erlang_raspberrypi_temperature_sensor
说明： 使用Adafruit IO Dashboard、MCP3008 ADC和DHT11传感器的小覆盆子Pi-IoT项目。
(A small Raspberry Pi IoT-project using Adafruit IO Dashboard, MCP3008 ADC and DHT11-sensor.)
(A small Raspberry Pi IoT-project using Adafruit IO Dashboard, MCP3008 ADC and DHT11-sensor.)
文件列表:
LICENSE (52, 2016-06-15)
Makefile (259, 2016-06-15)
dht11_src/ (0, 2016-06-15)
dht11_src/dht11 (8108, 2016-06-15)
dht11_src/dht11.c (2214, 2016-06-15)
erlang.mk (207224, 2016-06-15)
relx.config (72, 2016-06-15)
rpi3-wiring.png (821044, 2016-06-15)
run.sh (59, 2016-06-15)
src/ (0, 2016-06-15)
src/dht11.erl (672, 2016-06-15)
src/file_read.erl (522, 2016-06-15)
src/iottimer.erl (260, 2016-06-15)
src/lightlevel_handler.erl (944, 2016-06-15)
src/mcp3008.erl (697, 2016-06-15)
src/rest.erl (1058, 2016-06-15)
src/toppage_handler.erl (879, 2016-06-15)
src/webserver.app.src (371, 2016-06-15)
src/webserver_app.erl (1035, 2016-06-15)
src/webserver_sup.erl (1032, 2016-06-15)
templates/ (0, 2016-06-15)
templates/lightlevel.dtl (130, 2016-06-15)
templates/toppage.dtl (120, 2016-06-15)
Makefile (259, 2016-06-15)
dht11_src/ (0, 2016-06-15)
dht11_src/dht11 (8108, 2016-06-15)
dht11_src/dht11.c (2214, 2016-06-15)
erlang.mk (207224, 2016-06-15)
relx.config (72, 2016-06-15)
rpi3-wiring.png (821044, 2016-06-15)
run.sh (59, 2016-06-15)
src/ (0, 2016-06-15)
src/dht11.erl (672, 2016-06-15)
src/file_read.erl (522, 2016-06-15)
src/iottimer.erl (260, 2016-06-15)
src/lightlevel_handler.erl (944, 2016-06-15)
src/mcp3008.erl (697, 2016-06-15)
src/rest.erl (1058, 2016-06-15)
src/toppage_handler.erl (879, 2016-06-15)
src/webserver.app.src (371, 2016-06-15)
src/webserver_app.erl (1035, 2016-06-15)
src/webserver_sup.erl (1032, 2016-06-15)
templates/ (0, 2016-06-15)
templates/lightlevel.dtl (130, 2016-06-15)
templates/toppage.dtl (120, 2016-06-15)
Raspberry Pi Erlang IoT Webserver
=====
Erlang application with an embedded [Cowboy webserver](https://github.com/ninenines/cowboy) for reading values from sensors and publishing to a Adafruit.io IoT-Dashboard. The program uses [Erlang ALE module](https://github.com/esl/erlang_ale) to read an analog sensor through the SPI-interface and a C driver program to read the DHT11-sensor. Being more low level, the C program reads more accurate values and outputs them as JSON. Erlang executes the C program and extracts the values using the [JSX library](https://github.com/talentdeficit/jsx#encode12).
- [Prerequisites - Hardware](#pregh)
- [Prerequisites - Software](#preqs)
- [Wiring the Raspberry and the sensors](#wiring)
- [Building](#building)
- [Starting the server](#starting)
- [Automatic timer to continuously publish sensor values to Adafruit.io](#timer)
- [Testing the sensors from the Erlang Shell](#testing)
- [Accessing the sensors throught the embedded webserver](#webserver)
Prerequisites - Hardware
----
- Raspberry 3B/2B
- Full size breadboard, [Buy from Adafruit](https://www.adafruit.com/products/239)
- Adafruit T-Cobbler Plus GPIO Breakout, [Buy from Adafruit](https://www.adafruit.com/products/2028)
- MCP3008 Analog to Digital Converter, [Buy from Adafruit](https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters/mcp3008)
- Keyes DHT11 Digital temperature and humidity sensor, [Amazon](https://www.amazon.com/Digital-Temperature-Humidity-Sensor-Arduino/dp/B0100A9SZ2/ref=sr_1_cc_3?s=aps&ie=UTF8&qid=1465662964&sr=1-3-catcorr&keywords=keyes+dht11)
- Keyes Photo Resistor (analog light level sensor), [Amazon](https://www.amazon.com/HobbyKing-KY-018-resistor-Module-Arduino/dp/B01EE0WNZQ/ref=sr_1_2?s=toys-and-games&ie=UTF8&qid=1465663093&sr=1-2&keywords=keyes+photo+resistor)
Prerequisites - Software
-----
You must download and install [Erlang](https://www.erlang-solutions.com/home.html) in order to build and run this project.
