Easy and transparent non-blocking code using millis()

1unsigned long every200millis, every5seconds, every29seconds; 
2
3void setup() {
4   every200millis = millis(); 
5   every5seconds = every200millis; 
6   every29seconds = every200millis;
7}
8
9void loop() {
10  if (WaitMillis(&every200millis, 200)) DoProcess1(); 
11  if (WaitMillis(&every5seconds, 5000)) DoProcess2(); 
12  if (WaitMillis(&every29seconds, 29000)) DoProcess3(); 
13}
14
15bool WaitMillis(unsigned long* t, long waitMillis) { 
16   if ((millis() - *t) > waitMillis) { 
17     *t = millis(); 
18     return true; 
19   } 
20   if (millis() < *t) *t = millis();     //this row treats overflow of millis() 
21   return false; 
22}