In an attempt to utilize the filters.h library files necessary for the sketch referenced in this tutorial:
I ran into a situation where there seems to be two different "filters" library sources:
You can install through "Manage Libraries" a 'Filters.h' which is authored by Hideakitai.
If you follow the links in the above referenced article it takes you to:
playground.arduino.cc/Code/Filters
In turn that link references the GitHub link:
This is authored by Jon Hub and when you select "Code:" it gives you access to a download zip file named: Filters-master.zip
When you extract that into the Arduino libraries folder it is named "Filters-master".
When you compile the Instructables' author's sketch code (downloaded as
F7NOLCXIMKTOH3M.ino) AC_Sensor_Example in the IDE you get 'filters' related errors because the IDE is not looking at the correct library file. You have to rename the library folders or change the "#include <Filters.h>' to "Filters-master". This was confusing me for a bit. Did I
overlook something or go about it incorrectly in adding to the IDE library? And can I just add the contents of the Filters-master folder into the Filters folder previously established by the IDE's 'Manage Library' function? I hope I have not thoroughly confused those who read this thread. Lol
#include <Filters.h>
float testFrequency = 60; // test signal frequency (Hz)
float windowLength = 20.0/testFrequency; // how long to average the signal, for statistist
int sensorValue = 0;
float intercept = -0.1129; // to be adjusted based on calibration testing
float slope = 0.0405; // to be adjusted based on calibration testing
float current_amps; // estimated actual current in amps
unsigned long printPeriod = 1000; // in milliseconds
// Track time in milliseconds since last reading
unsigned long previousMillis = 0;
void setup() {
Serial.begin( 57600 ); // start the serial port
}
void loop() {
RunningStatistics inputStats; // create statistics to look at the raw test signal
inputStats.setWindowSecs( windowLength );
while( true ) {
sensorValue = analogRead(A0); // read the analog in value:
inputStats.input(sensorValue); // log to Stats function
if((unsigned long)(millis() - previousMillis) >= printPeriod) {
previousMillis = millis(); // update time
// display current values to the screen
Serial.print( "\n" );
// output sigma or variation values associated with the inputValue itsel
Serial.print( "\tsigma: " ); Serial.print( inputStats.sigma() );
// convert signal sigma value to current in amps
current_amps = intercept + slope * inputStats.sigma();
Serial.print( "\tamps: " ); Serial.print( current_amps );
}
}
}
Error message:
Arduino: 1.8.19 (Linux), Board: "Arduino Uno WiFi Rev2, None (ATMEGA4809)"
/tmp/arduino_modified_sketch_395090/UNO_AC_Current_Example.ino: In function 'void loop()':
UNO_AC_Current_Example:21:3: error: 'RunningStatistics' was not declared in this scope
RunningStatistics inputStats; // create statistics to look at the raw test signal
^~~~~~~~~~~~~~~~~
UNO_AC_Current_Example:22:3: error: 'inputStats' was not declared in this scope
inputStats.setWindowSecs( windowLength );
^~~~~~~~~~
/tmp/arduino_modified_sketch_395090/UNO_AC_Current_Example.ino:22:3: note: suggested alternative: 'PinStatus'
inputStats.setWindowSecs( windowLength );
^~~~~~~~~~
PinStatus
Multiple libraries were found for "Filters.h"
Used: /home/ed/Arduino/libraries/Filters
Not used: /home/ed/Arduino/libraries/Filters-master
exit status 1
'RunningStatistics' was not declared in this scope
Library folder screenshot:
