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+---
+id: 1076
+title: WIFI+MQTT Smoke-Detector with 5yrs battery and ESP8266
+date: 2018-08-27T02:15:19+00:00
+author: xro
+layout: post
+guid: http://wp.realraum.at/?p=1076
+permalink: /2018/08/wifimqtt-smoke-detector-with-5yrs-battery-and-esp8266/
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+categories:
+ - english
+ - MakingCrafting
+ - Projekte
+ - realraum News
+---
+Read about Flocx’s current project, a battery-saving WIFI+MQTT-enabling cheap smoke-detector here:
+
+
+
+I wanted to do the same thing for my flat, but instead of using the IKEA one, I ordered two cheap 7⬠SmartWares detectors from Amazon with 9V batteries that are advertised to give 5yrs battery life and otherwise identical hardware. Also instead of µPython I used Sming and C++. Just for the fun of it, I also added a voltage divider that measures the battery voltage at the time of alarm.
+
+You can find my [firmware on GitHub](https://github.com/btittelbach/sming_smokedetector).
+
+[Read about Flocx’s current project, a battery-saving WIFI+MQTT-enabling cheap smoke-detector here:
+
+
+
+I wanted to do the same thing for my flat, but instead of using the IKEA one, I ordered two cheap 7⬠SmartWares detectors from Amazon with 9V batteries that are advertised to give 5yrs battery life and otherwise identical hardware. Also instead of µPython I used Sming and C++. Just for the fun of it, I also added a voltage divider that measures the battery voltage at the time of alarm.
+
+You can find my [firmware on GitHub](https://github.com/btittelbach/sming_smokedetector).
+
+](https://github.com/btittelbach/sming_smokedetector/blob/master/esp8266_smokedetector/esp8266_smokedetector.pdf)
+
+Todo for the future: motivate someone to do this for realraum. ;->
+
+Since all 9V smoke-detectors ICs basically use the same pinout with an I/O-function on pin 7 that pulls LOW when no smoke is detected and HIGH on alarm, they are all equally easy to mod. The SmartWares are smaller than the IKEA ones though, so I did not even attempt to fit everything inside the case. More accessibility traded for lower WAF :)
+
+Note that there are 3V Lithium 10yrs battery life smoke detectors out there, which work a bit differently. For once, the ESP8266 does not run with 3.0V but needs true 3.3V, so at the very least you will need a cheap and tiny boost converter from AliExpress. Furthermore, they do not use a CS2105G0 based chip but a PIC which might not have an pin as CS2105G0-I/O-pin configured.
+
+A word of warning: In order to conserve the battery, the circuit disconnects the whole GND when no smoke is detected. Thus GND and 3V3 of the ESP8266 may be short-circuited through the unpowered buck-converter, depending on your component. So just to be safe, remove the Wemos from the circuit before connecting it via USB.
+
+
+
+
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