Hi! I have been working on a project that is using the acs723 sensor to measure the ac current changes. Part of the problem I am having however is actually detecting the change because of how noisy the output is. This is my code that I am using. Thank you!
#include <SPI.h>
bool led_status = false;
const int leftAnalogInPin = A1;
//const int rightAnalogInPin = A1;
const int burstSamples = 10;
float average = 0;
double sensorValue = 0;
const int windowSize = 30;
float windowBuffer[windowSize] = {0};
int windowIndex = 0;
int windowCount = 0;
float windowSum = 0;
int leftBallNum = 1;
float sensitivity = 40.0 / 100.0;
float Vref = 2500;
void setup() {
pinMode(leftAnalogInPin, INPUT);
// Initialize serial and wait for port to open:
Serial.begin(9600);
// This delay gives the chance to wait for a Serial Monitor without blocking if none is found
delay(1500);
// Defined in thingProperties.h
double sumSquares = 0;
for (int i = 0; i < burstSamples; i++) {
double reading = analogRead(leftAnalogInPin);
sumSquares += reading * reading;
delay(6);
}
sumSquares /= burstSamples;
average = sqrt(sumSquares);
// Initialize moving average buffer with initial readings
windowSum = 0;
for (int i = 0; i < windowSize; ++i) {
// take burst-averaged sensor reading
double rawSum = 0;
for (int k = 0; k < burstSamples; ++k) {
rawSum += analogRead(leftAnalogInPin);
delay(4);
}
double rawAvg = rawSum / burstSamples;
double voltage = 4.88 * rawAvg;
double current = (voltage - Vref) * sensitivity;
windowBuffer[i] = current;
windowSum += current;
}
windowCount = windowSize;
average = windowSum / windowCount;
Serial.print("Init moving average: "); Serial.println(average);
delay(1500);
// Get MAC address:
//if(!SetupMapping())
//{
//Serial.println("Failed");
//}
}
void loop() {
//if (led_status){
//digitalWrite(LED_BUILTIN, HIGH);
//}
//else
//digitalWrite(LED_BUILTIN, LOW);
//matrix.setTextSize(1);
//matrix.fillScreen(0);
double sumSquares = 0;
for (int i = 0; i < burstSamples; i++) {
double reading = analogRead(leftAnalogInPin);
sumSquares += reading;//reading * reading;
delay(6);
//while(timer.read() < 6)
//{
//drawEverything( rightLaneValue, rightBallNum, leftLaneValue, leftBallNum,
//rightStartPos, rightString, leftString, leftStartPos);
//matrix.show();
//}
//timer.pause();
//timer.restart();
}
sensorValue = sumSquares / burstSamples;
double voltage = 4.88 * sensorValue;
double current = (voltage - Vref) * sensitivity;
float diff = abs(current - average);
// Toggle logic disabled for tuning:
if (diff >= 6.25f) {
// leftBallNum toggles 1<->2 on threshold exceed
leftBallNum = (leftBallNum == 1) ? 2 : 1;
}
else {
windowSum -= windowBuffer[windowIndex];
windowBuffer[windowIndex] = current;
windowSum += current;
windowIndex++;
if(windowIndex >= windowSize)
{
windowIndex = 0;
}
if (windowCount < windowSize)
{
windowCount++;
}
float movingAvg = windowSum / windowCount;
average = movingAvg;
}
Serial.println(current);
//delay(500);
//drawEverything( rightLaneValue, rightBallNum, leftLaneValue, leftBallNum,
//rightStartPos, rightString, leftString, leftStartPos);
//matrix.show();
}
/*
Since LeftLaneName is READ_WRITE variable, onLeftLaneNameChange() is
executed every time a new value is received from IoT Cloud.
*/
void onLeftLaneNameChange() {
// Add your code here to act upon LeftLaneName change
}
/*
Since LeftStartPos is READ_WRITE variable, onLeftStartPosChange() is
executed every time a new value is received from IoT Cloud.
*/
void onLeftStartPosChange() {
// Add your code here to act upon LeftStartPos change
}
/*
Since LeftString is READ_WRITE variable, onLeftStringChange() is
executed every time a new value is received from IoT Cloud.
*/
void onLeftStringChange() {
// Add your code here to act upon LeftString change
}
/*
Since Light is READ_WRITE variable, onLightChange() is
executed every time a new value is received from IoT Cloud.
*/
void onLightChange() {
// Add your code here to act upon Light change
}
/*
Since RightLaneNum is READ_WRITE variable, onRightLaneNumChange() is
executed every time a new value is received from IoT Cloud.
*/
void onRightLaneNumChange() {
// Add your code here to act upon RightLaneNum change
}
/*
Since LeftLaneNum is READ_WRITE variable, onLeftLaneNumChange() is
executed every time a new value is received from IoT Cloud.
*/
void onLeftLaneNumChange() {
// Add your code here to act upon LeftLaneNum change
}
/*
Since RightStartPos is READ_WRITE variable, onRightStartPosChange() is
executed every time a new value is received from IoT Cloud.
*/
void onRightStartPosChange() {
// Add your code here to act upon RightStartPos change
}
/*
Since RightString is READ_WRITE variable, onRightStringChange() is
executed every time a new value is received from IoT Cloud.
*/
void onRightStringChange() {
// Add your code here to act upon RightString change
}
/*
Since ShowDefaultValues is READ_WRITE variable, onShowDefaultValuesChange() is
executed every time a new value is received from IoT Cloud.
*/
void onShowDefaultValuesChange() {
// Add your code here to act upon ShowDefaultValues change
}
/*
Since LeftBallNum is READ_WRITE variable, onLeftBallNumChange() is
executed every time a new value is received from IoT Cloud.
*/
void onLeftBallNumChange() {
// Add your code here to act upon LeftBallNum change
}
/*
Since RightBallNum is READ_WRITE variable, onRightBallNumChange() is
executed every time a new value is received from IoT Cloud.
*/
void onRightBallNumChange() {
// Add your code here to act upon RightBallNum change
}
/*
Since SensorValue is READ_WRITE variable, onSensorValueChange() is
executed every time a new value is received from IoT Cloud.
*/
void onSensorValueChange() {
// Add your code here to act upon SensorValue change
}
