We wanted to make a “high five” bot at work, because…
This was my first test, basically, an arduino runs a sonar range finder, when it detects an object within a certain distance, it activates a relay which allows current to flow into an air pump resulting in the blow up arm extending for a high five!
Here’s the code:
[pastacode lang=”cpp” message=”” highlight=”” provider=”manual”]
const int pump = 11;
const int pingPin = 7;
long in;
void setup() {
Serial.begin(9600);
pinMode(pump, OUTPUT);
}
void loop() {
in = ping();
if(in < 7) {
digitalWrite(pump, HIGH);
// fill the arm
delay(2000);
}
digitalWrite(pump, LOW);
delay(100);
}
long ping() {
long duration, inches, cm;
pinMode(pingPin, OUTPUT);
digitalWrite(pingPin, LOW);
delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
delayMicroseconds(5);
digitalWrite(pingPin, LOW);
pinMode(pingPin, INPUT);
duration = pulseIn(pingPin, HIGH);
inches = microsecondsToInches(duration);
// cm = microsecondsToCentimeters(duration);
Serial.print(inches);
Serial.print("in, ");
// Serial.print(cm);
// Serial.print("cm");
Serial.println();
// delay(100);
return inches;
}
long microsecondsToInches(long microseconds)
{
// According to Parallax's datasheet for the PING))), there are
// 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
// second). This gives the distance travelled by the ping, outbound
// and return, so we divide by 2 to get the distance of the obstacle.
// See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
return microseconds / 74 / 2;
}
long microsecondsToCentimeters(long microseconds)
{
// The speed of sound is 340 m/s or 29 microseconds per centimeter.
// The ping travels out and back, so to find the distance of the
// object we take half of the distance travelled.
return microseconds / 29 / 2;
}
[/pastacode]
If you don’t know how to wire a relay, refer here: https://iwearshorts.com/blog/how-to-wirecontrol-a-relay-with-arduino-or-raspberry-pi/
I used:
- a JZC-11F relay (5V vcc and 120V rating up to 5 Amps)
- air pump from amazon
- ping sonar finder
- arduino
- diode
- leds (for effect)