diff --git a/examples/PulseSensor_ATtiny85_Serial/PulseSensor_ATtiny85_Serial.ino b/examples/PulseSensor_ATtiny85_Serial/PulseSensor_ATtiny85_Serial.ino
index 374ab21..54a4d9f 100644
--- a/examples/PulseSensor_ATtiny85_Serial/PulseSensor_ATtiny85_Serial.ino
+++ b/examples/PulseSensor_ATtiny85_Serial/PulseSensor_ATtiny85_Serial.ino
@@ -23,7 +23,7 @@
    Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use
    interrupts to automatically read and process PulseSensor data.
 
-   See ProcessEverySample.ino for an example of not using interrupts.
+   See PulseSensor_BPM_Alternative.ino for an example of not using interrupts.
 */
 #define USE_ARDUINO_INTERRUPTS true
 #include <PulseSensorPlayground.h>
diff --git a/examples/PulseSensor_ATtiny85_noSerial/PulseSensor_ATtiny85_noSerial.ino b/examples/PulseSensor_ATtiny85_noSerial/PulseSensor_ATtiny85_noSerial.ino
index de1b83a..5edd069 100644
--- a/examples/PulseSensor_ATtiny85_noSerial/PulseSensor_ATtiny85_noSerial.ino
+++ b/examples/PulseSensor_ATtiny85_noSerial/PulseSensor_ATtiny85_noSerial.ino
@@ -23,7 +23,7 @@
    Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use
    interrupts to automatically read and process PulseSensor data.
 
-   See ProcessEverySample.ino for an example of not using interrupts.
+   See PulseSensor_BPM_Alternative.ino for an example of not using interrupts.
 */
 #define USE_ARDUINO_INTERRUPTS true
 #include <PulseSensorPlayground.h>
diff --git a/examples/PulseSensor_BPM/PulseSensor_BPM.ino b/examples/PulseSensor_BPM/PulseSensor_BPM.ino
index 4c641dd..96264f1 100644
--- a/examples/PulseSensor_BPM/PulseSensor_BPM.ino
+++ b/examples/PulseSensor_BPM/PulseSensor_BPM.ino
@@ -23,7 +23,7 @@
    Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use
    interrupts to automatically read and process PulseSensor data.
 
