Hi all. Noob here.
I am trying to create a little "Light up an LED when you receive a knock" project.
I am using a Digispark ATTiny85 with a LED and a Piezo sensor (with 1 Mega ohm resistor between the + and - of the piezo.)
negative cable of Piezo is connected to Pin 5 on AtTiny
LED is connected to Pin1
When I set my threshold too low, the LED keeps on flashing.
When I set it higher bit by bit, it gets to a point where the LED does not flash anymore, but when I then tap the Piezo it sounds like the ATTINY disconnects from USB (powering it from USB) and reconnects. Powering it from DC power supply simply does nothing if I tap the Piezo.
Herewith my "Code".
It has been adjusted from a similar project I did with Arduino Uno, with some minor changes for addressing the ports.
Please let me know where I am going wrong.
thanks.
// these constants won't change:
const int ledPin = 1;// LED connected to digital pin 1
const int knockSensor = 0; // the piezo is connected to analog pin 0 which is pin 5
const int threshold = 1095; // threshold value to decide when the detected sound is a knock or not
// these variables will change:
int sensorReading = 0; // variable to store the value read from the sensor pin
int ledState = LOW; // variable used to store the last LED status, to toggle the light
void setup() {
pinMode(ledPin, OUTPUT); // declare the ledPin as as OUTPUT
pinMode(5, INPUT);
}
void loop() {
// read the sensor and store it in the variable sensorReading:
sensorReading = analogRead(knockSensor);
// if the sensor reading is greater than the threshold:
if (sensorReading > threshold) {
digitalWrite(ledPin, HIGH); // sets the LED on
delay(100); // waits for a second
digitalWrite(ledPin, LOW); // sets the LED off
delay(500); // waits for a second
}
}