For Raspberry Pi, you can download Erlang Mini (without gui packages) which is good for small embedded devices. Go to the [download page](https://www.erlang-solutions.com/resources/download.html), select "Raspbian" and follow the installation instructions.
To read values from sensors with Erlang, this project uses the [Erlang ALE module](https://github.com/esl/erlang_ale). I highly recommend you to follow the directions in the modules repository to test it in a local repo before integrating it in your own project.
The software tries to publish values to [Adafruit IoT Dashboard](https://io.adafruit.com), so you will need an account and a dashboard. You can read Jeremy Morgans great blog post [here](https://www.jeremymorgan.com/internet-of-things/how-to-adafruit-io/) on how to do that.
Wiring the Raspberry and the sensors
----
0. Start by connecting the Cobbler to the breadboard and then to the Raspberry PI
1. Wire the Analog-to-Digital Converter (ADC) according to [Adafruit's excellent guide](https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters/mcp3008). On a Raspberry 3, you can wire the ADC directly to the hardware SPI interface (see a separat section in the guide for that).
2. Connect the Photo Resistor to channel 0 on the ADC.
3. Connect the DHT11 to GPIO #4
4. Git clone this repo and then build the code as described below.
Build
-----
$ make distclean
$ make
Starting the server
----
To start the release in the console:
$ chmod u+x run.sh
$ ./run.sh
or
$ ./_rel/webserver/bin/webserver console
Automatic timer to continuously publish sensor values to Adafruit.io
----
By starting a timer, you can let Erlang read and publish sensor values continuously to Adafruit.io.
(webserver@127.0.0.1)1> iottimer:start(5000).
In this example, Erlang will read and publish new values every 5 seconds. To stop the timer, call the stop function:
(webserver@127.0.0.1)2> iottimer:stop().
Testing the sensors from the Erlang Shell
----
After you have startet the server with one of the terminal commands above, you will be able to execute commands directly in the Erlang Shell:
pi@raspberrypi3:~/erlang_raspberrypi_temperature_sensor $ ./run.sh
....
/home/pi/erlang_raspberrypi_temperature_sensor/_rel/webserver
Erlang/OTP 18 [erts-7.3] [source] [smp:4:4] [async-threads:10] [kernel-poll:false]
Eshell V7.3 (abort with ^G)
(webserver@127.0.0.1)1>
Try running "mcp3008:readSPI(0)." to read a value from the light-level sensor connected to channel 0 on the ADC:
(webserver@127.0.0.1)1> mcp3008:readSPI(0).
{
"id": 649281259,
"value": "116",
"position": null,
"lat": null,
"lon": null,
"ele": null,
"feed_id": 592856,
"group_id": null,
"expiration": null,
"completed_at": null,
"created_at": "2016-06-12T11:57:21.688Z",
"updated_at": "2016-06-12T11:57:21.688Z",
"created_epoch": 1465732641.68893
}
Try running "dht11:read()." to read and publish humidity and temperature values:
(webserver@127.0.0.1)2> dht11:read().
{
"id": 649260154,
"value": "32.0",
"position": null,
"lat": null,
"lon": null,
"ele": null,
"feed_id": 592854,
"group_id": null,
"expiration": null,
"completed_at": null,
"created_at": "2016-06-12T11:51:11.719Z",
"updated_at": "2016-06-12T11:51:11.719Z",
"created_epoch": 1465732271.71952
}{
"id": 649260167,
"value": "26.0",
"position": null,
"lat": null,
"lon": null,
"ele": null,
"feed_id": 592855,
"group_id": null,
"expiration": null,
"completed_at": null,
"created_at": "2016-06-12T11:51:11.935Z",
"updated_at": "2016-06-12T11:51:11.935Z",
"created_epoch": 1465732271.93519
}
Accessing the sensors throught the embedded webserver
----
The embedded Cowboy webserver's endpoints are coded in the file webserver_app.erl. Point your browser at http://localhost:8080/sensors/light to see output from the sensor (that is, if your Raspberry actually has a sensor connected).
