Arduino Uno R4 blink
Official ArduinoCore-renesas firmware runs on the real emulated RA4M1 and drives the solved 5 V D13 net. The board art includes the live cycle-observed 12×8 matrix and real D13, TX, RX and power lamps.

What's on the bench
- Arduino Uno R4
- Battery
- LED
- Resistor
How it's wired
- Battery · pos→Arduino Uno R4 · 5v
- Battery · neg→Arduino Uno R4 · gnd
- Arduino Uno R4 · d13→Resistor · a
- Resistor · b→LED · a
- LED · k→Arduino Uno R4 · gnd2
The code
This Arduino C++ sketch lives in the Code tab; sign in and press Compile & upload to build real firmware for the emulated board.
// Official-core UNO R4 WiFi Blink fixture. Edit it, then compile // through the fixed arduino:renesas_uno:unor4wifi server target. void setup() { pinMode(13, OUTPUT); } void loop() { digitalWrite(13, HIGH); delay(500); digitalWrite(13, LOW); delay(500); }
Firmware licence
Notice: this firmware uses the LGPL-licensed Arduino core library
arduino-unor4wifi-blink.bin is statically linked with ArduinoCore-renesas 1.6.0, in Breadboard's port of its UNO R4 WiFi variant to Renesas FSP 5.3.0. Parts of that core are licensed under the GNU Lesser General Public License, version 2.1 or (at your option) any later version ("the Library"). Breadboard distributes this firmware under terms that permit you to modify the work for your own use and to reverse engineer it for debugging such modifications.
- Relink package: arduino-unor4wifi-blink-relink.zip (344 KB)
- Corresponding source: ArduinoCore-renesas-1.6.0-fsp53-source.zip (3.7 MB)
- Licence texts and relink instructions



