diff --git a/AltSoftSerial.cpp b/AltSoftSerial.cpp
index 916d056..91661e0 100644
--- a/AltSoftSerial.cpp
+++ b/AltSoftSerial.cpp
@@ -1,17 +1,17 @@
 /* An Alternative Software Serial Library
  * http://www.pjrc.com/teensy/td_libs_AltSoftSerial.html
  * Copyright (c) 2014 PJRC.COM, LLC, Paul Stoffregen, paul@pjrc.com
- * 
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
- * 
+ *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@@ -59,7 +59,7 @@ static volatile uint8_t tx_buffer_head;
 static volatile uint8_t tx_buffer_tail;
 #define TX_BUFFER_SIZE 68
 static volatile uint8_t tx_buffer[TX_BUFFER_SIZE];
-
+static bool invert = false;
 
 #ifndef INPUT_PULLUP
 #define INPUT_PULLUP INPUT
@@ -67,6 +67,16 @@ static volatile uint8_t tx_buffer[TX_BUFFER_SIZE];
 
 #define MAX_COUNTS_PER_BIT  6241  // 65536 / 10.5
 
+AltSoftSerial::AltSoftSerial(bool inverse)
+{
+    invert = inverse;
+}
+
+AltSoftSerial::AltSoftSerial(uint8_t rxPin, uint8_t txPin, bool inverse = false)
+{
+    invert = inverse;
+}
+
 void AltSoftSerial::init(uint32_t cycles_per_bit)
 {
 	//Serial.printf("cycles_per_bit = %d\n", cycles_per_bit);
@@ -102,8 +112,12 @@ void AltSoftSerial::init(uint32_t cycles_per_bit)
 	ticks_per_bit = cycles_per_bit;
 	rx_stop_ticks = cycles_per_bit * 37 / 4;
 	pinMode(INPUT_CAPTURE_PIN, INPUT_PULLUP);
-	digitalWrite(OUTPUT_COMPARE_A_PIN, HIGH);
 	pinMode(OUTPUT_COMPARE_A_PIN, OUTPUT);
+    if (invert) {
+        digitalWrite(OUTPUT_COMPARE_A_PIN, LOW);
+    } else {
+        digitalWrite(OUTPUT_COMPARE_A_PIN, HIGH);
+    } // if-else invert
 	rx_state = 0;
 	rx_buffer_head = 0;
 	rx_buffer_tail = 0;
@@ -145,7 +159,11 @@ void AltSoftSerial::writeByte(uint8_t b)
 		tx_byte = b;
 		tx_bit = 0;
 		ENABLE_INT_COMPARE_A();
-		CONFIG_MATCH_CLEAR();
+        if (invert) {
+            CONFIG_MATCH_SET();
+        } else {
+            CONFIG_MATCH_CLEAR();
+        } //if-else invert
 		SET_COMPARE_A(GET_TIMER_COUNT() + 16);
 	}
 	SREG = intr_state;
@@ -170,9 +188,17 @@ ISR(COMPARE_A_INTERRUPT)
 		state++;
 		if (bit != tx_bit) {
 			if (bit) {
-				CONFIG_MATCH_SET();
+                if (invert) {
+                    CONFIG_MATCH_CLEAR();
+                } else {
+                    CONFIG_MATCH_SET();
+                } //if-else invert
 			} else {
-				CONFIG_MATCH_CLEAR();
+                if (invert) {
+                    CONFIG_MATCH_SET();
+                } else {
+                    CONFIG_MATCH_CLEAR();
+                } //if-else invert
 			}
 			SET_COMPARE_A(target);
 			tx_bit = bit;
@@ -199,7 +225,11 @@ ISR(COMPARE_A_INTERRUPT)
 		tx_buffer_tail = tail;
 		tx_byte = tx_buffer[tail];
 		tx_bit = 0;
-		CONFIG_MATCH_CLEAR();
+        if (invert) {
+            CONFIG_MATCH_SET();
+        } else {
+            CONFIG_MATCH_CLEAR();
+        } //if-else invert
 		if (state == 10)
 			SET_COMPARE_A(target + ticks_per_bit);
 		else
@@ -228,10 +258,18 @@ ISR(CAPTURE_INTERRUPT)
 	capture = GET_INPUT_CAPTURE();
 	bit = rx_bit;
 	if (bit) {
-		CONFIG_CAPTURE_FALLING_EDGE();
+        if (invert) {
+            CONFIG_CAPTURE_RISING_EDGE();
+        } else {
+            CONFIG_CAPTURE_FALLING_EDGE();
+        } //if-else invert;
 		rx_bit = 0;
 	} else {
-		CONFIG_CAPTURE_RISING_EDGE();
+        if (invert) {
+            CONFIG_CAPTURE_FALLING_EDGE();
+        } else {
+            CONFIG_CAPTURE_RISING_EDGE();
+        } //if-else invert
 		rx_bit = 0x80;
 	}
 	state = rx_state;
@@ -260,7 +298,11 @@ ISR(CAPTURE_INTERRUPT)
 					rx_buffer[head] = rx_byte;
 					rx_buffer_head = head;
 				}
-				CONFIG_CAPTURE_FALLING_EDGE();
+                if (invert) {
+                    CONFIG_CAPTURE_RISING_EDGE();
+                } else {
+                    CONFIG_CAPTURE_FALLING_EDGE();
+                } //if-else invert
 				rx_bit = 0;
 				rx_state = 0;
 				return;
@@ -277,7 +319,11 @@ ISR(COMPARE_B_INTERRUPT)
 	uint8_t head, state, bit;
 
