Updates

esphomeyaml/custom/custom_component.rst

@@ -24,8 +24,8 @@ The example below is an example of a custom component that can do anything you w
         pinMode(6, OUTPUT);
       }
       void loop() override {
-        // This will be called once to set up the component
-        // think of it as the setup() call in Arduino
+        // This will be called very often after setup time.
+        // think of it as the loop() call in Arduino
         if (digitalRead(5)) {
           digitalWrite(6, HIGH);
 

esphomeyaml/custom/i2c.rst

@@ -0,0 +1,38 @@
+Custom I²C Device
+=================
+
+Lots of devices communicate using the i2c protocol. If you want to integrate
+a device into esphomelib that uses this protocol you can pretty much use almost
+all Arduino-based code, since the ``Wire`` library is also available in esphomelib.
+
+See the other custom component guides for how to register components and make
+them publish values.
+
+.. code-block:: cpp
+
+    #include "esphomelib.h"
+    using namespace esphomelib;
+
+    class MyCustomComponent : public Component {
+     public:
+      void setup() override {
+        // Initialize the device here. Usually Wire.begin() will be called in here,
+        // though that call is unnecessary if you have an 'i2c:' entry in your config
+
+        Wire.begin();
+      }
+      void loop() override {
+        // Example: write the value 0x42 to register 0x78 of device with address 0x21
+        Wire.beginTransmission(0x21);
+        Wire.write(0x78);
+        Wire.write(0x42);
+        Wire.endTransmission();
+      }
+    };
+
+See Also
+--------
+
+- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/custom/i2c.rst>`__
+
+.. disqus::

esphomeyaml/custom/spi.rst

@@ -0,0 +1,38 @@
+Custom SPI Device
+=================
+
+Lots of devices communicate using the i2c protocol. If you want to integrate
+a device into esphomelib that uses this protocol you can pretty much use almost
+all Arduino-based code, since the ``Wire`` library is also available in esphomelib.
+
+See the other custom component guides for how to register components and make
+them publish values.
+
+.. code-block:: cpp
+
+    #include "esphomelib.h"
+    using namespace esphomelib;
+
+    class MyCustomComponent : public Component {
+     public:
+      void setup() override {
+        // Initialize the device here. Usually Wire.begin() will be called in here,
+        // though that call is unnecessary if you have an 'i2c:' entry in your config
+
+        Wire.begin();
+      }
+      void loop() override {
+        // Example: write the value 0x42 to register 0x78 of device with address 0x21
+        Wire.beginTransmission(0x21);
+        Wire.write(0x78);
+        Wire.write(0x42);
+        Wire.endTransmission();
+      }
+    };
+
+See Also
+--------
+
+- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/custom/i2c.rst>`__
+
+.. disqus::

esphomeyaml/guides/configuration-types.rst

@@ -141,6 +141,34 @@ There are several ways of doing this. See below examples to see how you can spec
       update_interval: never  # never update
       update_interval: 0ms  # update in every loop() iteration
 
+.. _config-substitutions:
+
+Substitutions
+-------------
+
+If you're using many ESPs in your home and have many similar configuration files, it can
+be cumbersome to keep all files up to date. There are already some ways to minimize
+repeating yourself in the configuration using the ``!include`` and ``!secret`` YAML
+directives.
+
+If you want to go one step further and reduce duplication even further, you can use
+``substitutions`` in esphomeyaml's config. Substitutions allow you define top-level
+variables which are then replaced everywhere in your configuration which are then
+substituted with their value using the bash-style ``${}`` syntax.
+
+.. code-block:: yaml
+
+    substitutions:
+      devicename: livingroom
+
+    esphomeyaml:
+      name: $devicename
+      # ...
+
+    switch:
+    - platform: ...
+      name: ${devicename} switch
+
 See Also
 --------
 

esphomeyaml/guides/faq.rst

@@ -53,8 +53,9 @@ Starting with esphomelib 1.9.0, the esphomelib suite provides
 `esphomeflasher <https://github.com/OttoWinter/esphomeflasher>`__, a tool to flash ESPs over USB.
 
 First, you need to get the firmware file to flash. For Hass.io add-on based installs you can
-use the ``COMPILE`` button and then press ``Download Binary``. For command line based installs you
-can access the file under ``<CONFIG_DIR>/<NODE_NAME>/.pioenvs/<NODE_NAME>/firmware.bin``.
+use the ``COMPILE`` button (click the overflow icon with the three dots) and then press
+``Download Binary``. For command line based installs you can access the file under
+``<CONFIG_DIR>/<NODE_NAME>/.pioenvs/<NODE_NAME>/firmware.bin``.
 
 Then, install esphomeflasher by going to the `releases page <https://github.com/OttoWinter/esphomeflasher/releases>`__
 and downloading one of the pre-compiled binaries. Open up the application and select the serial port