-   See ProcessEverySample.ino for an example of not using interrupts.
+   See PulseSensor_BPM_Alternative.ino for an example of not using interrupts.
 */
 #define USE_ARDUINO_INTERRUPTS true
 #include <PulseSensorPlayground.h>
diff --git a/examples/PulseSensor_BPM_UNO_R4/PulseSensor_BPM_UNO_R4.ino b/examples/PulseSensor_BPM_UNO_R4/PulseSensor_BPM_UNO_R4.ino
new file mode 100644
index 0000000..143a969
--- /dev/null
+++ b/examples/PulseSensor_BPM_UNO_R4/PulseSensor_BPM_UNO_R4.ino
@@ -0,0 +1,174 @@
+/*
+   Code to detect pulses from the PulseSensor,
+   using an interrupt service routine.
+
+>>>>  This example targest the Arduino UNO R4.
+>>>>  It has been tested on the Minima and the WiFi board variants.
+
+   Here is a link to the tutorial
+   https://pulsesensor.com/pages/getting-advanced
+
+   Copyright World Famous Electronics LLC - see LICENSE
+   Contributors:
+     Joel Murphy, https://pulsesensor.com
+     Yury Gitman, https://pulsesensor.com
+     Bradford Needham, @bneedhamia, https://bluepapertech.com
+
+   Licensed under the MIT License, a copy of which
+   should have been included with this software.
+
+   This software is not intended for medical use.
+*/
+
+/*
+   We use the FspTimer to setup a timer interrupt for sample acquisition
+   FspTimer is part of the hardware core files for this chip 
+*/
+#include "FspTimer.h"
+FspTimer sampleTimer;
+
+
+/*
+   Every Sketch that uses the PulseSensor Playground must
+   define USE_ARDUINO_INTERRUPTS before including PulseSensorPlayground.h.
+   Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use
+   interrupts to automatically read and process PulseSensor data.
+
+   See PulseSensorBPM_Alternative.ino for an example of not using interrupts.
+*/
+#define USE_ARDUINO_INTERRUPTS true
+#include <PulseSensorPlayground.h>
+
+/*
+  This is the timer interrupt service routine where we acquire and process samples
+*/
+void sampleTimerISR(timer_callback_args_t __attribute((unused)) *p_args){
+  PulseSensorPlayground::OurThis->onSampleTime();
+}
+
+/*
+   The format of our output.
+
+   Set this to PROCESSING_VISUALIZER if you're going to run
+    the Processing Visualizer Sketch.
+    See https://github.com/WorldFamousElectronics/PulseSensor_Amped_Processing_Visualizer
+
+   Set this to SERIAL_PLOTTER if you're going to run
+    the Arduino IDE's Serial Plotter.
+*/
+const int OUTPUT_TYPE = SERIAL_PLOTTER;
+
+/*
+   Pinout:
+     PULSE_INPUT = Analog Input. Connected to the pulse sensor
+      purple (signal) wire.
+     PULSE_BLINK = digital Output. Connected to an LED (and 1K series resistor)
+      that will flash on each detected pulse.
+     PULSE_FADE = digital Output. PWM pin onnected to an LED (and 1K series resistor)
+      that will smoothly fade with each pulse.
+      NOTE: PULSE_FADE must be a pin that supports PWM. Do not use
+      pin 9 or 10, because those pins' PWM interferes with the sample timer.
+     THRESHOLD should be set higher than the PulseSensor signal idles
+      at when there is nothing touching it. The expected idle value
+      should be 512, which is 1/2 of the ADC range. To check the idle value
+      open a serial monitor and make note of the PulseSensor signal values
+      with nothing touching the sensor. THRESHOLD should be a value higher
+      than the range of idle noise by 25 to 50 or so. When the library
+      is finding heartbeats, the value is adjusted based on the pulse signal
+      waveform. THRESHOLD sets the default when there is no pulse present.
+      Adjust as neccesary.
+*/
+const int PULSE_INPUT = A0;
+const int PULSE_BLINK = LED_BUILTIN;
+const int PULSE_FADE = 5;
+const int THRESHOLD = 550;   // Adjust this number to avoid noise when idle
+
+/*
+   All the PulseSensor Playground functions.
+*/
+PulseSensorPlayground pulseSensor;
+
+void setup() {
+  /*
+     Use 115200 baud because that's what the Processing Sketch expects to read,
+     and because that speed provides about 11 bytes per millisecond.
+
+     If we used a slower baud rate, we'd likely write bytes faster than
+     they can be transmitted, which would mess up the timing
+     of readSensor() calls, which would make the pulse measurement
+     not work properly.
+  */
+  Serial.begin(115200);
+
+  // Configure the PulseSensor manager.
+
+  pulseSensor.analogInput(PULSE_INPUT);
+  pulseSensor.blinkOnPulse(PULSE_BLINK);
+  pulseSensor.fadeOnPulse(PULSE_FADE);
+
+  pulseSensor.setSerial(Serial);
+  pulseSensor.setOutputType(OUTPUT_TYPE);
+  pulseSensor.setThreshold(THRESHOLD);
+
+  // Now that everything is ready, start reading the PulseSensor signal.
+  if (!pulseSensor.begin()) {
+    /*
+       PulseSensor initialization failed,
+       likely because our particular Arduino platform interrupts
+       aren't supported yet.
+
+       If your Sketch hangs here, try PulseSensor_BPM_Alternative.ino,
+       which doesn't use interrupts.
+    */
+    for(;;) {
+      // Flash the led to show things didn't work.
+      digitalWrite(PULSE_BLINK, LOW);
+      delay(50); Serial.println('!');
+      digitalWrite(PULSE_BLINK, HIGH);
+      delay(50);
+    }
+  }
+
+/*
+  We have to get control of a timer on the R4. First, we try and see if there are any free timers available.
+  If there are no free timers available, we will just take control of one from some other purpose. 
+  We shouldn't have to force things, but if you use alot of timers, beware of this force use code!
+*/
+  uint8_t timer_type = GPT_TIMER;
+  int8_t tindex = FspTimer::get_available_timer(timer_type);
+  if(tindex == 0){
+    FspTimer::force_use_of_pwm_reserved_timer();
+    tindex = FspTimer::get_available_timer(timer_type);
+  }
+
+/*
+  Begin sets up the timer that we just got control of as a periodic timer with 500Hz frequency.
+  It also passes the interrupt service routine that we made above. 
+*/
+  sampleTimer.begin(TIMER_MODE_PERIODIC, timer_type, tindex, SAMPLE_RATE_500HZ, 0.0f, sampleTimerISR);
+  sampleTimer.setup_overflow_irq();
+  sampleTimer.open();
+  sampleTimer.start();
+}
+
+void loop() {
+  /*
+     Wait a bit.
+     We don't output every sample, because our baud rate
+     won't support that much I/O.
+  */
+  delay(20);
+
+  // write the latest sample to Serial.
+ pulseSensor.outputSample();
+
+  /*
+     If a beat has happened since we last checked,
+     write the per-beat information to Serial.
+   */
+  if (pulseSensor.sawStartOfBeat()) {
+   pulseSensor.outputBeat();
+  }
+
+}
+
diff --git a/examples/PulseSensor_RP2040/PulseSensor_RP2040.ino b/examples/PulseSensor_RP2040/PulseSensor_RP2040.ino
index 52246ea..d621a38 100644
--- a/examples/PulseSensor_RP2040/PulseSensor_RP2040.ino
+++ b/examples/PulseSensor_RP2040/PulseSensor_RP2040.ino
@@ -41,7 +41,7 @@ RPI_PICO_Timer sampleTimer(0); // the paramater may need to change, depending?
    Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use
    interrupts to automatically read and process PulseSensor data.
 
