No, there will be issues in 50 days or so if you do this
if (millis() >= time_1 + INTERVAL_MESSAGE1) {
There are plenty of good tutorials on using millis(), look at blink without delay to get started.
No, there will be issues in 50 days or so if you do this
if (millis() >= time_1 + INTERVAL_MESSAGE1) {
There are plenty of good tutorials on using millis(), look at blink without delay to get started.