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.

This small update 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.

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.

1.14.2 Fixes crashes when WiFi is disabled Here are the 1.14 release notes: Improved element and wire selection. New elements: * RGB Led * 74HC4551 Analog Multiplexer and Demultiplexer * Custom Element New capabilities: * Added the capability to create Custom Elements in an Arduino like way * Added the capability to add resistors, inductors and capacitors to the Custom Elements * Added the capability to use SPI bus with Custom elements * Added the capability to draw shapes over the chip and create animations using the drawing functions in the Custom Elements * Added the capability to save persistan data through an EEPROM with the Custom Elements * Added the capability of login to the Gallery directly into the application * Upload Custom Elements to the Gallery directly from the application * Create and upload Custom Element revisions directly to the Gallery * Pull Custom Element revisions from the Gallery directly into the application Custom Elements: Fixes: * SPI disconnections when a modification * I2C disconnections when a modification

1.14.1 Fixes parallel capacitors. Here are the 1.14 release notes: Improved element and wire selection. New elements: * RGB Led * 74HC4551 Analog Multiplexer and Demultiplexer * Custom Element New capabilities: * Added the capability to create Custom Elements in an Arduino like way * Added the capability to add resistors, inductors and capacitors to the Custom Elements * Added the capability to use SPI bus with Custom elements * Added the capability to draw shapes over the chip and create animations using the drawing functions in the Custom Elements * Added the capability to save persistan data through an EEPROM with the Custom Elements * Added the capability of login to the Gallery directly into the application * Upload Custom Elements to the Gallery directly from the application * Create and upload Custom Element revisions directly to the Gallery * Pull Custom Element revisions from the Gallery directly into the application Custom Elements: Fixes: * SPI disconnections when a modification * I2C disconnections when a modification

Improved element and wire selection. New elements: * RGB Led * 74HC4551 Analog Multiplexer and Demultiplexer * Custom Element New capabilities: * Added the capability to create Custom Elements in an Arduino like way * Added the capability to add resistors, inductors and capacitors to the Custom Elements * Added the capability to use SPI bus with Custom elements * Added the capability to draw shapes over the chip and create animations using the drawing functions in the Custom Elements * Added the capability to save persistan data through an EEPROM with the Custom Elements * Added the capability of login to the Gallery directly into the application * Upload Custom Elements to the Gallery directly from the application * Create and upload Custom Element revisions directly to the Gallery * Pull Custom Element revisions from the Gallery directly into the application Custom Elements: Fixes: * SPI disconnections when a modification * I2C disconnections when a modification

New elements: NeoPixels and NeoMatrix Keypad Optocoupler Transmission Lines Photodiode Power Supply Jack Mono (TS), Stereo (TRS) and Headphone (TRRS) Jacks PCA9685 PWM Board EEPROMs SCP1000 Pressure Sensor Strain Gauges MPU6050 Accelerometer and Gyroscope AD5204 and AD5206 Digital Potentiometers TSC7432 Color Light-To-Digital Converter New capabilities: Added the Arduino SPI library Added the Arduino NeoPixel libraries (from Adafruit) Added the Arduino EEPROM library Added the Arduino Adafruit_PWMServoDriver library Added the Arduino String library Added the Arduino Keypad library Photoresistor and Photodiode LED sensitivity Series 7400 input voltages depends on VCC Support for SPI and I2C with PIC16F877A Support for SPI with Arduino (Master mode only) Calculate light frequency and wavelength in LED infos Show Internal Ports Voltages as Wires does Persistant Arduino EEPROM memory Fixes: Fix PIC16F877A possible issues Fix Internal Port bugs Enable the Capacitor Loop warning (capacitor with no resistance)

