Tag Archives: stg15

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ESPurna smart socket

After a busy month I decided to spend some energy on doing hardware instead of software and the result was the ESPurna board I posted about just yesterday. The goal was to have a device based on the ESP8266 I could fit into my house wall gangs, with an SPDT relay to work with multi-way switches and power monitoring using the same IC the Sonoff POW uses: the HLW8012.

As a side project today I’ve been searching on the box of the TODO projects and I have rescued a KEMO STG15 [Ebay] plug housing with socket. These sockets are somewhat expensive and really bulky but the good thing is that there is quite some room to fit some electronics inside, but not a Sonoff board, too big.

But, what about an ESPurna board?

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S20 Smart Switch

S20 Smart Socket

Since I discovered the Sonoff I’ve been thinking about embedding it inside a switch. I started looking for old power meters, timers,… I had at home but the Sonoff is a bit too long. Why didn’t they design a square board? I event bought a bulky Kemo STG15 case with socket.

Next I decided to design my own board. It is meant to be the “official” hardware for the ESPurna project so it’s called ESPurna too. It’s opensource hardware and available at the ESPurna project repository at Bitbucket. I have some boards already for the first iteration (version 0.1). They are mostly OK but I’m already working on a revision.

But then ITead’s released their S20 Smart Socket. It’s the Sonoff in a wall socket enclosure. Almost 100% what I wanted. And at 11.70€ it’s hard to beat. There are other wifi smart sockets available, mainly Orvibo and BroadLink (an SP2 Centros should be arriving home anyday now) but ITead’s is cheaper and you can easily re-flash it. Just solder a 4 pins header, connect it to your FTDI programmer, hold the S20 button, connect the programmer to your computer and flash. Done.

OK, not so fast. Why would I do that? Why would I change the stock firmware?

The answer for me is a mixed up of philosophy and practicity. But you are right. Let’s go step by step.

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