reduced 2500 bitrate speed to eliminate errors with calib. tiny

changed delay in example to delayMicroseconds

README.md

@@ -9,9 +9,9 @@ The transmitter code is small in size making it suitable for microcontrollers wi
 ## Features
 * Built-in error checking
 * Built-in sequence numbering
-* Data transmission speeds up to 1000bps (2500bps with calibrated clock)
+* Data transmission speeds up to 1000bps (2000bps with calibrated oscillator)
 * Ability to disable features in order to preserve memory space
-* Small memory footprint: 176 bytes Flash, 1 byte RAM with all features enabled. (Using [MicroCore](https://github.com/MCUdude/MicroCore) with LTO enabled)
+* Small memory footprint: 176 bytes Flash, 1 byte RAM with all features enabled
 
 **Transmitter MCU support:** ATtiny13 or any other AVR microcontroller you can program with Arduino IDE.
 
@@ -61,7 +61,7 @@ void loop(){
   // it is socially more responsible to use fewer repetition to minimize your usage of the bandwidth
   sendMulti((byte*)msg, strlen(msg), 10);
 
-  delay(1000);
+  delayMicroseconds(TX_DELAY_MICROS);
 
 }
 ```

examples/Transmitter/Transmitter.ino

@@ -26,6 +26,6 @@ void loop(){
   // it is socially more responsible to use fewer repetition to minimize your usage of the bandwidth
   sendMulti((byte*)msg, strlen(msg), 10);
 
-  delay(1000);
+  delayMicroseconds(TX_DELAY_MICROS);
 
 }

src/Settings.h

@@ -43,14 +43,14 @@
 /**
  * Data rate presets
  * 
- * Available presets are: TRF_BITRATE_200, TRF_BITRATE_500, TRF_BITRATE_1000, TRF_BITRATE_2500
+ * Available presets are: TRF_BITRATE_200, TRF_BITRATE_500, TRF_BITRATE_1000, TRF_BITRATE_2000
  * These speeds are estimated speeds, they aren't accurate
  * 
  * According to the datasheet uncalibrated ATtiny13 has 10% frequency error.
  * We also need at least 30us of error margin because we use delayMicroseconds() which isn't super accurate.
  * So if our 0 pulse period is 500 then our error margin is 500-50-30 to 500+50+30
  * In my experience TRF_BITRATE_1000 was a good option with ATtiny13 as TX
- * If you are using an Arduino as TX you can go up to TRF_BITRATE_2500 speed.
+ * If you are using an Arduino as TX you can go up to TRF_BITRATE_2000 speed.
  * If you need custom speeds you can define one for yourself in the header file "TinyRF.h"
  *
  * Preabmle:

src/TinyRF.h

@@ -89,15 +89,15 @@
 	const uint16_t NUM_PREAMBLE_BYTES = 15;
 #endif
 
-#ifdef TRF_BITRATE_2500
+#ifdef TRF_BITRATE_2000
 	#ifdef TRF_TX_UNCALIBRATED
 		#warning "This data rate is too fast for an uncalibrated ATtiny."
 	#endif
 	const uint16_t START_PULSE_PERIOD = 1998;
-	const uint16_t ONE_PULSE_PERIOD = 400;
-	const uint16_t ZERO_PULSE_PERIOD = 300;
-	const uint16_t PERIOD_HIGH_DURATION = 200;
-	const uint16_t TX_INTERVAL_CONST = 8001;
+	const uint16_t ONE_PULSE_PERIOD = 601;
+	const uint16_t ZERO_PULSE_PERIOD = 451;
+	const uint16_t PERIOD_HIGH_DURATION = 298;
+	const uint16_t TX_INTERVAL_CONST = 8002;
 	const uint16_t TRIGGER_ERROR = 30;
 	const uint16_t NUM_PREAMBLE_BYTES = 30;
 #endif