21CS01's specific requirements.

All timing parameters have been verified using oscilloscope measurements to ensure compliance with the AT21CS01 datasheet specifications.

License

This project is released under the MIT License. See the LICENSE file for details.

Author

Sachintha Gayajith

Acknowledgments

• Based on principles from Dallas Semiconductor One-Wire protocol
• Developed during internship at #S Fabrication Company
• Tested with ESP32 microcontroller platform .

Hardware Setup

• Connect AT21CS01 data pin to GPIO 13 in ESP32.
• Use Rpull as 2.1k resistor.
• Connect VCC to 3.3V and GND to GND.
• Verify timing with an oscilloscope if needed.