Can anyone help me code this certain problem I'm having trouble with.
What I would like to happen is this:
Let us say that I have a variable "state1=0" and "state2 =0" and 2 sensors.
Sensor 1 is triggered ---> state1 = 1 -----> wait for at least 5 seconds -----> if sensor 2 is not triggered then turn state1 back to 0.
If sensor 2 is triggered within the given time (5 sec) ------> state2 = 1 ----> if state1 = 1 && state2 = 1 -----> total ++ -------> turn state1 and state2 back to 0.
The "waiting for at least 5 seconds" is the part that I am having trouble with and probably the part that I don't know how to code. Can anyone help me with this or luckily help me code this problem?
LarryD
May 12, 2021, 7:19pm
#2
Watch this:
Read this:
NOTE for newcomers. The demo is entirely contained in this Post and Reply #1. There is no need to read further unless you are interested. …added 25Sep2014
There have been a few occasions recently where newcomers seemed to have difficulty applying the “blink without delay” and “state” concepts to a sketch that is intended to manage a number of concurrent actions.
Its very time consuming to respond with suitable code examples - particularly as every case is a little different.
I have prepared t…
Come back if you have problems.
gcjr
May 12, 2021, 10:58pm
#3
consider
enum { Off = HIGH, On = LOW };
byte ledPin = 13;
byte sensors [] = { A1, A2 };
#define N_SENSOR sizeof(sensors)
byte sensorState [N_SENSOR];
#define Interval 5000
unsigned long msecTrig = 0;
int count = 0;
byte state = 0;
char s [80];
// -----------------------------------------------------------------------------
void setup () {
Serial.begin (9600);
for (unsigned n = 0; n < N_SENSOR; n++) {
pinMode (sensors [n], INPUT_PULLUP);
sensorState [n] = digitalRead (sensors [n]);
}
pinMode (ledPin, OUTPUT);
}
// -----------------------------------------------------------------------------
// check for sensor (button) event
int
chkSensors () {
for (unsigned n = 0; n < N_SENSOR; n++) {
byte sensor = digitalRead (sensors [n]);
// check for change in state
if (sensorState [n] != sensor) {
sensorState [n] = sensor;
if (On == sensor) { // check if active
return n;
}
}
}
return -1;
};
// -----------------------------------------------------------------------------
void loop () {
unsigned long msec = millis ();
// check if armed and time expired
if (state && (msec - msecTrig) > Interval) {
state = 0;
count++;
Serial.println (count);
}
switch (chkSensors ()) {
case 1:
state = 0; // disarm
break;
case 0:
state = 1; // arm
msecTrig = msec;
break;
}
digitalWrite (ledPin, ! state);
}
jimLee
May 12, 2021, 11:15pm
#4
Here is a framework that only checks sensors every 5 sec and doesn't do any blocking.. Don't know about the rest of the stuff you want. But maybe this''ll help?
#include <timeObj.h>
timeObj intervalTimer(5000);
void setup () {
Serial.begin (9600);
// Setup sensors..
}
// check the sensors..
int checkSensors () {
// DO your sensor thing.
Serial.println("Time to check!");
};
void loop (void) {
if (intervalTimer.ding()) { // If the timer has expired..
checkSensors(); // Do your check stuff.
intervalTimer.stepTime(); // reset the timer.
}
}
You will need to grab LC_baseTools from the IDE library manager to compile this.
Good luck!
-jim lee
Thanks for the help and the different approaches. I'll work my way around it and I'll come back if ever I encounter problems.
drmpf
May 13, 2021, 5:56am
#6
Check out the example sketch for this in my tutorial on How to write Timers and Delays in Arduino DelayExecution.ino example in the Delay execution until condition has been true for X secs section.
Also check out my tutorial on Multi-tasking in Arduino for re-forming your sketch as a series of tasks
Help as I was trying to apply what I have learned reading about millis(). I have encountered this problem that even the if statement is not true parts of logic is being executed here is my code.
