From c22e30a4a6ef014c7a5086ad47eaab7740a75ff2 Mon Sep 17 00:00:00 2001
From: Ceimour <113631258+Ceimour@users.noreply.github.com>
Date: Sun, 30 Apr 2023 08:50:18 -0500
Subject: Refactored Ppg for frequency based algorithm. (#1486)

New implementation of the heart rate sensor data processing using a frequency based PPG algorithm.
The HRS3300 settings are fine-tuned for better signal to noise at 10Hz.
The measurement delay is now set to 100ms.
Enable and use the ambient light sensor.
FFT implementation based on ArduinoFFT (https://github.com/kosme/arduinoFFT, GPLv3.0).
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 src/libs/arduinoFFT-develop/changeLog.txt | 40 +++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 src/libs/arduinoFFT-develop/changeLog.txt

(limited to 'src/libs/arduinoFFT-develop/changeLog.txt')

diff --git a/src/libs/arduinoFFT-develop/changeLog.txt b/src/libs/arduinoFFT-develop/changeLog.txt
new file mode 100644
index 00000000..d49b8548
--- /dev/null
+++ b/src/libs/arduinoFFT-develop/changeLog.txt
@@ -0,0 +1,40 @@
+02/22/20 v1.9.2
+Fix compilation on AVR systems.
+
+02/22/20 v1.9.1
+Add setArrays() function because of issue #32.
+Add API migration info to README and improve README.
+Use better sqrtf() approximation.
+
+02/19/20 v1.9.0
+Remove deprecated API. Consistent renaming of functions to lowercase.
+Make template to be able to use float or double type (float brings a ~70% speed increase on ESP32).
+Add option to provide cache for window function weighing factors (~50% speed increase on ESP32).
+Add some #defines to enable math approximisations to further speed up code (~40% speed increase on ESP32).
+
+01/27/20 v1.5.5
+Lookup table for constants c1 and c2 used during FFT comupting. This increases the FFT computing speed in around 5%.
+
+02/10/18 v1.4
+Transition version. Minor optimization to functions. New API. Deprecation of old functions.
+
+12/06/18 v1.3
+Add support for mbed development boards.
+
+09/04/17 v1.2.3
+Finally solves the issue of Arduino IDE not correctly detecting and highlighting the keywords.
+
+09/03/17 v1.2.2
+Solves a format issue in keywords.txt that prevented keywords from being detected.
+
+08/28/17 v1.2.1
+Fix to issues 6 and 7. Not cleaning the imaginary vector after each cycle leaded to erroneous calculations and could cause buffer overflows.
+
+08/04/17 v1.2
+Fix to bug preventing the number of samples to be greater than 128. New logical limit is 32768 samples but it is bound to the RAM on the chip.
+
+05/12/17 v1.1
+Fix issue that prevented installation through the Arduino Library Manager interface.
+
+05/11/17 v1.0
+Initial commit to Arduino Library Manager.
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