Hey Stacy, Thanks for the link; such a great post. You are right that you can use the “millis” function. This is what I used in my project to see how much time has passed before sending sensor data. I have attached some of the snippet code on how I instantiated the millis object and keep track of the time. I think you also want to do something along those lines.
//initialize times
gas_time = millis();
flame_time = millis();
pir_time = millis();
sound_time = millis();
temperature_time = millis();
ultrasonic_time = millis();
//PIR sensor
pinMode(PirInput, INPUT);
}
void loop() {
// put your main code here, to run repeatedly:
unsigned long time_passed = 0;
//device #2
//read gas sensor
// don't read analog pins too often (<1Hz), else caps never get to charge.
time_passed = millis() - gas_time;
//if roll over, send next value again
if (time_passed < 0)
{
gas_time = millis();
gas_time_send = -700000;
}
I hope that might be helpful. I am sure you also read their documentation but I am attaching the link (https://www.arduino.cc/reference/en/language/functions/time/millis/)
