Live E2E on the in-browser ESP32 engine surfaced two freezes:
- i2c.scan() stalls on the engine's I2C controller (first probed address
has no device and the transaction never completes). The bmp180 shim now
probes 0x76/0x77 directly via readfrom_mem.
- BlynkLib's blocking socket.connect() froze the demo when the second
outbound connection stalled. The vendored BlynkLib now sets a 10s
timeout before connect, and main.py catches OSError and falls back to
the offline no-op Blynk (probe-then-reconnect removed — one bounded
connection instead of two).
- 10 Pico W projects now emit boardType pi-pico-w so the RPI_PICO_W
firmware (network + CYW43) boots; the plain-pico build has no network
module and every Wi-Fi example died on import.
- Entry points: projects whose alphabetically-first file was a library
(BlynkLib.py) or a host script (analyze.py) now ship a real main.py.
- All Blynk projects probe blynk.cloud with a 5s timeout and fall back
to an offline no-op object — a plain connect() blocks forever in the
emulated network and froze the demos.
- DHT11 -> DHT22 across six projects (the emulator speaks DHT22) and
the OLED projects use hardware I2C instead of bit-banged SoftI2C.
- 11 more examples get a wired canvas (DHT22, SSD1306, LCD1602 I2C,
membrane keypad, joystick, heart-beat sensor, LEDs): 13/49 total.
- IoT Atmospheric Monitoring (ESP32+Blynk): ship the missing bmp180.py
driver (BMP180 API over the emulated BMP280), switch SoftI2C -> hardware
I2C(0) so the emulator decodes the bus, survive an unreachable Blynk
Cloud, and add the BMP280 sensor + wiring to the canvas.
- AQI ESP: ship the missing ssd1306.py driver, DHT11 -> DHT22 (the
emulated waveform), local AQI fallback when the Flask server is absent,
and add the OLED + DHT22 canvas with wiring.
- All 49 descriptions now credit Kritish Mohapatra's upstream repo
(github.com/kritishmohapatra/100_Days_100_IoT_Projects).
Generated by test_100_days/_emit_examples_data.py in velxio-prod (which
now supports per-project velxio_diagram.json canvases).
- examples-robot-desktop: Serial messages, comments and identifiers
(right/left servos, light threshold naming, START state) across the
embedded .ino and headers
- examples-100-days: PULL_DOWN explainer comment in the MicroPython menu day
Tres cosas que salieron al tirar del hilo de los pull-ups.
1) ESP32_ADC_PIN_MAP era la tabla del ESP32 CLASICO aplicada a toda la familia, y
fallaba de dos maneras:
- S3: sus pines ADC son GPIO1..20, ninguno esta en esa tabla, asi que la
busqueda devolvia undefined y el listener del potenciometro no llegaba a
engancharse. El mando no hacia nada.
- C3/C6: GPIO0 SI esta en la tabla clasica, como ADC2_CH1 -> canal 9. Pero en
esos chips GPIO0 es ADC1_CH0 y sus motores toman un indice de canal de ADC1
(0..4). El valor se empujaba al canal 9, fuera de rango, descartado en
silencio mientras el firmware leia el 0. Una respuesta equivocada en vez de
ninguna, que es peor.
adcPinMapFor(boardKind) devuelve la tabla del chip.
2) El ejemplo de las gafas OLED en MicroPython declaraba sus botones con Pin.IN a
secas. Van entre 3V3 y el pin, asi que sin pull-down el pin queda FLOTANDO con
el boton abierto. El propio ejemplo ya lo avisaba en un comentario ("Add
Pin.PULL_DOWN if the pin floats") — ahora lo hace. Es un fallo de hardware de
verdad, no un artefacto del emulador.
3) gallery-run-gate.audit.test.ts: EditorToolbar bloquea el Run cuando el
verificador de circuito saca errores, asi que un circuito invalido no es
cosmetico, es la diferencia entre un ejemplo que arranca y uno que parece
muerto. Y esos defectos se esconden hasta que el circuito resuelve DE PUNTA A
PUNTA: c3-button llevaba un LED de 506 mA que nadie veia porque sus cables
apuntaban a pines inexistentes.
El test reproduce la puerta del Run tal cual (mismo snapshot de peor caso,
mismo buildInputFromStore, mismo verifyCircuit, ngspice de verdad) sobre los
227 ejemplos. Encontro tres mas sin resistencia en serie —nano-button-led,
mega-led-chase y mega-serial-control, 17 LEDs en total— y ahora quedan 0.
A partir de aqui, un ejemplo nuevo con un LED colgado del GPIO salta en CI.