-   See ProcessEverySample.ino for an example of not using interrupts.
+   See PulseSensor_BPM_Alternative.ino for an example of not using interrupts.
 */
 #define USE_ARDUINO_INTERRUPTS true
 #include <PulseSensorPlayground.h>
diff --git a/examples/PulseSensor_Servo/PulseSensor_Servo.ino b/examples/PulseSensor_Servo/PulseSensor_Servo.ino
index d630fd4..de61271 100644
--- a/examples/PulseSensor_Servo/PulseSensor_Servo.ino
+++ b/examples/PulseSensor_Servo/PulseSensor_Servo.ino
@@ -29,7 +29,7 @@
    Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use
    interrupts to automatically read and process PulseSensor data.
 
-   See ProcessEverySample.ino for an example of not using interrupts.
+   See PulseSensor_BPM_Alternative.ino for an example of not using interrupts.
 */
 #define USE_ARDUINO_INTERRUPTS true
 #include <PulseSensorPlayground.h>
diff --git a/examples/PulseSensor_Speaker/PulseSensor_Speaker.ino b/examples/PulseSensor_Speaker/PulseSensor_Speaker.ino
index 7d9bf94..f2a7c99 100644
--- a/examples/PulseSensor_Speaker/PulseSensor_Speaker.ino
+++ b/examples/PulseSensor_Speaker/PulseSensor_Speaker.ino
@@ -26,7 +26,7 @@
    Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use
    interrupts to automatically read and process PulseSensor data.
 
-   See ProcessEverySample.ino for an example of not using interrupts.
+   See PulseSensor_BPM_Alternative.ino for an example of not using interrupts.
 */
 #define USE_ARDUINO_INTERRUPTS true
 #include <PulseSensorPlayground.h>
diff --git a/examples/PulseSensor_nRF52/PulseSensor_nRF52.ino b/examples/PulseSensor_nRF52/PulseSensor_nRF52.ino
index aff22ad..1f167ac 100644
--- a/examples/PulseSensor_nRF52/PulseSensor_nRF52.ino
+++ b/examples/PulseSensor_nRF52/PulseSensor_nRF52.ino
@@ -59,7 +59,7 @@ NRF52Timer sampleTimer(NRF_TIMER_3);
    Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use
    interrupts to automatically read and process PulseSensor data.
 
-   See ProcessEverySample.ino for an example of not using interrupts.
+   See PulseSensor_BPM_Alternative.ino for an example of not using interrupts.
 */
 #define USE_ARDUINO_INTERRUPTS true
 #include <PulseSensorPlayground.h>
diff --git a/examples/PulseSensor_nRF52840_Feather_Express/PulseSensor_nRF52840_Feather_Express.ino b/examples/PulseSensor_nRF52840_Feather_Express/PulseSensor_nRF52840_Feather_Express.ino
index 7300193..4c614b2 100644
--- a/examples/PulseSensor_nRF52840_Feather_Express/PulseSensor_nRF52840_Feather_Express.ino
+++ b/examples/PulseSensor_nRF52840_Feather_Express/PulseSensor_nRF52840_Feather_Express.ino
@@ -78,7 +78,7 @@ BLEDis bledis;
    Here, #define USE_ARDUINO_INTERRUPTS true tells the library to use
    interrupts to automatically read and process PulseSensor data.
 
