Differences

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--- spark_counter [2015/10/25 18:52] – [Raspberry Pi] kingkevin
+++ spark_counter [2015/12/08 16:27] – [Orange Pi] kingkevin
@@ Line 15: / Line 15: @@
 ====== 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 85: / 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 109: / 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 123: / 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]].
 [[http://elinux.org/RPi_Low-level_peripherals#P1_Header|RPi]] - nRF24L01+ connection:
@@ Line 137: / Line 137: @@
 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 ======
+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.
+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.
+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]].