Differences

This shows you the differences between two versions of the page.

--- spark_counter [2015/10/25 17:24] – moved from power monitor kingkevin
+++ spark_counter [2015/12/08 16:22] – [Raspberry Pi] kingkevin
@@ Line 1: / Line 1: @@
-The spark counter is a custom electricity meter.
+The spark counter is a custom electricity meter with wireless data logging capability.
 On one side I have:
@@ Line 8: / Line 8: @@
 On the other side:
   * a [[#nRF24L01+|nRF24L01+ radio]] to receive the values
-  * a [[#Raspberry Pi|Raspberry Pi single board computer]] to store the measurements
+  * a [[#Raspberry Pi|Raspberry Pi single board computer]] to store the measurements in an [[https://influxdb.com/|influxDB time series database]]
-  * a gradana graphical monitoring tool to display the electricity consumption
+  * a [[http://grafana.org/|grafana graphical monitoring tool]] to display the electricity consumption
+{{:spark_counter:dsc02371.jpg?0x300|complete spark counter}}
 ====== peacefair PZEM-004 ======
-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:
   * measures voltages 80-260 V AC
@@ Line 22: / Line 24: @@
   * is powered using 80-260 V AC
   * provides a TTL UART port to query these values (or set an alarm so to beep when a provided power threshold is reached)
+{{:spark_counter:dsc02361.jpg?0x200|PZEM-004 front}}
+{{:spark_counter:dsc02359.jpg?0x200|PZEM-004 back}}
 The voltage measurement is done over the power input port.
@@ Line 27: / Line 32: @@
 Pass the wire on which you would like to measure the current through the coil, and connect the coil to the power meter.
 A drawing on the back of the device will describe how to connect the wires.
+{{:spark_counter:dsc02328.jpg?0x200|PZEM-004 opto-couplers}}
 The meter also provides a UART port to query the measured values.
 Two opto-couplers isolate the main power meter circuits from the TX and RX UART ports.
-The {{:power_meter:pzem-004.rtf|manual}} provides the corresponding commands, but lacks some information.
+The {{:spark_counter:pzem-004.rtf|manual}} provides the corresponding commands, but lacks some information.
 The UART configurations is 9600 bps 8N1.
 Before querying the measurements, you have to set an address to the device.
@@ Line 60: / Line 67: @@
 I removed the pizeo-element to prevent this annoying sound.
-The power meter uses a single chip solution, the [[http://www.sdicmicro.com/products.html?ic=SD3004|SDIC microelectronics SD3004]] ({{:power_meter:sd3004_datasheet_v0.2c.pdf|datasheet}}).
+{{:spark_counter:dsc02344.jpg?0x200|PZEM-004 board front}}
+{{:spark_counter:dsc02325.jpg?0x200|PZEM-004 board back}}
+{{:spark_counter:dsc02327.jpg?0x200|PZEM-004 board IC}}
+The power meter uses a single chip solution, the [[http://www.sdicmicro.com/products.html?ic=SD3004|SDIC microelectronics SD3004]] ({{:spark_counter:sd3004_datasheet_v0.2c.pdf|datasheet}}).
 This chip does all the necessary work: measure voltage and current, drive the 7-segments LED displays, communicate over UART.
 There is only an additional external I²C EEPROM to store the global energy consumption.
@@ Line 66: / Line 77: @@
 ====== ATmega328P ======
-{{ :power_meter:ic_dev_arduino_nano-30.svg?400|Arduino Nano pinout}}
+{{:spark_counter:dsc02354.jpg?0x200|development board}}
+{{:spark_counter:dsc02365.jpg?0x200|development setup}}
+{{ :spark_counter:ic_dev_arduino_nano-30.svg?400|Arduino Nano pinout}}
 To read out the measurements from the [[#peacefair PZEM-004|power meter]] and send them over [[#nRF24L01+|radio]] I used an [[http://www.atmel.com/devices/atmega328p.aspx|Atmel ATmega328P]] micro-controller.
@@ Line 72: / Line 85: @@
 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]].
 This way I learn how it works in details.
@@ Line 89: / Line 102: @@
 ====== nRF24L01+ ======
-{{ :power_meter:nrf24l01_pinout.jpg?250|nRF24L01+ pinout}}
+{{:spark_counter:dsc02353.jpg?0x150|nRF24L01+ module}}
+{{ :spark_counter:nrf24l01_pinout.jpg?250|nRF24L01+ pinout}}
 To transmit the measurements from the [[#ATmega328P]] to the [[#Raspberry Pi|RPi]] I used [[https://www.nordicsemi.com/eng/Products/2.4GHz-RF/nRF24L01P|nordic nRF24L01+]] RF transceivers.
@@ Line 95: / Line 109: @@
 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]].
 On the [[#Raspberry Pi|computer]] side I use the [[https://github.com/TMRh20/RF24|RF24 library]].
@@ Line 102: / Line 116: @@
 ====== Raspberry Pi ======
-{{ :power_meter:pi-gpio-header-26-sm.png?200|RPi P1 header}}
+{{:spark_counter:dsc02375.jpg?0x200|RPi setup}}
+{{ :spark_counter:pi-gpio-header-26-sm.png?200|RPi P1 header}}
 To store the measurements I use a [[https://www.raspberrypi.org/products/model-b/|Raspberry Pi Model B1]] ([[http://elinux.org/RPi_HardwareHistory|rev 0002]]).
@@ Line 108: / Line 123: @@
 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 [[#grafana]].
 [[http://elinux.org/RPi_Low-level_peripherals#P1_Header|RPi]] - nRF24L01+ connection:
@@ Line 121: / Line 135: @@
 | GPIO9/MISO | P1_21 | 7 | MISO |
 | GPIO24 | P1_18 | 8 | IRQ |
+The values are then simply stored in an [[https://influxdb.com/|InfluxDB]] time series database for visualisation in [[http://grafana.org/|grafana]].
+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.
+{{:spark_counter:grafana.png?0x200|grafana visualization}}
+====== Orange Pi ======
+There is no armel build of grafana for the Raspberry Pi, and compiling it from source wasn't possible because 256MB of RAM aren't enough.
+Thus I tried to use a Orange Pi since it was also lying around.
+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 @ 1.8GHz, and 1 GB of RAM.
+That should be plenty to compile and run grafana.
+For this price the hardware is unbeatable, but the software support is quite poor (outdated but indicating [[http://www.orangepi.org/Docs/FAQ.html|FAQ]]).
+Only Android supports the video hardware acceleration currently.
+The official [[http://www.orangepi.org/downloadresources/|images]] are old (e.g. Android 4.2.2), but there are 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]]
+Since I'll only use it as server I decided to go with debian jessie minimal.
+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]].