板子UNO R4 WiFiOn this pageUNO R4 WiFiTutorials Cheat Sheet LED Matrix led_matrix led_matrix_text Real-Time Clock rtc rtc_periodic rtc_alarm rtc_ntp Analog-to-Digital Converter (ADC) adc Digital-to-Analog Converter (DAC) dac dac_jacques dac_piano EEPROM eeprom eeprom_guide USB HID usb_hid WiFi Network wifi_ap wifi_wpa wifi_web Examples Blink an LED blink_led, schematic blink_leds, schematic* Button button, schematic button_switch, schematic input_pullup, schematic Fade an LED fade_led, schematic Adjust an LED adjsut_led, schematic adjsut_fade_led, schematic Tone on Speaker tone_speaker, schematic* tone_speaker2, schematic* tone_melody, schematic