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author | dakkar <dakkar@thenautilus.net> | 2018-03-25 15:07:16 +0100 |
---|---|---|
committer | dakkar <dakkar@thenautilus.net> | 2018-03-25 15:10:07 +0100 |
commit | acfa9683248bc7cd25dda20d53307879fabb8f33 (patch) | |
tree | fc7800224d77d98e2e8bdd64cac3966ac809dc4f | |
parent | anime bump (diff) | |
download | thenautilus-acfa9683248bc7cd25dda20d53307879fabb8f33.tar.gz thenautilus-acfa9683248bc7cd25dda20d53307879fabb8f33.tar.bz2 thenautilus-acfa9683248bc7cd25dda20d53307879fabb8f33.zip |
rough writeup of the thermostat project
19 files changed, 554 insertions, 0 deletions
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b/additions/HW/thermostat/rf-pair.jpg diff --git a/additions/HW/thermostat/rf-receiver-diagram.png b/additions/HW/thermostat/rf-receiver-diagram.png Binary files differnew file mode 100644 index 0000000..c624076 --- /dev/null +++ b/additions/HW/thermostat/rf-receiver-diagram.png diff --git a/additions/HW/thermostat/rf-receiver-diagram.svg b/additions/HW/thermostat/rf-receiver-diagram.svg new file mode 100644 index 0000000..2df4b25 --- /dev/null +++ b/additions/HW/thermostat/rf-receiver-diagram.svg @@ -0,0 +1,227 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!-- Created with Inkscape (http://www.inkscape.org/) --> + +<svg + xmlns:dc="http://purl.org/dc/elements/1.1/" + xmlns:cc="http://creativecommons.org/ns#" + xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" + xmlns:svg="http://www.w3.org/2000/svg" + xmlns="http://www.w3.org/2000/svg" + xmlns:xlink="http://www.w3.org/1999/xlink" + xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" + 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inkscape:export-xdpi="150" + inkscape:export-ydpi="150" /> + <path + style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:3.02362204;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" + d="m 340.15748,461.10237 0,37.79527 h 321.25985 l 5.07752,-338.74909" + id="path1749" + inkscape:connector-curvature="0" + transform="scale(0.26458333)" + sodipodi:nodetypes="cccc" + inkscape:export-xdpi="150" + inkscape:export-ydpi="150" /> + <text + xml:space="preserve" + style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:16px;line-height:125%;font-family:Sans;-inkscape-font-specification:Sans;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" + x="472.44095" + y="309.92126" + id="text832" + 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a/additions/HW/thermostat/thermometer.jpg b/additions/HW/thermostat/thermometer.jpg Binary files differnew file mode 100644 index 0000000..cbe30b5 --- /dev/null +++ b/additions/HW/thermostat/thermometer.jpg diff --git a/additions/HW/thermostat/transmitter-build.jpg b/additions/HW/thermostat/transmitter-build.jpg Binary files differnew file mode 100644 index 0000000..c998f32 --- /dev/null +++ b/additions/HW/thermostat/transmitter-build.jpg diff --git a/src/HW/thermostat/.gitignore b/src/HW/thermostat/.gitignore new file mode 100644 index 0000000..08d33d4 --- /dev/null +++ b/src/HW/thermostat/.gitignore @@ -0,0 +1,2 @@ +/document.en.du.xml +/document.it.du.xml diff --git a/src/HW/thermostat/document.en.rest.txt b/src/HW/thermostat/document.en.rest.txt new file mode 100644 index 0000000..d3c282d --- /dev/null +++ b/src/HW/thermostat/document.en.rest.txt @@ -0,0 +1,105 @@ +=========================== +Building a smart thermostat +=========================== +:CreationDate: 2018-03-25 12:47:54 +:Id: HW/thermostat +:tags: - hardware + - software + +I'd like to have a computer-controller thermostat, that behaves the +way I want to, doesn't need to talk to external servers, can measure +temperature in multiple rooms. + +I'll need: + +* multiple cheap temperature sensors that can report their readings + wirelessly +* a way to start / stop the boiler +* some clever software to decide when to turn the boiler on/off based + on the temperature readings +* a computer to run that software + +The sensors +=========== + +The current candidate is a ESP32_ running off (probably alkaline) +batteries, using a DHT11_ sensor. + +.. figure:: thermometer-diagram.png + :align: center + + Connections: + + =============== ====== + microcontroller sensor + =============== ====== + +5V VCC + GND GND + pin 13 DATA + =============== ====== + +`The code for the thermometer`_ uses the DHTesp_ library to read the +sensor, and the `esp8266-oled-ssd1306`_ library to drive the +display. The final sensor will most probably not have a display. + +.. _ESP32: https://en.wikipedia.org/wiki/ESP32 +.. _DHT11: https://www.adafruit.com/product/386 +.. _`The code for the thermometer: + https://www.thenautilus.net/cgit/thermostat/tree/sensor/thermostat.ino +.. _DHTesp: https://github.com/beegee-tokyo/DHTesp +.. _`esp8266-oled-ssd1306`: + https://github.com/ThingPulse/esp8266-oled-ssd1306/ + +Talking to the boiler +===================== + +Using the process described by `Steven Hale`_, `Dave Hope`_, `Ross +Harper`_ and probably others, I connected a 433MHz receiver to my +soundcard: + +.. figure:: rf-receiver-diagram.png + :align: center + + Connections: + + ============= ======= + From To + ============= ======= + Power + receiver VCC + Power - receiver GND + Power - microphone cable shielding via 22kΩ resistor + receiver data microphone cable channel via 47kΩ resistor + ============= ======= + +By turning the knob the thermostat that was installed with the boiler, +I generated the on and off signals. I recorded them with Audacity_, +and spent a few hours puzzling them out (I'll write more details about +this part at some future time). + +Then I built a transmitter: + +.. figure:: rf-trasmitter-diagram.png + :align: center + + Connections: + + =============== =========== + microcontroller transmitter + =============== =========== + +3.3V VCC + GND GND + pin 7 DATA + =============== =========== + +and wrote `code to send the correct pulse train`_. The receiver wired +to the boiler recognises the signals and turns on and off. + +.. _`Steven Hale`: + http://www.stevenhale.co.uk/main/2013/08/home-automation-reverse-engineering-a-worcester-bosch-dt10rf-wireless-thermostat/ +.. _`Dave Hope`: + https://damn.technology/controlling-british-gas-wr1-receiver-arduino +.. _`Ross Harper`: + http://rossharper.net/2015/11/decoding-a-siemens-rcr10433-thermostat-signal-to-control-a-boiler-from-a-raspberry-pi/ +.. _Audacity: https://www.audacityteam.org/ +.. _`code to send the correct pulse train`: + https://www.thenautilus.net/cgit/thermostat/tree/trasmitter/sender.ino diff --git a/src/HW/thermostat/du2html.xsl b/src/HW/thermostat/du2html.xsl new file mode 120000 index 0000000..e2487e0 --- /dev/null +++ b/src/HW/thermostat/du2html.xsl @@ -0,0 +1 @@ +../../../templates/du2html.xsl
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