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esp8266:sonoff_smart_wifi_switch [2017/12/26 16:00] ko4bb created |
esp8266:sonoff_smart_wifi_switch [2017/12/26 17:25] ko4bb |
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| ====== Sonoff Smart WiFi Switch ====== | ====== Sonoff Smart WiFi Switch ====== | ||
| - | The Sonoff Smart WiFi Switch is a very inexpensive (~$6 on Alibaba and ~$8 from US vendors (eBay or Amazon) WiFi controlled relay. | + | {{ :esp8266:sonoff_03.jpg?200 |}} |
| - | It operates directly from AC power (110 or 220) and drives a 10A relay. | + | |
| + | The Sonoff Smart WiFi Switch is a very inexpensive (~$6 on Alibaba and ~$8 from US vendors (eBay or Amazon) WiFi controlled relay. \\ | ||
| + | It operates directly from AC power (110 or 220) and drives a 10A relay. \\ | ||
| + | The main feature of the device is that it uses the ESP8266 System-on-Chip which integrates a WiFi radio and a 32 bit microcontroller on board. \\ | ||
| + | The ESP8266 can be programmed a number of different ways. The one I have experimented with is the Arduino IDE. More on that later. \\ | ||
| + | The Sonoff Switch is intended to be operated from an Android (and iPhone) app named Ewelink. I found the app very disturbing, the apk is about 35MB and the app asks for absolutely every permission possible on Android. It is not clear to me why a WiFi relay (On, Off people...) need to have access to my camera, microphone, phone book and so on, so the app had to go. \\ | ||
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| + | Which led me to experiment with the Arduino IDE to reprogram the chip. I have been waiting for a good opportunity to do something with the Arduino IDE, but the traditional Atmel based devices are not really appealing to me since I have a lot of experience and code for the 8051 (particularly those made by Silabs). The ESP8266 is in a different category and not being keen to have yet another 32 bit toolchain installed on my computer (I already have Eclipse which I am using with the NPX ARM Cortex M3 chips), I thought this would be an excellent opportunity. | ||
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| There is a bi-color LED on board even though only the green LED is used in the WiFi application. It looks like the PWB can also accommodate a 433MHz receiver and be operated from a battery operated remote controller and the red LED is used in that application. | There is a bi-color LED on board even though only the green LED is used in the WiFi application. It looks like the PWB can also accommodate a 433MHz receiver and be operated from a battery operated remote controller and the red LED is used in that application. | ||
| The schematic is available from Itead, the manufacturer of the device [[https://www.itead.cc/wiki/images/f/f8/Sonoff-Schmatic.pdf|Sonoff Basic Schematic]] | The schematic is available from Itead, the manufacturer of the device [[https://www.itead.cc/wiki/images/f/f8/Sonoff-Schmatic.pdf|Sonoff Basic Schematic]] | ||