AMU Library

Introduction

The AMU (Aerospace Measurement Unit) Library provides a comprehensive C/C++ interface for communicating with AMU hardware devices over I2C and USB interfaces. This library is Arduino-compatible and includes extensive SCPI (Standard Commands for Programmable Instruments) command support for precise measurement and control operations.

Key Features

• Dual Interface Support: Both I2C and USB communication
• SCPI Compliance: Standard instrument control protocol
• Arduino Compatible: Easy integration with Arduino projects
• Comprehensive Measurements: Voltage, current, temperature, sun sensor data
• I-V Sweep Capability: Solar cell characterization functions
• Calibration Support: Built-in calibration routines with EEPROM storage
• Auxiliary Functions: DAC output, heater control, LED patterns

Getting Started

Installation

1. Download the library from the repository
2. For Arduino IDE: Install as ZIP library
3. For PlatformIO: Add to lib_deps in platformio.ini

Basic Usage

#include <Wire.h>
#include <amulib.h>
 
AMU amu;
 
void setup() {
    Serial.begin(115200);
    Wire.begin();
    Wire.setClock(400000);
    
    // Initialize AMU device at I2C address 0x0B
    amu.begin(0x0B);
    
    // Wait for device to be ready
    if (amu.waitUntilReady(5000) == 0) {
        Serial.println("AMU device ready!");
    }
}
 
void loop() {
    // Read measurements
    float voltage = amu.measureVoltage();
    float current = amu.measureCurrent();
    float temp = amu.measureTSensor();
    
    Serial.printf("V: %.3f V, I: %.6f A, T: %.1f C\n", 
                  voltage, current, temp);
    
    delay(1000);
}

Documentation Sections

• C++ API Reference - Library function documentation
• Interface Commands - I2C and SCPI command reference
• Code Examples - Code examples and tutorials
  
• Hardware Reference - AMU hardware specifications

SCPI Command Overview

The AMU supports over 100 SCPI commands organized into functional groups:

System Commands

• Device identification and status
• LED control and patterns
• Sleep mode and power management
• I2C configuration
• Firmware information

Measurement Commands

• Voltage and current measurements
• Multi-channel temperature sensing
• Sun sensor angle calculations
• Internal voltage monitoring
• Pressure sensor data

Calibration Commands

• ADC calibration procedures
• DAC calibration
• Temperature sensor calibration
• EEPROM storage of calibration data

I-V Sweep Commands

• Solar cell characterization
• Configurable sweep parameters
• Data storage and retrieval
• Voc and Isc measurements

Compatibility

• Arduino: Uno, Nano, ESP32, ESP8266, and compatible boards
• PlatformIO: All supported platforms
• Interfaces: I2C (400kHz), USB Serial
• Voltage: 3.3V and 5V logic compatible

License

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

Author

Colin Mann - The Aerospace Corporation

Version

2.1

Date

2025