#define trig_1 2
#define echo_1 3
#define trig_2 4
#define echo_2 5
int interval(5000);
float d_1, d_2;
int control1 = 0, control2 = 0;
void setup()
{
Serial.begin(9600);
}
void loop()
{
unsigned long currentMillis = millis();
long sensor1_Time;
sensor(trig_1, echo_1, d_1);
delay(30);
sensor(trig_2, echo_2, d_2);
delay(30);
if(d_1 <= 12)
{
sensor1_Time = currentMillis;
control1 = 1;
}
Serial.print(currentMillis);
Serial.print(" sensor time: ");
Serial.print(sensor1_Time);
Serial.print(" control1: ");
Serial.println(control1);
}
void sensor(int trig, int echo, float &distance)
{
float duration;
pinMode(trig, OUTPUT);
pinMode(echo, INPUT);
digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig, HIGH);
delay(5);
digitalWrite(trig, LOW);
duration = pulseIn(echo, HIGH);
distance = (0.013464 * duration) / 2; //distance in inches
}
once I try uploading the code, from the if statement "if(d_1 <= 12)" even if it is not true "control1 = 1" is executed. resulting to this in the serial monitor
0 sensor time: 0 control1: 1
1453 sensor time: 0 control1: 1
1549 sensor time: 0 control1: 1
1645 sensor time: 0 control1: 1
1741 sensor time: 0 control1: 1
1838 sensor time: 0 control1: 1
1934 sensor time: 0 control1: 1
2030 sensor time: 0 control1: 1
2126 sensor time: 0 control1: 1
2223 sensor time: 0 control1: 1
Initially control1 = 0 but here as you can see even the if statement is not true control1 value is changed to 1. When I tried making the if statement true the following are the result from the serial monitor
9195 sensor time: 9195 control1: 1
9282 sensor time: 9195 control1: 1
9378 sensor time: 9195 control1: 1
9475 sensor time: 9195 control1: 1
You can see here that the if statement is working properly because when it became true the currentMillis values are stored in the sensor1_Time variable. My problem is that the "control1" value is changed even when the if statement is false can anyone help me with this so that I can continue trying what I have started? Thanks.
Try printing the value of d_1.
@wildbill
the value of d_1 below
0 sensor time: 0 control1: 1 d_1: 0.00
1453 sensor time: 0 control1: 1 d_1: 70.49
1550 sensor time: 0 control1: 1 d_1: 69.70
1646 sensor time: 0 control1: 1 d_1: 69.70
1742 sensor time: 0 control1: 1 d_1: 69.66
and when I make the if statement true, here are the results
3288 sensor time: 3288 control1: 1 d_1: 7.12
3375 sensor time: 3375 control1: 1 d_1: 5.62
3462 sensor time: 3462 control1: 1 d_1: 4.89
3549 sensor time: 3549 control1: 1 d_1: 2.54
3635 sensor time: 3635 control1: 1 d_1: 2.57
3722 sensor time: 3722 control1: 1 d_1: 3.08
There's nothing in your code that sets control_1 to anything but 1. If it ever gets set to 1, it will never change - as you observe.
I think I found the problem the initial value of d_1 at start up is 0.00 making the if statement true.
Sorry for the multiple questions but I have encountered yet another problem with millis()
#define trig_1 2
#define echo_1 3
#define trig_2 4
#define echo_2 5
int interval(5000);
float d_1, d_2;
int control1 = 0, control2 = 0;
void setup()
{
Serial.begin(9600);
}
void loop()
{
unsigned long currentMillis = millis();
unsigned long sensor1_Time;
sensor(trig_1, echo_1, d_1);
delay(30);
sensor(trig_2, echo_2, d_2);
delay(30);
if(d_1 <= 12 && d_1 != 0)
{
sensor1_Time = currentMillis;
control1 = 1;
if(currentMillis - sensor1_Time >= interval)
{
control1 = 0;
}
}
Serial.print(currentMillis);
Serial.print(" sensor time: ");
Serial.print(sensor1_Time);
Serial.print(" control1: ");
Serial.print(control1);
Serial.print(" d_1: ");
Serial.println(d_1);
}
void sensor(int trig, int echo, float &distance)
{
float duration;
