Update README.md

README.md

@@ -1,5 +1,29 @@
 # UniSeb8266
-Universal Sensorboard with ESP8266
+Universal Sensorboard with ESP8266.
+
+## Usage
+### Tasmota
+UniSeb8266 is designed to operate with Tasmota. Use the following template string:
+```
+{"NAME":"UniSeb8266","GPIO":[640,0,608,0,352,1312,0,0,0,1760,1,1728,1,0],"FLAG":0,"BASE":18}
+```
+### Power sources
+There are different options to power the board:
+| power source           | SJ1 jumper position |
+| ---------------------- | ------------------- |
+| HLK-PM01 230V-Module   | 'module'            |
+| RT9400 PoE-Module      | 'module'            |
+| 5V connector           | 'connector'         |
+| D1-Mini USB connector  | no jumper required  |
+
+### 3-pin connector J1
+Use SJ2 to change usage of pin2:
+| pin 2 utilization | SJ2 jumper position |
+| ----------------- | ------------------- |
+| 3.3V              | '3V3'               |
+| gpio D5           | 'D5'                |
+
+Pin3 is fixed to D0.
 
 ## Examples
 PM sensor mounted on diy box