The RP2040 MicroPython loader always fetched the plain RPI_PICO build, which
ships no `network` module and no CYW43 WiFi driver. Every Pico W WiFi/MQTT
example therefore failed at `import network` ("no module named 'network'"),
which surfaced as a compile/run error in the editor.
- getFirmware()/loadUserFiles() are now variant-aware. pi-pico-w boards load
RPI_PICO_W-20230426-v1.20.0 (network/socket/ssl + the CYW43439 driver) and
write the LittleFS at the W board's flash offset (0x12c000, 212 blocks)
instead of the plain Pico's 0xa0000/352. The W firmware spans flash to
~0xab000 and would otherwise be clobbered by the filesystem. Each variant
gets its own IndexedDB cache key.
- The variant is selected by the presence of the already-wired CYW43 emulator
(attachCyw43 runs for pi-pico-w boards only).
- loadMicroPython swaps in a fresh RP2040 each run, so the CYW43 PIO-FIFO hooks
are re-installed on the new instance; otherwise the driver's gSPI traffic
never reaches the emulator and WiFi never comes up.
- Bundle micropython-rp2040w.uf2 as the offline fallback.
- Point the ThingsBoard example at the simulator's Velxio-GUEST network.
8 MicroPython examples that use `import network` (Blynk IoT relay, ThingsBoard
IoT, OTA update, DHT11 HTTP CSV logger, async LED control, web servo, websocket
LED, IoT relay web server) had boardType "raspberry-pi-pico". A plain Pico
(RP2040) has no WiFi and no `network` module, so they failed at runtime with
`ImportError: no module named 'network'` (the banner even shows "Raspberry Pi
Pico with RP2040"). Move them all to "pi-pico-w", which has WiFi + network.
OSError: [Errno 19] ENODEV at ssd1306.SSD1306_I2C(...) on
100d-esp32-oled-smart-ui-eyes-animation-time-and-weather-micropython.
MicroPython SoftI2C bit-bangs GPIO directly. Velxio's ESP32 QEMU
bridge listens on the emulated I2C peripheral (registers slaves like
0x3C wokwi-ssd1306 against it) and doesn't decode bit-banged GPIO
toggles as I2C frames, so the OLED never sees any writes and
i2c.writeto() returns ENODEV on first use.
machine.I2C(0, ...) routes through the hardware I2C peripheral that
QEMU emulates, the registered slave receives the bytes, the OLED
panel updates. Same code path the other working SSD1306 MicroPython
examples on this repo already use.
API surface is identical to SoftI2C — only the constructor differs —
so the rest of the user sketch needs zero changes.
robot-desktop-eyes and the day-30/100-days OLED example wired the
SSD1306 OLED with SDA/SCL/VCC, but the wokwi-ssd1306 element
exposes pinInfo as DATA/CLK/VIN/GND. The mismatched names couldn't
resolve, so all three wire endpoints fell back to (0,0) of the
component and visually attached to the corner instead of the pins.
Same class of bug on the wokwi-big-sound-sensor in
robot-desktop-eyes: the element has AOUT/DOUT (no plain OUT). The
sketch uses digitalRead(SOUND_PIN), so route to DOUT.
The COMPONENT_PIN_ALIASES map in wokwiZip.ts only normalises on
.zip import — static examples have to use the real pinInfo names.
The 100d-esp32-oled-smart-ui-eyes-animation-time-and-weather-micropython
example had components: [] and wires: [] — the MicroPython code wired
an SSD1306 OLED on I2C (GPIO 21/22) plus two buttons (GPIO 14, 27) but
the circuit had nothing on the canvas, so users saw a bare ESP32 board
and the simulation was missing every peripheral the code drives.
Adds:
- wokwi-ssd1306 on I2C (3V3 / GND / SDA=21 / SCL=22)
- two wokwi-pushbuttons wired HIGH-when-pressed (3V3 → 1.l, 2.l → GPIO
14 / 27) to match the `if pin.value(): pressed` check in main.py
- Implemented `esp32_spi_chip_demo.ino` to demonstrate SPI communication with a 74HC595 shift register.
- Created `esp32_uart_chip_demo.ino` for UART loopback testing with ROT13 transformation.
- Added Python tests for compiling chips and sketches, ensuring valid WASM output and successful compilation for various board families.
- Developed end-to-end tests for ESP32 with custom chips using I2C and SPI, validating synchronous communication through the backend.
- Introduced GPIO bridge tests to verify serial communication and GPIO state changes.
- Ensured all tests validate the expected behavior of the custom chips and their interaction with the ESP32 firmware.
David Montero Crespo