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spark_counter [2015/10/25 18:50] – add pitcures kingkevin | spark_counter [2015/12/08 16:27] – [Orange Pi] kingkevin |
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The spark counter is a custom electricity meter. | The spark counter is a custom electricity meter with wireless data logging capability. |
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On one side I have: | On one side I have: |
====== peacefair PZEM-004 ====== | ====== peacefair PZEM-004 ====== |
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The [[http://www.aliexpress.com/wholesale?catId=0&SearchText=peacefair|peacefair]] [[http://www.aliexpress.com/wholesale?catId=0&SearchText=peacefair+pzem-004|PZEM-004]] is a simple power meter. | The [[http://www.aliexpress.com/wholesale?catId=0&SearchText=peacefair|peacefair]] [[http://www.aliexpress.com/wholesale?catId=0&SearchText=peacefair+pzem-004|PZEM-004]] is a simple power meter ({{:spark_counter:peacefair_pzem-004_porduct.pdf|datasheet}}). |
It: | It: |
* measures voltages 80-260 V AC | * measures voltages 80-260 V AC |
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USART to query the power meter, SPI to communicate with the nRF24L01+, and the nRF24L01+ protocol are implemented in C (using a lot of interrupts). | USART to query the power meter, SPI to communicate with the nRF24L01+, and the nRF24L01+ protocol are implemented in C (using a lot of interrupts). |
The source code is available [[https://to.do|in this git]]. | The source code is available [[https://git.cuvoodoo.info/kingkevin/spark_counter/tree/master|in this git]]. |
I prefer directly writing in the registers as described in the [[http://www.atmel.com/images/Atmel-8271-8-bit-AVR-Microcontroller-ATmega48A-48PA-88A-88PA-168A-168PA-328-328P_datasheet_Complete.pdf|datasheet]] rather than using an [[https://www.arduino.cc/en/Main/Software|abstract IDE]] and [[https://github.com/TMRh20/RF24|libraries]]. | I prefer directly writing in the registers as described in the [[http://www.atmel.com/images/Atmel-8271-8-bit-AVR-Microcontroller-ATmega48A-48PA-88A-88PA-168A-168PA-328-328P_datasheet_Complete.pdf|datasheet]] rather than using an [[https://www.arduino.cc/en/Main/Software|abstract IDE]] and [[https://github.com/TMRh20/RF24|libraries]]. |
This way I learn how it works in details. | This way I learn how it works in details. |
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On the [[#ATmega328P|micro-controller]] side I implemented the complete SPI-based protocol using the [[https://www.nordicsemi.com/eng/content/download/2726/34069/file/nRF24L01P_Product_Specification_1_0.pdf|datasheet]]. | On the [[#ATmega328P|micro-controller]] side I implemented the complete SPI-based protocol using the [[https://www.nordicsemi.com/eng/content/download/2726/34069/file/nRF24L01P_Product_Specification_1_0.pdf|datasheet]]. |
The source code is available [[https://to.do|in this git]]. | The source code is available [[https://git.cuvoodoo.info/kingkevin/spark_counter/tree/master|in this git]]. |
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On the [[#Raspberry Pi|computer]] side I use the [[https://github.com/TMRh20/RF24|RF24 library]]. | On the [[#Raspberry Pi|computer]] side I use the [[https://github.com/TMRh20/RF24|RF24 library]]. |
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To receive the measurements I used a [[#nRF24L01+|nRF24L01+ transceiver]] with the [[https://github.com/TMRh20/RF24|RF24 library]]. | To receive the measurements I used a [[#nRF24L01+|nRF24L01+ transceiver]] with the [[https://github.com/TMRh20/RF24|RF24 library]]. |
The source code is available [[https://to.do|in this git]]. | The source code is available [[https://git.cuvoodoo.info/kingkevin/spark_counter/tree/master|in this git]]. |
The values are then simply stored in an [[https://influxdb.com/|InfluxDB]] time series database for visualisation in [[http://grafana.org/|grafana]]. | |
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[[http://elinux.org/RPi_Low-level_peripherals#P1_Header|RPi]] - nRF24L01+ connection: | [[http://elinux.org/RPi_Low-level_peripherals#P1_Header|RPi]] - nRF24L01+ connection: |
| GPIO9/MISO | P1_21 | 7 | MISO | | | GPIO9/MISO | P1_21 | 7 | MISO | |
| GPIO24 | P1_18 | 8 | IRQ | | | GPIO24 | P1_18 | 8 | IRQ | |
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| The values are then simply stored in an [[https://influxdb.com/|InfluxDB]] time series database for visualisation in [[http://grafana.org/|grafana]]. |
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| Note: there is no ARM build of grafana (armel for RPi 1, armhf for later versions). |
| This is also because there is no ARM release of [[http://phantomjs.org/|PhantomJS]]. |
| I'm running grafana on my local computer (amd64), using the remote database on the RPi. |
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{{:spark_counter:grafana.png?0x200|grafana visualization}} | {{:spark_counter:grafana.png?0x200|grafana visualization}} |
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| ====== Orange Pi ====== |
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| The [[http://www.orangepi.org/orangepipc/|Orange Pi PC]] is a cheap [[http://www.aliexpress.com/item/Orange-Pi-PC-ubuntu-linux-and-android-mini-PC-Beyond-and-Compatible-with-Raspberry-Pi-2/32448079125.html|$15 alternative]] to the Raspberry Pi 2. |
| This single board computer is based on an [[https://linux-sunxi.org/H3|Allwinner H3 (sun8iw7p1)]] SoC with ARM Cortex-A7 @ 1.2GHz (often over-clocked), and 1 GB of RAM. |
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| For this price the hardware is unbeatable, but the software support is really poor. |
| Also only Android supports the video hardware acceleration currently. |
| The official [[http://www.orangepi.org/downloadresources/|images]] are quite old (e.g. Android 4.2.2), but there are a bit newer images made available by the community: |
| * such as [[http://www.orangepi.org/orangepibbsen/forum.php?mod=viewthread&tid=755|Android]], with weird [[http://www.orangepi.org/Docs/SDcardinstallation.html#Install_Android_OS_image|installation process]] |
| * various [[http://www.orangepi.org/orangepibbsen/forum.php?mod=viewthread&tid=342|linux]] distributions |
| Since I'll only use it as server I decided to go with debian jessie minimal. |
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| The pin header is the same as the [[http://www.raspberry-projects.com/pi/pi-hardware/raspberry-pi-2-model-b/rpi2-model-b-io-pins|40-pin Raspberry Pi]]. |