iCircuit 1.16 is the biggest update in years: real SPICE subcircuits, Verilog and VHDL simulation, and fully emulated Raspberry Pi Pico boards running genuine MicroPython and CircuitPython, all in the same real-time simulator you already know.

RASPBERRY PI PICO & PICO 2, FULLY EMULATED
Drop a Raspberry Pi Pico or Pico 2 into your circuit and write Python! iCircuit boots real MicroPython 1.28 and CircuitPython 10.2 firmware on machine-level emulations of the RP2040 and RP2350 processors, your choice of firmware per board.
• Write Python right in the app: syntax-highlighted editor with edit-time error checking and multi-file projects
• Interactive serial console with a Serial Plotter running alongside
• Real tracebacks with actual file and line numbers, just like on hardware
• GPIO, PWM, ADC, and I2C/SPI/UART buses interact with the rest of your circuit in real time
• Labeled pin roles, on-board LED, and effective emulated clock speed in the info panel

SPICE SUBCIRCUITS
Import industry-standard SPICE models and use them as first-class circuit elements:
• Transistors and diodes with .MODEL cards: BJTs, MOSFETs, and multi-emitter BJTs
• All dependent sources (E, F, G, H) and independent V/I sources with standard waveforms
• Nested subcircuits with parameters
• Coupled inductors (K mutual inductance)
• .INCLUDE, .IC, and .TEMP directives, with graceful handling of analysis commands
• Robust, case-insensitive parsing with clear error messages
Grab a vendor's SPICE model off the web and simulate it right in iCircuit.

VERILOG AND VHDL
The new HDL element compiles and simulates synthesizable Verilog and VHDL in real time. Design a counter, a state machine, or glue logic in the language you use at work or school, wire it to LEDs, switches, and the rest of your analog circuit, and watch it run.

NEW ELEMENTS
• I2C sensors: HDC1080 humidity, MLX90614 IR thermometer, DS1307/DS3231 real-time clocks, ADS1115 16-bit ADC, readable straight from Python
• AC Current Source, On-Off-On Switch, multiple-emitter BJTs, and OB2512RN offline PSR power switch
• 74138, 74139, 7483, 74107, and 74245 added to the Standard set
• Better power jacks and TRS jacks

ARDUINO
• Drive SSD1306 OLED displays with the Adafruit_SSD1306 and Adafruit_GFX libraries
• Keep sketches in external script files and share them between circuits
• Export sketches to use on real hardware
• Configurable console size and plotting from your sketch

EDITOR AND ANALYSIS (iPhone, iPad, and Mac)
• Rectangular selection
• Disconnect an element without deleting wires by hand
• The canvas grows automatically when you drop elements near the edge
• Color-code wires and elements
• Help text for every property in the Inspector
• Assign keys to momentary switches and play your circuit like an instrument
• XY scope mode for Lissajous figures and I/V curves
• FFT export
• Parts List (BOM) export as CSV, compatible with EasyEDA/JLCPCB part search

BUG FIXES
• Fixed inverter values when exporting, a crash in net labeling, and custom IC drawing clipping
• More accurate component power warnings
• More realistic I2C and SPI bus behavior
• Many SPICE, HDL, and simulation correctness fixes, validated by 775 automated circuit tests

SMOOTHER EDITING
• Redo is one long-press away: just hold the Undo button
• Apple Pencil now works everywhere your finger does

Thank you for your continued support! Whether you're learning electronics, teaching a class, prototyping a product, or just having fun, we hope v1.16 makes iCircuit more useful than ever.

This small update fixes signing into the iCircuit Gallery to upload custom elements and fixes the link to the iCircuit Manual.

1.15.1: Fixes the lasso selection tool, fixes crashes on iOS 12 devices, fixes thumbnail generation, and it fixes the D12 port label on Arduino Nanos

# Version 1.5 Updates

This major update brings powerful new analysis tools, expanded microcontroller support, and numerous improvements.

## Bode Plot Analysis

Unlock frequency response analysis with new Bode plot capabilities! Visualize how your circuits respond across frequencies with magnitude and phase plots. Perfect for analyzing filters, amplifiers, and frequency-dependent circuits. See cutoff frequencies, gain characteristics, and phase relationships at a glance.

## Expanded Microcontroller Support

- **Arduino Mega** - Build bigger projects with 54 digital I/O pins and 16 analog inputs
- **Arduino Nano** - Compact board ideal for small-scale applications
- **ESP32 and ESP8266** - Enhanced support for popular IoT microcontrollers

## New Circuit Elements

- **AC Motor** - Single phase AC induction motor
- **Barrel Connector** - Professional DC power jack for your circuits with configurable shunt terminal
- **Improved Power Supply Jack** with better connection handling

## Quick Search

Find circuit elements faster than ever! New search bar lets you instantly locate components without scrolling through categories. Just start typing and get to building.

## Voltage Monitoring

Protect your circuits with automatic under-voltage and over-voltage warnings. Get notified when components are operating outside their safe voltage ranges, helping prevent damage to sensitive ICs and ensuring reliable operation.

## Element Library Organization
- New Microcontroller category for better organization
- Improved element filtering options
- Elements sorted by Pro availability for easier discovery

## Bug Fixes

- Fixed photodiode and photoresistor light source selection
- Removed false capacitor loop errors that prevented valid circuits from running
- Added input voltage tolerance for digital ICs to prevent spurious warnings from minor voltage fluctuations
- Better handling of Arduino EEPROM and multiple board types

Thank you for your continued support! Whether you're learning electronics, prototyping professional designs, or just having fun building circuits, we hope v1.15 makes your experience even better.