41 circuits come with the editor. Each opens in the editor without an account; press Simulate and the firmware runs.
Boards that talk over the air, and one that flies. The radio links run through the simulated channel of the World view.
X-frame drone and a handheld remote: fly it with the sticks over a 2.4 GHz LoRa link.
Two emulated chips and the flight physics: on most computers this runs slower than real time.
AM transmitter and detector receiver in a room.
STM32 + RDA5807M: station search, RDS, sound.
Two nRF52840 nodes talk by radio with RadioOS.
Sketches with the common libraries on the Uno, Mega, Pro Micro and ATtiny85, with sensors, displays and motors around them.
Potentiometer on A0 dims the LED on D9, editable sketch.
BME280 measures, OLED displays (I²C).
Potentiometer sets the servo angle.
HC-SR04 measures; below 20 cm the relay pulls in.
DHT22 measures, I²C LCD displays.
Rotary encoder counts, TM1637 displays.
MPU6050 tilt rolls a ball on an LED matrix.
Red, yellow, green; the button shortens green.
HC-SR04 measures, five LEDs show how close.
Serial1 talks to Serial2 over a wire; 12 PWM LEDs.
Fades on in the dark, sleeps at microamps in daylight.
Zephyr and bare-metal C on the nRF52840, ESP32-C3 and STM32F411, and a NeoPixel rainbow from the RP2040’s PIO.
Platform game in C on a Cortex-M4: arrow keys and space.
A Pico W with its real Wi-Fi driver on a virtual network with router, web server and MQTT broker.
Wi-Fi, web server, switch an LED from the browser.
DHT22 values over MQTT, LED by message.
An STM32MP157 with two Cortex-A7 cores boots TF-A, U-Boot and Linux from its SD card. Log in on the serial console.
Complete STM32MP157 board, every chip a real part: boots its own Linux from the SD card.
Runs a full Linux: needs a fast computer, and the SD image (about 10 MB) loads first.
Filters, transistors, regulators and batteries: the circuits to learn the simulator with.
Battery, switch, LED: the cell discharges in time lapse.
1 kHz square wave through an RC stage (τ = 100 µs).
A square wave rings on a series resonant circuit.
Constant current for 4 × 3 power LEDs: 2 A on the board, 1.2 W per transistor.
From one CMOS gate to 8- and 16-bit computers built from 74xx chips.
Four full adder components with a carry chain.
Monitor OS with command line and game on TFT.
16-bit CPU from 74xx, draws on the TFT by itself.