Prerequisites - Software
-----
You must download and install [Erlang](https://www.erlang-solutions.com/home.html) in order to build and run this project.
For Raspberry Pi, you can download Erlang Mini (without gui packages) which is good for small embedded devices. Go to the [download page](https://www.erlang-solutions.com/resources/download.html), select "Raspbian" and follow the installation instructions.
To read values from sensors with Erlang, this project uses the [Erlang ALE module](https://github.com/esl/erlang_ale). I highly recommend you to follow the directions in the modules repository to test it in a local repo before integrating it in your own project.
The software tries to publish values to [Adafruit IoT Dashboard](https://io.adafruit.com), so you will need an account and a dashboard. You can read Jeremy Morgans great blog post [here](https://www.jeremymorgan.com/internet-of-things/how-to-adafruit-io/) on how to do that.
Wiring the Raspberry and the sensors
----
0. Start by connecting the Cobbler to the breadboard and then to the Raspberry PI
1. Wire the Analog-to-Digital Converter (ADC) according to [Adafruit's excellent guide](https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters/mcp3008). On a Raspberry 3, you can wire the ADC directly to the hardware SPI interface (see a separat section in the guide for that).
2. Connect the Photo Resistor to channel 0 on the ADC.
3. Connect the DHT11 to GPIO #4
4. Git clone this repo and then build the code as described below.
Build
-----
$ make distclean
$ make
Starting the server
----
To start the release in the console:
$ chmod u+x run.sh
$ ./run.sh
or
$ ./_rel/webserver/bin/webserver console
Automatic timer to continuously publish sensor values to Adafruit.io
----
By starting a timer, you can let Erlang read and publish sensor values continuously to Adafruit.io.
(webserver@127.0.0.1)1> iottimer:start(5000).
In this example, Erlang will read and publish new values every 5 seconds. To stop the timer, call the stop function:
(webserver@127.0.0.1)2> iottimer:stop().
Testing the sensors from the Erlang Shell
----
After you have startet the server with one of the terminal commands above, you will be able to execute commands directly in the Erlang Shell:
pi@raspberrypi3:~/erlang_raspberrypi_temperature_sensor $ ./run.sh
....
/home/pi/erlang_raspberrypi_temperature_sensor/_rel/webserver
Erlang/OTP 18 [erts-7.3] [source] [smp:4:4] [async-threads:10] [kernel-poll:false]
Eshell V7.3 (abort with ^G)
(webserver@127.0.0.1)1>
Try running "mcp3008:readSPI(0)." to read a value from the light-level sensor connected to channel 0 on the ADC:
(webserver@127.0.0.1)1> mcp3008:readSPI(0).
{
"id": 649281259,
"value": "116",
"position": null,
"lat": null,
"lon": null,
"ele": null,
"feed_id": 592856,
"group_id": null,
"expiration": null,
"completed_at": null,
"created_at": "2016-06-12T11:57:21.688Z",
"updated_at": "2016-06-12T11:57:21.688Z",
"created_epoch": 1465732641.68893
}
Try running "dht11:read()." to read and publish humidity and temperature values:
(webserver@127.0.0.1)2> dht11:read().
{
"id": 649260154,
"value": "32.0",
"position": null,
"lat": null,
"lon": null,
"ele": null,
"feed_id": 592854,
"group_id": null,
"expiration": null,
"completed_at": null,
"created_at": "2016-06-12T11:51:11.719Z",
"updated_at": "2016-06-12T11:51:11.719Z",
"created_epoch": 1465732271.71952
}{
"id": 649260167,
"value": "26.0",
"position": null,
"lat": null,
"lon": null,
"ele": null,
"feed_id": 592855,
"group_id": null,
"expiration": null,
"completed_at": null,
"created_at": "2016-06-12T11:51:11.935Z",
"updated_at": "2016-06-12T11:51:11.935Z",
"created_epoch": 1465732271.93519
}
Accessing the sensors throught the embedded webserver
----
The embedded Cowboy webserver's endpoints are coded in the file webserver_app.erl. Point your browser at http://localhost:8080/sensors/light to see output from the sensor (that is, if your Raspberry actually has a sensor connected).
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