Update README.md for v1.1.0

Author: HuibSmeets

README.md

@@ -6,7 +6,7 @@ Image: Prototype, work in progress
 
 ## Description
 
-**PulseFlow** is a small Arduino sketch that connects via BLE to a HR fitness sensor like those from Garmin, Wahoo and others. The fan is connected to a PWM controllable AC dimmer. These AC dimmers can be sourced from marketplaces like AliExpress.
+**PulseFlow** is a small Arduino sketch that connects via BLE to a HR fitness sensor like those from Garmin, Wahoo and others. The fan is connected to a PWM controllable AC dimmer or a dimmer that exposes 2 pins: Output Zerocross detection, input triac trigger. These AC dimmers can be sourced from marketplaces like AliExpress.
 
 ## Warning
 BE AWARE THAT YOU'LL BE WORKING WITH DEADLY LIVE VOLTAGES. TAKE APPROPRIATE SAFETY MEASURES WHEN CONNECTING PARTS AND WHILE USING THE DEVICE YOU CREATED. 
@@ -17,16 +17,27 @@ BE AWARE THAT YOU'LL BE WORKING WITH DEADLY LIVE VOLTAGES. TAKE APPROPRIATE SAFE
 + Sensor pairing is hardcoded, see the sourcecode
 + Use a fan that has no electronic speed control of it's own.
 + The HR to fan speed mapping is hardcoded, see the sourcecode
-+ The PWM signal is available on pin D6 (Arduino numbering)
-+ The PWM signal is not generated by analogWrite as the standard PWM frequency is too high for the AC Dimmer I used
-+ **The PWM related code is therefore specific for an Arduino NANO 33 BLE rev2** (but should be easy to adapt)
++ In case of a PWM controlled dimmer:
+  + The PWM signal is available on pin D6 (Arduino numbering)
+  + Code to generate the PWM is Nano 33 BLE specific
++ In case of zero-cross/triac trigger dimmer:
+  + Pin 2 (Arduino numbering) is used to detect the zero-crossing (interupt)
+  + The triac trigger pulse is available on pin D6 (Arduino numbering)
+  + The delay implementation between the zero-crossing and the triactrigger is Nano 33 BLE specific
 + As the NANO is a 3.3V device the AC dimmer you use must be 3.3v tolerable/compatible (or add levelshifting)
 + Installing the various parts in a metal of shielded housing can influense the BLE RF signal
 
 ## Possible enhancements
 
-+ Support different AC dimmer (not the PWM controlled one's)
 + Battery check as far as exposed (Garmin does on the HRM Dual)
 + Do away with hardcoded pairing
 + Create an UI (e.g. a 2-Line display and rotary encoder) for pairing, map settings. 
 + Alternate fan speed mapping methods (speed, power,...).
+
+## Change Log
+
+### v1.0.0
++ Initial release
+
+### v1.1.0
++ added code for 2nd type of dimmer