i have written a code for Borewell controller, i am using pushbutton (Arduino UNO PIN 3) as external interrupt to Turn ON the motor. The Interrupt pin get fired even a small dupont patch lead to trigger my ISR , any idea on this?.
i have gone through all the limitations and reveiwing forum post for refrence, it was not working for me still it is triggering .
const byte interruptPin = 3;
volatile byte State = LOW;
static int overrideAddress_flag = 0;
void setup() {
Serial.begin(9600);
pinMode(interruptPin, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(interruptPin), override ,RISING);
}
void loop() {
manualOverride();
}
void override()
{
static unsigned long last_millis = 0;
unsigned long m = millis();
if (m - last_millis < 300) // 0.3 sec
{ // ignore interrupt: probably a bounce problem
}
else
{
if (State == 0)
{
overrideAddress_flag = 1;
}
if (State == 1)
{
overrideAddress_flag = 0;
}
}
}
void manualOverride()
{
if (motorState == 0)
{
if (overrideAddress_flag == 1)
{
overrideAddress_flag = 0;
motorOn();
}
}
if (motorState == 1)
{
overrideAddress_flag = 0;
motorOff();
}
}
You seem to have an external pull-down resistor fighting the internal pull-up resistor. If you are going to use an external pull-down, change the pin mode from INPUT_PULLUP to INPUT.
johnwasser:
You seem to have an external pull-down resistor fighting the internal pull-up resistor. If you are going to use an external pull-down, change the pin mode from INPUT_PULLUP to INPUT.
Hello sir ,
i have tried it now, The interrupt pin get fired continously, even a small dupont patch lead to trigger my ISR.
1. The following diagram (Fig-1) says that ACTIVE HIGH (AH) for Trigger Level of the interrupting signal is not permissible for Arduino UNO. The available options are: FALLING (Falling Edge, FE), LOW (Active Low), and RISING (Rising Edge, RE).
2. Carry out this tutorial to verify the functioning of the INT1 interrupt and then correct/tune your sketch.
Figure-2:
(1) Install the interrupting device K2 at DPin-3 of Arduino as per Fig-2. If you don’t have switch, then use a jumper. (2) Install R1-LED1 network on the breadboard as per Fig-2. (3) L is already on the UNO Board. (4) Create and upload the following sketch. Save the sketch as int1.
volatile bool flag = false;
void setup()
{
pinMode(3, INPUT_PULLUP); //internal pull-up resistor is engaged.
pinMode(8, OUTPUT);
pinMode(13, OUTPUT);
//------------------------------
attachInterrupt(digitalPinToInterrupt(2), ISRINT0, LOW); //interrupt logic auto enabled; LOW trigger level
}
void loop()
{
if(flag == true) //ISR blinks LED1 for 3 times at 2-sec interval
{
for(int i = 0; i < 5; i++)
{
digitalWrite(8, HIGH);
delay(2000);
digitalWrite(8, LOW):
delay(2000);
}
flag = false;
}
else //MLP continuously blinks L at 1-sec interval
{
digitalWrite(13, HIGH);
delay(1000);
digitalWrite(13, LOW):
delay(1000);
}
}
void ISRINT1() //Side job; it blinks LED1 for 5 times at 2-sec interval
//because delay() function does not work in ISR; so, we cannot blink LED1 here;
//blinking must be done in the loop()function based on value of flag.
{
flag = true;
} //Interrupt structure becomes enabled
(5) Press the RESET button of UNO. Check that L is continuously blinking at 1-sec interval. (6) Press K2 and hold it. Check that L is not blinking; but, LED1 is continuously blinking at 2-sec interval. (7) Release K2. Wait for a while and observe that L is blinking again at 1-sec interval.
** **(8)** **
Press K2 and hold just for a while until LED1 just makes a blink and then release K2. Check that LED1 has made 4 more blinks at 2-sec interval. Now, we have 5 blinks including first short one. (9) Check that L has started blinking at 1-sec interval. (10) Repeat the process from Step-5. (11) This is the end of INT1 tutorial.