-   See ProcessEverySample.ino for an example of not using interrupts.
+   See PulseSensor_BPM_Alternative.ino for an example of not using interrupts.
 */
 #define USE_ARDUINO_INTERRUPTS true
 #include <PulseSensorPlayground.h>
diff --git a/library.properties b/library.properties
index bb5d225..920182d 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=PulseSensor Playground
-version=1.8.2
+version=1.9.0
 author=Joel Murphy, Yury Gitman, Brad Needham
 maintainer=Joel Murphy, Yury Gitman
 sentence=Support at PulseSensor.com
diff --git a/src/PulseSensorPlayground.h b/src/PulseSensorPlayground.h
index 4a664e1..edf1a52 100644
--- a/src/PulseSensorPlayground.h
+++ b/src/PulseSensorPlayground.h
@@ -133,6 +133,10 @@
 #if defined(ARDUINO_ARCH_NRF52)
 #include "Adafruit_TinyUSB.h"
 #endif
+// #if defined(ARDUINO_ARCH_RENESAS)
+// #include "FspTimer.h"
+// FspTimer sampleTimer
+// #endif
 #include <Arduino.h>
 #include "utility/PulseSensor.h"
 #if USE_SERIAL
@@ -140,6 +144,8 @@
 #endif
 #include "utility/PulseSensorTimingStatistics.h"
 
+#define SAMPLE_RATE_500HZ 500
+
 class PulseSensorPlayground {
   public:
     /*
@@ -464,6 +470,12 @@ class PulseSensorPlayground {
 #if PULSE_SENSOR_TIMING_ANALYSIS   // Don't use ram and flash we don't need.
     PulseSensorTimingStatistics *pTiming;
 #endif // PULSE_SENSOR_TIMING_ANALYSIS
+
+#if defined(ARDUINO_ARCH_RENESAS)
+    uint8_t timer_type;
+    int8_t tindex;
+#endif
+
 };
 
 /*
diff --git a/src/utility/Interrupts.h b/src/utility/Interrupts.h
index 0adadc7..b05ae4d 100644
--- a/src/utility/Interrupts.h
+++ b/src/utility/Interrupts.h
@@ -65,7 +65,7 @@
 #if defined(__arc__)||(ARDUINO_SAMD_MKR1000)||(ARDUINO_SAMD_MKRZERO)||(ARDUINO_SAMD_ZERO)\
 ||(ARDUINO_ARCH_SAMD)||(ARDUINO_ARCH_STM32)||(ARDUINO_STM32_STAR_OTTO)||(ARDUINO_ARCH_NRF52)\
 ||(ARDUINO_NANO33BLE)||(ARDUINO_ARCH_RP2040)||(ARDUINO_ARCH_ESP32)||(ARDUINO_ARCH_MBED_NANO)\
-||(ARDUINO_ARCH_NRF52840)||(ARDUINO_ARCH_SAM)
+||(ARDUINO_ARCH_NRF52840)||(ARDUINO_ARCH_SAM)||(ARDUINO_ARCH_RENESAS)
 
 #define DISABLE_PULSE_SENSOR_INTERRUPTS
 #define ENABLE_PULSE_SENSOR_INTERRUPTS
@@ -254,6 +254,10 @@ boolean PulseSensorPlaygroundSetupInterrupt() {
     result = true;
   #endif
 
+  #if defined(ARDUINO_ARCH_RENESAS)
+    result = true;
+  #endif
+
 #endif // USE_ARDUINO_INTERRUPTS
 
   return result;
@@ -320,8 +324,14 @@ boolean PulseSensorPlaygroundDisableInterrupt(){
     result = true;
   #endif
 
+  #if defined(ARDUINO_ARCH_RENESAS)
+    sampleTimer.stop();
+  #endif
+
 #endif
 
+
+
 return result;      // unknown or unsupported platform.
 } // PulseSensorPlaygroundDisableInterrupt
 
@@ -388,6 +398,10 @@ boolean PulseSensorPlaygroundEnableInterrupt(){
     result = true;
   #endif
 
+  #if defined(ARDUINO_ARCH_RENESAS)
+    sampleTimer.start();
+  #endif
+
 #endif
     
 return result;      // unknown or unsupported platform.
@@ -472,7 +486,12 @@ return result;      // unknown or unsupported platform.
 		// Interrupts not supported yet for Teensy
 	#endif
 
-  
+  // #if defined(ARDUINO_ARCH_RENESAS)
+	// 		void sampleTimerISR(timer_callback_args_t __attribute((unused)) *p_args)
+	// 		{
+	// 			PulseSensorPlayground::OurThis->onSampleTime();
+	// 		}
+	// #endif
 
 
 #endif // USE_ARDUINO_INTERRUPTS