Version 1.12.2 improves subcircuits and contains all the new features and bug fixes from the big 1.12 release: New elements: * Diac and Triac * Varactor and Memristor * 7401, 7403, 7409, 7411, 7412, 7413, 7415, 7418, 7419, 7420, 7421, 7422, 7424, 7425, 7426, 7427, 7428, 7433, 7434, 7435, 7436, 7439, 7442, 7443, 7444, 7447, 7449, 7450, 7451, 74L51, 7453, 74H53, 7454, 74H54, 74L54, 7455, 7456, 7457, 7458, 7460, 7464, 7465, 7470, 7471, 74H71, 7472, 7473, 7475, 7476, 7477, 7478, 74LS78, 7480, 7481, 7482, 7483, 7484, 7487, 7489, 7491, 7492, 74100, 74101, 74104, 74105, 74107A, 74108, 74109, 74110, 74112, 74113, 74114, 74116, 74118, 74125, 74126, 74128, 74131, 74132, 74133, 74134, 74135, 74136, 74138, 74139, 74140, 74170, 74224, 74244, 74245, 74540, 74541, 744067, 4006, 4008, 4009, 4010, 4012, 4013, 4014, 4015, 4016, 4018, 4019, 4020, 4021, 4022, 4023, 4024, 4025, 4026, 4027, 4028, 4030, 4031, 4032, 4038, 4040, 4041, 4042, 4043, 4044, 4049 * Servo motor * LED Matrix * Spark gap and tunneling diodes * H-Bridge (L293) * LM358 VCO * Triode and Tetrode * Internal Ports * Buffer and tristate buffer * Ten segment LED bar graph * Internal ports New capabilities: * Wire colors with controllable thickness * Over-voltage warning on ICs * Over-power ratings on resistors * Rotate command to quickly re-orient elements * Support for expressions on Resistor * Improved support for Arduino structs and arrays * Added the Arduino Servo library * Resistance, Frequency, RMS, PP, Min and Max Voltage measurement mode on Gauge Fixes: * Better contrast in the element popup editor * Dark mode and light mode can now be automatic or manual * Fix low Ohmic potentiometers * Official symbol for MOSFETs

Version 1.12.1 has bug fixes and improvements for the big 1.12 release with these new features: New elements: * Diac and Triac * Varactor and Memristor * 7401, 7403, 7409, 7411, 7412, 7413, 7415, 7418, 7419, 7420, 7421, 7422, 7424, 7425, 7426, 7427, 7428, 7433, 7434, 7435, 7436, 7439, 7442, 7443, 7444, 7447, 7449, 7450, 7451, 74L51, 7453, 74H53, 7454, 74H54, 74L54, 7455, 7456, 7457, 7458, 7460, 7464, 7465, 7470, 7471, 74H71, 7472, 7473, 7475, 7476, 7477, 7478, 74LS78, 7480, 7481, 7482, 7483, 7484, 7487, 7489, 7491, 7492, 74100, 74101, 74104, 74105, 74107A, 74108, 74109, 74110, 74112, 74113, 74114, 74116, 74118, 74125, 74126, 74128, 74131, 74132, 74133, 74134, 74135, 74136, 74138, 74139, 74140, 74170, 74224, 74244, 74245, 74540, 74541, 744067, 4006, 4008, 4009, 4010, 4012, 4013, 4014, 4015, 4016, 4018, 4019, 4020, 4021, 4022, 4023, 4024, 4025, 4026, 4027, 4028, 4030, 4031, 4032, 4038, 4040, 4041, 4042, 4043, 4044, 4049 * Servo motor * LED Matrix * Spark gap and tunneling diodes * H-Bridge (L293) * LM358 VCO * Triode and Tetrode * Internal Ports * Buffer and tristate buffer * Ten segment LED bar graph * Internal ports New capabilities: * Wire colors with controllable thickness * Over-voltage warning on ICs * Over-power ratings on resistors * Rotate command to quickly re-orient elements * Support for expressions on Resistor * Improved support for Arduino structs and arrays * Added the Arduino Servo library * Resistance, Frequency, RMS, PP, Min and Max Voltage measurement mode on Gauge Fixes: * Better contrast in the element popup editor * Dark mode and light mode can now be automatic or manual * Fix low Ohmic potentiometers * Official symbol for MOSFETs

