Im very new to arduino units and am wanting to do a knock sensor so that on the first knock it will delay 30 seconds and second knock will delay 60 seconds and 3rd knock will completely disabled. i have been able as a very new comer to write as far as this first delay but am stumped on a further step. If its a possibility to help me out and guide me through my next steps so that i may try myself. sorry if makes no sense.
const int sensorPin=A0;
const int ledPin= 13;
const int threshold= 100;
void setup()
{
pinMode(ledPin, OUTPUT);
}
void loop()
{
int val= analogRead(sensorPin);
if (val >= threshold)
{
digitalWrite(ledPin, HIGH);
delay(30000);
digitalWrite(ledPin, LOW);
}
else
digitalWrite(ledPin, LOW);
essentially i am setting up a system for remote controlled tanks, i have three piezos sensors above the tracks on either side and i wish that during the first impact the track motor is taken out for a 30 second delay, the 2nd time the tracks are hit the motor shuts down for a 60 second delay and the third time the track is completely disabled, each tank is airsoft allowing for the knock against the sensor
(YMMV; compiles for a Mega2560 but not tested; also not coded to super-duper ISO MISRA C- or CPP standards; may offend those who make a living coding...)
const int sensorPin=A0;
const int ledPin= 13;
#define NO_HIT_CHECKTIME 2L //checks between no-hits is 2mS
#define POST_HIT_CHECKTIME 10L //after a hit, next check is 10mS to allow for sensor settling/noise abatement
#define HIT_THRESHOLD 100
#define TRACK_REPAIR_TIME 30000L //mS
#define ENGINE_REPAIR_TIME 60000L //mS
//tank status states
#define HEALTHY 0
#define TANK_HIT 1
#define TANK_REPAIR 2
#define TANK_DEAD 3
int
hitCount;
void setup()
{
pinMode(ledPin, OUTPUT);
hitCount = 0;
}//setup
void loop()
{
AssessHits();
DamageHandler();
}//loop
void AssessHits()
{
static unsigned long
hitCheckInterval = millis() + NO_HIT_CHECKTIME;
unsigned long
timeNow;
//reads sensors every HIT_CHECK_TIME mS
//may want to add some filtering or additional time after a hit for sensor settling etc
timeNow = millis();
if( timeNow >= hitCheckInterval )
{
if( analogRead( sensorPin >= HIT_THRESHOLD ) )
{
hitCount++;
hitCheckInterval = timeNow + POST_HIT_CHECKTIME;
}
else
hitCheckInterval = timeNow + NO_HIT_CHECKTIME;
}//if
}//AssessHits
void DamageHandler()
{
static int
lastHitCount;
static unsigned long
timeRecovery;
static byte
damageState = HEALTHY;
switch( damageState )
{
case HEALTHY:
if( hitCount )
{
//tank hit
digitalWrite(ledPin, HIGH);
damageState = TANK_HIT;
}//if
else
//not hit detected
digitalWrite(ledPin, LOW);
break;
case TANK_HIT:
lastHitCount = hitCount;
//first hit damaged tracks
timeRecovery = millis() + TRACK_REPAIR_TIME;
damageState = TANK_REPAIR;
break;
case TANK_REPAIR:
if( hitCount == lastHitCount )
{
//have not been hit since last hit; keep repairing existing damage
if( millis() >= timeRecovery )
{
//time of repair has finished; tank is healthy
hitCount = 0;
damageState = HEALTHY;
}//if
}//if
else
{
//crap...tank has been hit again; is this 1-2 (engine damage now) or 2-3 (dead)?
if( hitCount == 2 )
{
//took another hit when still repairing first; reset repair timer to "engine" time
timeRecovery = millis() + ENGINE_REPAIR_TIME;
lastHitCount = hitCount;
}//if
else
{
//tank has taken three hits before repairs completed; dead
damageState = TANK_DEAD;
}//else
}
break;
case TANK_DEAD:
//there's no recovery from dead
//though you could add a reset switch or something to get out of this state...
break;
}//switch
}//DamageHandler
