I want to print x variable for x amount of time.
Example:
If i have a Serial.print("A") and i enter a 5000, i want to print "A" for 5 sec. (The amount of times that "A" will be print is going to be determinated by a delay).
time = serial.read()
start = millis()
while millis() - start < time do
serial.print('A')
delay(print_delay)
end
That doesn't compile 
unsigned long time = Serial.parseInt();
unsigned long start = millis();
while (millis() - start < time ) {
Serial.print('A');
}
Note: you will get a LOT of output
does this mean repeatedly for 5 secs, after 5 secs, ???
When is the assignment due?
isnt a assignment bro xd just a personal proyect.
only repeat it for 5 secs, not 5 times. And starting instantly xd
Have you tried the code in reply #3?
What use does it have?
yes bro, but doesnt read the serial. 
Post your complete sketch, in code tags please.
Im making a kind of "monitoring center", I want that when I send a certain command (26 / millis), it will print the variables of my sensors for that time.
For example:
~,100/26/10000
When i send this command the serial should print the variables for 10 secs xd
unsigned long time = Serial.parseInt();
unsigned long start = millis();
void setup() {
Serial.begin(9600);
}
void loop() {
while (millis() - start < time ) {
Serial.print('A');
delay(1000);
}
}
just copy and paste to see if it works
char s [80];
#define Period 5000
unsigned long msecLst;
void
loop (void)
{
unsigned long msec = millis ();
if (msecLst && (msec - msecLst) < Period)
Serial.println (s);
if (Serial.available ()) {
int n = Serial.readBytesUntil ('\n', s, sizeof(s));
s [n] = 0;
msecLst = msec;
}
}
void
setup (void)
{
Serial.begin (9600);
}
I regard that as very unclear, you only explain the last number ~,100/26/10000.
I interpret the 26 as millis between prints,
and the part before it as some kind of parameter specification.
So the action for the example is to print millis and ~,100 all 26 millis, for 10000 millis.
I execute the example from setup,
after that it should accept serial lines separated by CR or NL and CR.
const char example[] = "~,100/26/10000";
bool printActive;
uint32_t printStart;
uint32_t printLast;
uint32_t printFor;
uint32_t printRepeatAll;
char what[10];
void setup() {
Serial.begin(115200);
Serial.println(F("print for"));
oneLineReceived(example);
}
void loop() {
handleSerial();
if (printActive) {
if (millis() - printStart >= printFor) {
printActive = false;
} else if (millis() - printLast >= printRepeatAll) {
printData();
}
}
}
void printData() {
Serial.print(millis());
Serial.print(F(": "));
Serial.println(what);
printLast = millis();
}
void oneLineReceived(const char* buffer) {
char* ptr = strchr(buffer, '/');
if (ptr != nullptr) {
strncpy(what, buffer, min((uint16_t)(ptr - buffer), sizeof(what) - 1));
printRepeatAll = strtoul(++ptr, &ptr, 0);
if (*ptr == '/') {
printFor = strtoul(++ptr, nullptr, 0);
printActive = true;
printStart = millis();
printData();
return;
}
}
Serial.print(F("could not understand '"));
Serial.print(buffer);
Serial.println(F("'"));
}
const byte maxMsgLen = 32;
void handleSerial() {
static uint8_t bIndex;
static uint8_t buffer[maxMsgLen + 1];
bool lineReady = false;
if (Serial.available()) {
uint8_t inChar = Serial.read();
if (inChar != 10) {
if (inChar == 13) {
lineReady = true;
} else {
buffer[bIndex++] = inChar;
lineReady = (bIndex == maxMsgLen);
}
if (lineReady) {
buffer[bIndex] = 0;
oneLineReceived((const char*)buffer);
bIndex = 0;
}
}
}
}
1 Like
Thx bro, it isnt what I wanted to say exactly but with ur code i was able to get what i was looking for!
You forgot to post the working sketch, so we could see, what you were unable to describe.
Of course it does not.. OP was fishing for a copy-paste solution, and I posted the answer as pseudo code. OP got a copy-paste solution and probably learned nothing from it.
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