Switch to virtual pins and then use code on the device site to transfer those virtual commands to the digital pins.
E.g. For simplicity, I am just using a using a Button Widget (set to Switch mode) on V0 and the Timer Widget on V1 to turn ON or OFF the same LED on a digital pin (including feedback to the Button when the timer kicks in ) Assuming built in LED on Arduino’s pin 13
BLYNK_WRITE(V0) { // Button Widget function
digitalWrite(13, param.asInt()); // take the state of the Button and send it to the pin
}
BLYNK_WRITE(V1) { // Timer Widget function
digitalWrite(13, param.asInt()); // take the state of the Timer and send it to the pin
Blynk.virtualWrite(V0, param.asInt()); // Send timer state back to button to update it.
}
http://docs.blynk.cc/#blynk-firmware-virtual-pins-control-blynk_writevpin
http://docs.blynk.cc/#blynk-firmware-virtual-pins-control-blynkvirtualwritevpin-value
https://www.arduino.cc/reference/en/language/functions/digital-io/digitalwrite/