Added a list of possible accelerometers to choose from

README.md

@@ -2,23 +2,33 @@
 ## Why this project :
 
 ## A Smart Watch project using the Chinese W800 SOC.
-The W800 is a pretty interesting chip with impressive characterics :  
-Core :  
-* 32bit XT804
-* 240 Mhz frequency
-Memory :
-* 2 MB on board flash
-* 288 KB RAM
-Wireless :
+The W800 is a pretty interesting chip with impressive characteristics :    
+### Core :  
+* 32bit XT804 CPU
+* 240 Mhz frequency  
+### Memory :
+* 2 MB on chip flash
+* 288 KB RAM  
+### Wireless connectivity :
 * Bluetooth EDR(Classic) and BLE 4.2
 * WiFi 2.4Ghz 802.11 b/g/n
 
 
 ## Sensors :
 The goal is to embed the following sensors in the watch :
-* An accelerometer (for wrist tilt detection, single and double tap detection and more)
+* An accelerometer (for wrist tilt detection, single and double tap detection , foot step counting and more)
+Possible choices :
+    * ADXL345
+    * MPU6050
+    * BMI160
+    * LSM6DS3
+
 * A magnetometer
-* An air pressure/temperature sensor
+* An air pressure/temperature sensor (to display the altitude for example)
+    * BMP280
+
+## Actuators :
+* A vibration motor to notify events to the user.
 
 ## MCU Pin assignement table :
 | Pin Number | Pin Name | Type | Function | Pull UP/DOWN| Connected to | Comment |