CircuitLab | Hardware Pinouts and Electronics Calculators – Android App Template

CircuitLab is a high-performance Native Android application built for electronics engineers, hardware enthusiasts, makers, and STEM students. Engineered with battle-tested Java and responsive XML layouts, this app delivers a smooth, highly tactile dark workbench interface for rapid circuit design, interactive component decoding, and engineering calculations—functioning completely offline.

Whether you’re developing an engineering utility, a maker companion tool, or a monetized educational app, CircuitLab provides a sleek interface and robust capabilities to bring your ideas to life on the Google Play Store.

Core Engine & Architecture

• 100% Native Java & XML ViewBinding: Built with standard Android architecture, zero heavy cross-platform overhead, lightning-fast compilation, and high battery efficiency.
• Target SDK 36 (Android 16): Fully compliant with modern Google Play Store API level requirements, utilizing edge-to-edge system insets and supporting devices down to Android 7.0 (minSdk 24).
• Room SQLite Database: Reliable offline storage for calculation history with non-destructive migration architecture and JSON backup/restore capabilities in Settings.
• Secure Configuration: Zero hardcoded API keys; all AdMob IDs and credentials are safe and injected at compile time via local.properties.
• Multi-Language Localization: Fully translated into 6 major languages: English (US), Indonesian, Spanish, Japanese, German, and French.
• R8 / ProGuard Optimized: Pre-configured keep rules with code shrinking and resource optimization enabled for minimal release APK/AAB size.

App Features for Users

• Interactive Resistor Color Decoder: Instant visual resistance calculation across 4-band, 5-band, and 6-band resistors with tolerance ranges and TCR temperature coefficient.
• Dedicated Workshop Reference Tools:
  • SMD Component Code Decoder: Multi-mode decoder covering 3-digit EIA resistors, 4-digit EIA resistors, EIA-96 1% precision resistor codes, ceramic & tantalum capacitor codes, inductors, and diode/transistor package markings.
  • Wire Gauge (AWG) & E-Series Tables: Complete American Wire Gauge (AWG 0000 to 40) specifications with diameter (mm/in), cross-sectional area (mm²/kcmil), resistance (Ω/km, Ω/kft), and safe ampacity, alongside international E-Series preferred values (E6, E12, E24, E48, E96, E192).
• 12 Comprehensive Electronics Calculators:
  • Ohm’s Law & Power (Free): 4-way solver for Voltage (V), Current (I), Resistance®, and Power dissipation (P).
  • RC Filter Cutoff (Free): Low-pass and High-pass frequency cutoff (fc) and time constant (τ).
  • LED Current Limiting (Free): Recommended standard series resistance and minimum wattage rating.
  • Voltage Divider (Free): Dual-resistor divider with output voltage, divider current, and load effect.
  • Battery Life Estimator (Free): Run time in hours and days based on battery capacity (mAh), device load (mA), and discharge efficiency.
  • LC Resonant Filter (PRO): Resonant frequency (f0), reactance, and characteristic impedance (Z).
  • IC 555 Timer (PRO): Frequency, duty cycle, High/Low timings for astable and monostable multivibrator circuits.
  • Capacitor Charge & Energy (PRO): Instantaneous charging voltage Vc(t), current Ic(t), time constant τ, and stored Joules over time.
  • Op-Amp Gain (PRO): Inverting and non-inverting operational amplifier closed-loop gain (Av) and output voltage.
  • Zener Diode Regulator (PRO): Ballast series resistor (Rs) and Zener power dissipation rating (Pz).
  • PCB Trace Width (PRO): IPC-2221 compliant internal and external trace ampacity, thickness (oz/ft²), and thermal rise.
  • Wheatstone Bridge (PRO): Balanced and unbalanced bridge calculations for sensor resistance (Rx) and output voltage.
• 24 Hardware Pinout Reference Diagrams:

  Interactive custom vector canvas diagrams with color-coded pin functions, package footprints, and live search across 4 distinct categories:

  • Microcontrollers & Dev Boards (7): Raspberry Pi Pico (RP2040 DIP-40), Arduino Uno (DIP-28), Arduino Nano (DIP-30), ESP32 DevKit (DIP-30), ESP8266 NodeMCU (DIP-30), STM32 Blue Pill (DIP-40), ATtiny85 (DIP-8).
  • Analog, Timers & Power ICs (6): NE555 Timer, LM358 Dual Op-Amp, LM741 Single Op-Amp, LM386 Audio Power Amp, LM7805 +5V Regulator (TO-220), LM317 Adjustable Regulator (TO-220).
  • Digital Logic Gates (6): 7400 Quad NAND, 7404 Hex Inverter, 7408 Quad AND, 7432 Quad OR, 7486 Quad XOR, 74HC595 8-Bit Shift Register.
  • Connectors, Sensors & Modules (5): USB Type-C (Reversible 24-pin), Micro-USB Type-B (5-pin), HC-SR04 Ultrasonic Distance Sensor, DHT11 Temp & Humidity Sensor, SSD1306 0.96” OLED I2C Display.
• Calculation History: Save and review past calculation results with Room SQLite persistence, plus local JSON backup and restore capabilities in Settings.
• Tactile Dark Workbench UI: High-contrast PCB green accents, custom SI prefix units (Ω, kΩ, MΩ, mV, V, mA, A), and decimal precision controls.