Tag Archives: MQTT

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Itead Studio Sonoff SC Revisited

A few months ago I wrote about the Sonoff SC sensor hub by Itead Studio. It’s a device with a Sharp GP2Y1010AU0F [Aliexpress] dust sensor, a DHT11 humidity and temperature sensor, an LDR as light sensor and a mic. The sensors are driven by an ATMega328P microcontroller but there is also an ESP8266 on board for WiFi communication, a pretty standard set up when you have several sensors and the ESP8266 GPIOs are just not enough.

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On the first post I already did a small mod to replace the DHT11 humidity and temperature sensor with a more accurate and pin compatible DHT22. Since then, several readers have contributed with code and ideas. My progress implementing and testing them is slow, so I though about writing a first post about some modifications I (and others) have done to the device.

So this is a work in progress post. At the moment, all the code for these modifications is in the dev branch of the repository.

This custom Sonoff SC firmware is released as free open software and can be checked out at my SonoffSC repository on Github.

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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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Magic Home LED Controller ESPurna’d

Following the bright path (sic) of the Ai-Thinker AiLight / Noduino OpenLight I wrote about a few weeks ago, now it’s turn for one of those devices you purchase but once they arrive they are stored in the TODO box until they eventually come back to life.

The Magic Home LED Controller [Aliexpress, also available from Ebay] is an ESP8266 based single-color RGB(W) LED strip controller. It works with every 5050 LED strip [Aliexpress] out there. Just be careful since even thou some LED strips are waterproof [Aliexpress] this controller is not.

Being able to flash a custom firmware in the controller lets you really own the device. Why? Because:

  1. You are not required to install a proprietary app on you phone to manage it
  2. You are not limited by the options the developers of that app have decided you will need
  3. You can make it interoperate with other devices at home
  4. You, and only you, know when you turn on your lights
  5. And if all the previous points are not enough: it’s so much fun!

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AiLight – A hackable RGBW light bulb

Some weeks ago a tweet by Manolis Nikiforakis (@niki511) with the #ESP8266 hashtag drew my attention. Manolis had just received a “smart lamp” branded by Ai-Thinker, the AiLight. Yes, the same Ai-Thinker that has sold millions of ESP8266 based modules. Chances were it had an ESP8266 microcontroller inside. Too good not to buy one and take a look at the inside.

Manolis shared the link where he bought his at Ebay for a bit more than USD 10 plus shipping. Unfortunately it’s out of stock there and there are amazingly few other places where you can buy it. I only found the same product with prices around USD 15-18 at Ebay as ESP8266 Smart Home Wifi RGB LED Light [Ebay] or Noduino Open Light LED Smart Bulb [Ebay] also in a cheaper pack of two light bulbs [Ebay]. You can also find it at Aliexpress sold as “DIY Wifi LED Bulb E27 5W AC110-240V lampada LED Dimmable Bulb Lamp Remote Control Led Spot Light for iPhone Android Phones” [Aliexpress]. Don’t you love those seo-ugly names?

I actually bought two because you never know. And they arrived last Thursday. It took me less that 1 minute to open one of the boxes, pop out the cap and take a look at the inside just to see what I already knew. Time to play 🙂

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Sonoff SC with MQTT and Domoticz support

Last December Itead Studio updated their Home Automation product line with a new and different product. The main difference is that it doesn’t have a relay and it’s mainly sensors and no actuator (if we don’t define a notifying LED as an actuator). The Sonoff SC is a sensor station that packs a DHT11 temperature and humidity sensor, a GM55 LDR, an electret microphone with an amplifier circuit and a Sharp GP2Y1010AU0F [Aliexpress] dust sensor in a fancy case that looks like it was originally meant for a speaker.

The device is packs an ESP8266 as expected and is compatible with the eWeLink app. But, such a collection of sensors, with 3 of them having analog interfaces, cannot be run from the single-ADC ESP8266 so Itead has thrown in a good old ATMega328P to drive the sensors and report the Espressif with the data.

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