 	DISABLE_INT_COMPARE_B();
-	CONFIG_CAPTURE_FALLING_EDGE();
+    if (invert) {
+        CONFIG_CAPTURE_RISING_EDGE();
+    } else {
+        CONFIG_CAPTURE_FALLING_EDGE();
+    } //if-else invert
 	state = rx_state;
 	bit = rx_bit ^ 0x80;
 	while (state < 9) {
@@ -291,7 +337,11 @@ ISR(COMPARE_B_INTERRUPT)
 		rx_buffer_head = head;
 	}
 	rx_state = 0;
-	CONFIG_CAPTURE_FALLING_EDGE();
+    if (invert) {
+        CONFIG_CAPTURE_RISING_EDGE();
+    } else {
+        CONFIG_CAPTURE_FALLING_EDGE();
+    } //if-else invert
 	rx_bit = 0;
 }
 
@@ -332,7 +382,7 @@ int AltSoftSerial::available(void)
 }
 
 int AltSoftSerial::availableForWrite(void)
-{ 
+{
 	uint8_t head, tail;
 	head = tx_buffer_head;
 	tail = tx_buffer_tail;
diff --git a/AltSoftSerial.h b/AltSoftSerial.h
index 7860fdd..38aaa74 100644
--- a/AltSoftSerial.h
+++ b/AltSoftSerial.h
@@ -1,17 +1,17 @@
 /* An Alternative Software Serial Library
  * http://www.pjrc.com/teensy/td_libs_AltSoftSerial.html
  * Copyright (c) 2014 PJRC.COM, LLC, Paul Stoffregen, paul@pjrc.com
- * 
+ *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
- * 
+ *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
- * 
+ *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
@@ -43,6 +43,7 @@ class AltSoftSerial : public Stream
 {
 public:
 	AltSoftSerial() { }
+  AltSoftSerial(bool inverse);
 	~AltSoftSerial() { end(); }
 	static void begin(uint32_t baud) { init((ALTSS_BASE_FREQ + baud / 2) / baud); }
 	static void end();
@@ -61,7 +62,7 @@ class AltSoftSerial : public Stream
 	static void flushInput();
 	static void flushOutput();
 	// for drop-in compatibility with NewSoftSerial, rxPin & txPin ignored
-	AltSoftSerial(uint8_t rxPin, uint8_t txPin, bool inverse = false) { (void)rxPin; (void)txPin; (void)inverse; }
+  //	AltSoftSerial(uint8_t rxPin, uint8_t txPin, bool inverse = false);
 	bool listen() { return false; }
 	bool isListening() { return true; }
 	bool overflow() { bool r = timing_error; timing_error = false; return r; }