New elements: * Diac and Triac * Varactor and Memristor * 7401, 7403, 7409, 7411, 7412, 7413, 7415, 7418, 7419, 7420, 7421, 7422, 7424, 7425, 7426, 7427, 7428, 7433, 7434, 7435, 7436, 7439, 7442, 7443, 7444, 7447, 7449, 7450, 7451, 74L51, 7453, 74H53, 7454, 74H54, 74L54, 7455, 7456, 7457, 7458, 7460, 7464, 7465, 7470, 7471, 74H71, 7472, 7473, 7475, 7476, 7477, 7478, 74LS78, 7480, 7481, 7482, 7483, 7484, 7487, 7489, 7491, 7492, 74100, 74101, 74104, 74105, 74107A, 74108, 74109, 74110, 74112, 74113, 74114, 74116, 74118, 74125, 74126, 74128, 74131, 74132, 74133, 74134, 74135, 74136, 74138, 74139, 74140, 74170, 74224, 74244, 74245, 74540, 74541, 744067, 4006, 4008, 4009, 4010, 4012, 4013, 4014, 4015, 4016, 4018, 4019, 4020, 4021, 4022, 4023, 4024, 4025, 4026, 4027, 4028, 4030, 4031, 4032, 4038, 4040, 4041, 4042, 4043, 4044, 4049 * Servo motor * LED Matrix * Spark gap and tunneling diodes * H-Bridge (L293) * LM358 VCO * Triode and Tetrode * Internal Ports * Buffer and tristate buffer * Ten segment LED bar graph * Internal ports New capabilities: * Wire colors with controllable thickness * Over-voltage warning on ICs * Over-power ratings on resistors * Rotate command to quickly re-orient elements * Support for expressions on Resistor * Improved support for Arduino structs and arrays * Added the Arduino Servo library * Resistance, Frequency, RMS, PP, Min and Max Voltage measurement mode on Gauge Fixes: * Better contrast in the element popup editor * Dark mode and light mode can now be automatic or manual * Fix low Ohmic potentiometers * Official symbol for MOSFETs

• Fix relays and other complex elements when used in subcircuits • Add IEC capacitor symbols • Add 3.3 V Arduino option • Add support for `sizeof`, `continue`, and `break` in C code • Improve the scope stats to update more regularly • Fix the alignment of the SPDT switch when rotated • Fix lasso tool when using Apple Pencils

• Fix the Export menu on iPads • Choose circuit themes independently of dark/light mode of iOS • Add an async reset option to JK flip-flops • Add RS flip flops • Make relays act more ideally by default • Add optional rail ports to Op-amps • Add circuit "lock" to prevent edits if desired • Add Gallery to download user-submitted circuits

• Automatically uses light or dark mode in iOS 13 • New Flip command to quickly flip elements • Long-press to edit element properties that can be dismissed with a flick on iPhone • New DPST and DPDT switches • Common anode mode for the 7-segment display • Fixes the simulation of nested subcircuits • 555 now has ground by default • Pin numbers on ICs • Lots of other fixes!

* NEW! Frequency measurement mode in the Scope display the Fourier transform of any signal so that you can design AC filters and monitor other repeating behaviors of your circuit * NEW! Delete tool to make cleaning up circuits easier * All new drawing code to make circuit animations smoother than ever * More accurate scope with thinner lines and higher sampling rate * New circuit browser to make sharing files with other apps easier * Many bug fixes and and other improvements

* Fixes saving circuits * Fixes gauges that would not update * Fixes selecting multiple elements on iPhone X

* Fixes dragging items after editing them (missing wires, etc.) * Fixes small capacitor simulation * Fixes crash when using the Microphone * Other bug fixes and improvements

Arduino support for: * Serial.println * Floating point numbers * Syntax coloring in the editor

* All new *programmable* Arduino element (only basic programming is supported now, more on the way!) * Added LM317 and Fuse elements * Updated for iPhone X

* Fixes a bug with the bottom toolbar disappearing Previous changes: * Optimized for iOS 9 and iPad Pros * New 3D Touch preview of circuits * New dark theme

* Optimized for iOS 9 and iPad Pros * New 3D Touch preview of circuits * New dark theme

• Fix iOS 9 crashes • Fix creating folders and sharing circuits • Added a Scope option to disable automatically adding the selected element to the scope

• Fix crashes when editing values on the iPad • Fix crashes with iCloud • Fix crashes when exporting (sharing) From the previous release notes: • Addition of in-circuit gauges to always have measurements on the screen • Addition of 6 CMOS ICs (4000, 4001, 4002, 4011, 4017, 4051, keep requesting on the uservoice!) • Improved wire selection • 64-bit support • Support for iPhone 6 and 6 Plus

• Addition of in-circuit gauges to always have measurements on the screen • Addition of 6 CMOS ICs (4000, 4001, 4002, 4011, 4017, 4051, keep requesting on the uservoice!) • Improved wire selection • 64-bit support • Support for iPhone 6 and 6 Plus

• Move circuits from one storage location to another • Duplicate, move, and delete folders • Always show pinned tracks in the scope • Many bug fixes and improvements from version 1.7 Updating may duplicate some of your circuits.