readme update

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+++ b/README.md
@@ -2,7 +2,7 @@
 
 This is IM denrite module (remote wifi network device) created for [Interplay Medium™](https://interplaymedium.org) project.
 
-![Interplay Medium RGB Serial LED Dendrite](https://repository.interplaymedium.org/RGBW%20Controller/IM_RGBW_LED_dendrite.jpeg)
+![Interplay Medium RGB Serial LED Dendrite](https://repository.interplaymedium.org/Serial_RGB/IMG_2142.jpg)
 
 ## Pinouts 
 
@@ -11,6 +11,13 @@ For LEDs be sure to add MOSFETs and current limiting resistors appropriately. Wi
 ![ESP8266 Pinout](https://repository.interplaymedium.org/RGBW%20Controller/esppinout_.png)
 ![ESP8266 Programming](https://repository.interplaymedium.org/RGBW%20Controller/usbprogram_.png)
 
+## Bidirectional MOSFET level shifter
+
+To drive an addressable RGB strip along with ESP8266, you need to synchronize logical levels. 
+I usually use a simple MOSFET solution for single-channel shifting, hovever for multi-channel management, I would recommend using a simple Logic Gate IC like 74HC08 or a level shifter such as TXB0104.
+
+![Bidirectional MOSFET level shifter](https://repository.interplaymedium.org/Serial_RGB/bidirectonal-mosfet-level-shifter.png)
+
 ## Preparing the building environment
 
 Make sure that you have the environment installed as described at