pinMode(trig, OUTPUT);
pinMode(echo, INPUT);
digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig, HIGH);
delay(5);
digitalWrite(trig, LOW);
duration = pulseIn(echo, HIGH);
distance = (0.013464 * duration) / 2; //distance in inches
}
When I uploaded the code the serial monitor prints this
0 sensor time: 285541121 control1: 0 d_1: 0.00
1454 sensor time: 285541121 control1: 0 d_1: 69.70
1550 sensor time: 285541121 control1: 0 d_1: 69.60
1647 sensor time: 285541121 control1: 0 d_1: 69.64
1744 sensor time: 285541121 control1: 0 d_1: 69.04
1841 sensor time: 285541121 control1: 0 d_1: 69.03
1938 sensor time: 285541121 control1: 0 d_1: 69.80
I don't know why my sensor time is printing that value. but when I make the if statement true this is what I get from the serial monitor
3486 sensor time: 3486 control1: 1 d_1: 8.76
3574 sensor time: 3574 control1: 1 d_1: 6.02
3661 sensor time: 3661 control1: 1 d_1: 4.35
3748 sensor time: 3748 control1: 1 d_1: 2.38
3834 sensor time: 3834 control1: 1 d_1: 3.46
3921 sensor time: 3921 control1: 1 d_1: 4.75
4007 sensor time: 3921 control1: 1 d_1: 70.00
4105 sensor time: 3921 control1: 1 d_1: 69.19
4201 sensor time: 3921 control1: 1 d_1: 69.04
4297 sensor time: 3921 control1: 1 d_1: 69.65
4395 sensor time: 3921 control1: 1 d_1: 69.03
4491 sensor time: 3921 control1: 1 d_1: 69.18
4587 sensor time: 3921 control1: 1 d_1: 69.03
4683 sensor time: 3921 control1: 1 d_1: 68.99
4781 sensor time: 3921 control1: 1 d_1: 69.04
4877 sensor time: 3921 control1: 1 d_1: 69.20
4973 sensor time: 3921 control1: 1 d_1: 69.20
5069 sensor time: 3921 control1: 1 d_1: 68.99
5167 sensor time: 3921 control1: 1 d_1: 69.19
5263 sensor time: 3921 control1: 1 d_1: 69.20
5359 sensor time: 3921 control1: 1 d_1: 69.37
5455 sensor time: 3921 control1: 1 d_1: 69.20
5553 sensor time: 3921 control1: 1 d_1: 69.04
5649 sensor time: 3921 control1: 1 d_1: 69.03
5745 sensor time: 3921 control1: 1 d_1: 69.02
5841 sensor time: 3921 control1: 1 d_1: 69.03
5939 sensor time: 3921 control1: 1 d_1: 69.03
6035 sensor time: 3921 control1: 1 d_1: 69.53
6131 sensor time: 3921 control1: 1 d_1: 68.87
6228 sensor time: 3921 control1: 1 d_1: 68.87
6325 sensor time: 3921 control1: 1 d_1: 69.20
6421 sensor time: 3921 control1: 1 d_1: 69.70
6517 sensor time: 3921 control1: 1 d_1: 68.98
6615 sensor time: 3921 control1: 1 d_1: 69.03
6711 sensor time: 3921 control1: 1 d_1: 69.35
6807 sensor time: 3921 control1: 1 d_1: 69.03
6903 sensor time: 3921 control1: 1 d_1: 69.69
7001 sensor time: 3921 control1: 1 d_1: 69.19
7097 sensor time: 3921 control1: 1 d_1: 68.84
7193 sensor time: 3921 control1: 1 d_1: 69.69
7290 sensor time: 3921 control1: 1 d_1: 69.02
7387 sensor time: 3921 control1: 1 d_1: 69.03
7483 sensor time: 3921 control1: 1 d_1: 69.03
7580 sensor time: 3921 control1: 1 d_1: 69.69
7676 sensor time: 3921 control1: 1 d_1: 68.85
7773 sensor time: 3921 control1: 1 d_1: 69.03
7869 sensor time: 3921 control1: 1 d_1: 68.81
7966 sensor time: 3921 control1: 1 d_1: 69.18
8062 sensor time: 3921 control1: 1 d_1: 69.70
As you can see it registered the current time value of the millis(); but I don't know why at start it was showing those large numbers. Another problem is that even though it has reached my interval which is int interval(5000); the control1 value does not return back to 0. I can't manage to find where I got it wrong. can anyone yet help me again please?
Update on my code/ project. Everything is working fine now. Thanks to you guys I have made my code and sensors less buggy. Thanks for all of your help I appreciate it a lot.
system
September 12, 2021, 3:43pm
#14
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