add IDs and more docs

Author: f18m

README.md

@@ -128,6 +128,13 @@ which is basically assigning the secrets defined in the ESPHome global "secrets.
 Then it's overriding just the name & friendly name from the package.
 
 
+## TODO
+
+Write the [external component](https://esphome.io/components/external_components/) that will make it possible
+to control relays using the local temp sensor when connection to HA fails.
+
+
+
 ## Similar projects
 
 * [Smart Underfloor Heating Controller](https://hackaday.io/project/190828-smart-underfloor-heating-controller)

images/ESP-to-sensors-connections.drawio

@@ -0,0 +1 @@
+<mxGraphModel><root><mxCell id="0"/><mxCell id="1" parent="0"/></root></mxGraphModel>

images/overview.drawio

@@ -61,6 +61,7 @@ spi:
 sensor:
   # Temperature sensor on SPI, see https://esphome.io/components/sensor/max6675/
   - platform: max6675
+    id: heating_pipe_sensor
     name: "Heating pipe Temperature"
     cs_pin: GPIO15
     update_interval: 60s
@@ -71,6 +72,7 @@ sensor:
     update_interval: 60s
 
   - platform: dht
+    id: ambient_sensor
     pin: GPIO5
     model: DHT11
     temperature: