Power meter
Describe power_meter here.
Contents
2014
I have chosen to go with the openenergymonitor.org products (because they do 'real' usage by using voltage calibration and its all built on ardunio and raspberry pi) http://openenergymonitor.org/emon/
I've chosen (for now) to use a standalone emoncms installation and to run it on a raspberry pi (eventually I'll migrate it to the Synology NAS).
How to partition the raspberry pi hdd http://superuser.com/questions/662614/raspberry-pi-how-to-format-hdd
- ssh into raspberrypi as pi
Update to the latest version of emoncms cd /var/www/emoncms/ git pull /var/www/emoncms git pull /var/www/emoncms/Modules/packetgen expand the disk get gparted sudo apt-get install gparted export display export DISPLAY=x.y.z.a:0 start mobaxterm on windows machine sudo gparted - browse to sda create ext4 partition in remaining space make a mount point sudo mkdir /hdddata sudo vi /etc/fstab add entry /dev/sda3 /hdddata ext4 defaults 0 2 sudo mount -a verify the additinal mountpoint is in use df -h pi@raspberrypi / $ df -h Filesystem Size Used Avail Use% Mounted on rootfs 2.6G 2.3G 250M 91% / /dev/root 2.6G 2.3G 250M 91% / devtmpfs 235M 0 235M 0% /dev tmpfs 49M 260K 49M 1% /run tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 98M 0 98M 0% /run/shm /dev/mmcblk0p1 59M 19M 41M 32% /boot /dev/sda3 915G 72M 868G 1% /hdddata sudo vi /etc/fstab
Problem with recieving data from the monitors
Emon Pi losing connection to EmonTX and EmonTH Sometimes the Pi simply doesnts talk to the SPI device.
run
sudo reset_rfm2pi sudo /etc/init.d/emonhub restart
resetrfm2pi rfm2pi.txt openenergymonitor.org/emon/sites/default/files/resetrfm2pi.txt
#!/usr/bin/env python """ """ __author__ = 'Paul Burnell (pb66)' __date__ = '14-05-2015' # http://openenergymonitor.org/emon/node/5549 import RPi.GPIO as GPIO import time pin = 7 # P1-7 (BCM pin 4 or WiringPi pin 7) try: GPIO.setmode(GPIO.BOARD) GPIO.setup(pin, GPIO.OUT) GPIO.output(pin, GPIO.HIGH) time.sleep(0.12) GPIO.output(pin, GPIO.LOW) GPIO.cleanup() except Exception as e: print(e)
Tools to format a USB HDD as fat32
install dosfstools
apt-get install dosfstools
then use gparted (if you dont install dosfstools you cant format a disk using fat32)
Older
Stand alone unit - serial out apparently Current Cost - £49.64
www.amazon.co.uk/dp/B004NCS0BW/?tag=fsa001-21
www.filesaveas.com/powermeters.html
NZ Sales agent $183.50
www.smartnow.co.nz/store/product.php?id_product=10
Fluksometer www.rowetel.com/blog/?page_id=312
2 way power switch 240v AC
G ----------------------------------> 1 ---------- 1 L-->C C--BLUE----(x) ----+ ^ 2 -----------2 ^ ^ N ----------------------------------^ Blue from second switch tailed back to first then off to the light