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- # Espurna
-
- Espurna ("spark" in Catalan) is a custom C firmware for [ITead Sonoff][1] Smart WiFi Switch.
- This device has an ESP8266 on board with a 8Mbit flash memory chip, a mains to 3V3 transformer
- and a relay (GPIO12). It also features a button (GPIO0), a LED (GPIO13) and an unpopulated header you can use to reprogram it.
-
- ## Features
-
- * WebServer for configuration and simple relay toggle
- * Flashing firmware Over-The-Air (OTA)
- * Up to 3 configurable WIFI networks
- * MQTT support with configurable host and topic
- * Manual switch ON/OFF with button
- * Visual status of the connection via the LED
-
- ## Flashing
-
- The unpopulated header has all the required pins. My board has a 5 pins header
- in-line with the button. They are (from the button outwards):
-
- * 3V3
- * RX
- * TX
- * GND
- * GPIO14
-
- Last one is not necessary. Mind it's a **3V3 device**, if connected to 5V you will
- probably fry it. Button is connected to GPIO0 on the ESP8266 chip, so to enter
- flash mode you have to hold the button pressed while powering on the board, then
- you can realease it again.
-
- The project is ready to be build using [PlatformIO][2].
- Please refer to their web page for instructions on how to install the builder.
- Once installed:
-
- ```bash
- > platformio run --target upload -e wire
- > platformio run --target uploadfs -e wire
- ```
-
- Once you have flashed it you can flash it again over-the-air using the ```ota``` environment:
-
- ```bash
- > platformio run --target upload -e ota
- > platformio run --target uploadfs -e ota
- ```
-
- Library dependencies are automatically managed via PlatformIO Library Manager.
-
- ## Usage
-
- On normal boot (i.e. button not pressed) it will execute the firmware.
- It configures the hardware (button, LED, relay), the SPIFFS memory access, the
- WIFI, the WebServer and MQTT connection.
-
- Obviously the default values for WIFI network and MQTT will probably not match
- your requirements. Either it connects to a WiFi or not, it will set up a Soft AP
- named "SONOFF_XXXX", where XXXX are the las 2 bytes of the radio MAC. Connect with
- phone, PC, laptop, whatever to that network, password is "fibonacci". Once connected
- browse to 192.168.4.1 and you will be presented a configuration page where you will
- be able to define up to 3 possible WIFI networks and the MQTT configuration parameters.
-
- It will then try to connect to the first WIFI network. If fail it will try the second
- in 30 seconds, and so on. Once connected it will try to connect the MQTT server.
-
- The device will publish the relay state to the given topic and it will subscribe to
- the same topic plus "/set" for remote switching. So if your topic is "/home/living/switch"
- you will be able to switch it on/off sending "1"/"0" to "/home/living/switch/set".
-
- You can also use "{identifier}" as place holder in the topic. It will be translated to
- your device ID (same as the soft AP network it creates).
-
-
- [1]: https://www.itead.cc/sonoff-wifi-wireless-switch.html
- [2]: http://www.platformio.org
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