Hi there!
I'm new on Arduino, and I'm trying to use the FHT library. I installed the library and when I open the fhb_adc example and verify it, it says this:
fht_adc.pde: In function 'void loop()':
fht_adc:35: error: 'fht_input' was not declared in this scope
fht_adc:37: error: 'fht_window' was not declared in this scope
fht_adc:38: error: 'fht_reorder' was not declared in this scope
fht_adc:39: error: 'fht_run' was not declared in this scope
fht_adc:40: error: 'fht_mag_log' was not declared in this scope
fht_adc:43: error: 'fht_log_out' was not declared in this scope
The library appears in the IDE, but I guess something is wrong! Please help me
did you unzip the library files and place them in your library folder manually? if not, give that a try. there have been some problems with the library import. it sounds like its finding the library, but none of the files in the library.
Hey! I manually unzip the folders and still doesn't works :c Both appears on the library menu, but I get the same error. Here is the example:
/*
fht_adc.pde
guest openmusiclabs.com 9.5.12
example sketch for testing the fht library.
it takes in data on ADC0 (Analog0) and processes them
with the fht. the data is sent out over the serial
port at 115.2kb. there is a pure data patch for
visualizing the data.
*/
#define LOG_OUT 1 // use the log output function
#define FHT_N 256 // set to 256 point fht
#include <FHT.h> // include the library
void setup() {
Serial.begin(115200); // use the serial port
TIMSK0 = 0; // turn off timer0 for lower jitter
ADCSRA = 0xe5; // set the adc to free running mode
ADMUX = 0x40; // use adc0
DIDR0 = 0x01; // turn off the digital input for adc0
}
void loop() {
while(1) { // reduces jitter
cli(); // UDRE interrupt slows this way down on arduino1.0
for (int i = 0 ; i < FHT_N ; i++) { // save 256 samples
while(!(ADCSRA & 0x10)); // wait for adc to be ready
ADCSRA = 0xf5; // restart adc
byte m = ADCL; // fetch adc data
byte j = ADCH;
int k = (j << 8) | m; // form into an int
k -= 0x0200; // form into a signed int
k <<= 6; // form into a 16b signed int
fht_input[i] = k; // put real data into bins
}
fht_window(); // window the data for better frequency response
fht_reorder(); // reorder the data before doing the fht
fht_run(); // process the data in the fht
fht_mag_log(); // take the output of the fht
sei();
Serial.write(255); // send a start byte
Serial.write(fht_log_out, FHT_N/2); // send out the data
}
}
I was having the same problem as sebautistam, but I put reorder_table_creator and arduinofft_display.pd in the FHT folder and put that right in my Arduino/libraries directory. I'm still working out what the data I'm getting in my Serial Monitor... It looks a little scary and it keeps freezing the whole program...
Maybe try something this?
there have a been a lot of people unable to properly install the FHT library lately, and i dont know what is causing it. so any input from more experienced people would be very helpful.
the reason for the wiered output data is because the code is optimized for use with PD, so the output is a serial.write, rather than a serial.println (the latter does ascii readable text, the other is just raw data).
sandrews:
I was having the same problem as sebautistam, but I put reorder_table_creator and arduinofft_display.pd in the FHT folder and put that right in my Arduino/libraries directory. I'm still working out what the data I'm getting in my Serial Monitor... It looks a little scary and it keeps freezing the whole program...
Maybe try something this?
I don't really understand what did you do, so may you explain it to me, please?
Did you took reorder_table_creator and arduinofft_display.pd files from where, and put them where?
As I said, I'm really new usiong Arduino, but I noticed that when I clicked on "Import librarie> ArduinoFHT" no code is added to the project I guess that is not okay haha
I found this library usable after I moved from the direct avr programming and changing it to the arduino language. Try using something like this:
#define LOG_OUT 1 // use the log output function
#define FHT_N 128 // set to 128 point fht
#include <FHT.h> // include the library
void setup() {
Serial.begin(9600); // use the serial port
}
void loop() {
for (int i = 0 ; i < FHT_N ; i++) { // save 128 samples
fht_input[i] = analogRead(adcPin); // put real data into bins
}
fht_window(); // window the data for better frequency response
fht_reorder(); // reorder the data before doing the fht
fht_run(); // process the data in the fht
fht_mag_log(); // take the output of the fht
for (byte i = 0 ; i < FHT_N/2 ; i++) {
Serial.print(fht_log_out[i]);
Serial.print(" ");
}
Serial.println();
}
This error appears when you include FHT library first and then define output type.
Solution to the problem is to first define output type then include the library.
This is also true for all defined parameters for FHT library like FHT_N.
Try for example defining size greater than 256 eg 512.
If FHT_N define is before FHT include, then you will receive following error
#error FHT_N value not defined
if you put #define FHT_N after FHT include, this error will be gone, and
FHT_N will have default 256 size.
#define LOG_OUT 1 // use the log output function, define before including FHT library!
#define FHT_N 256 // set fht size
#include <FHT.h> // include the library
I guess that is not okay haha