Indeed, just use millis() timing. Look at Blink Without Delay, modify that. Unless the device has to do a lot more work, this will do just fine.
How do you plan to do a 555 circuit? They normally can't provide duty cycles of >50%.
Indeed, just use millis() timing. Look at Blink Without Delay, modify that. Unless the device has to do a lot more work, this will do just fine.
How do you plan to do a 555 circuit? They normally can't provide duty cycles of >50%.