Add note regarding temperature sensors

Author: glynhudson

readme.md

@@ -105,6 +105,8 @@ The WiFi gateway uses an **ESP32** which communicates with the OpenEVSE controll
 
 # Hardware 
 
+## WiFi Hardware
+
 Most ESP32 boards can be used (see platfromio.ini for full list of supported boards), however the boards which is best supported is the OpenEVSE WiFi V1. 
 
 **Be sure to correctly identify your WiFi hardware before updating the firmware**
@@ -116,6 +118,13 @@ Most ESP32 boards can be used (see platfromio.ini for full list of supported boa
 - OpenEVSE V1 - designed for V4.x firmware
 - [Olimex ESP32 Gateway (Wired Ethernet)](docs/wired-ethernet.md) - can run V3.x and V4.x firmware
 
+### Temperature sensors 
+
+- Temp 1 RTC temperature sensor (old LCD module with RTC)
+- Temp 2 MCP9808 temperature sensor (new LCD module )
+- Temp 3 IR sensor (not used)
+- Temp 4 is the sensor on the OpenEVSE V1 module (not currently used for throttling)
+
 ## WiFi Setup
 
 On first boot, OpenEVSE should broadcast a WiFi access point (AP) `OpenEVSE_XXXX`. Connect your browser device to this AP (default password: `openevse`) and the [captive portal](https://en.wikipedia.org/wiki/Captive_portal) should forward you to the log-in page. If this does not happen, navigate to [http://openevse](http://openevse), [http://openevse.local](http://openevse.local) or [http://192.168.4.1](http://192.168.4.1)