After playing around with some older computers (pentium 166MHz, 233MMX, P2 350MHz,...) i finally build a decent p4 1.7MHz wich was later upgraded to 2,4GHz.

D500 Server (10/2006 - 03/2014):
Power consumption 103watt @ full power, 57watt @ idle
- Compaq D500 pc with INTEL PIV 2,4Ghz processor, 1GB ram
- Stripped windows XP OS on 20GB IDE disk + 60GB IDE data disk


After i rebuild an old laptop to be my webserver making it faster and more energy efficient:

Sempron Server (03/2014 - 10/2014):
Power consumption 32watt @ 900mhz (downclocked)
- Compaq 6715 pc with AMD sempron 3000+ processor, 512MB ram
- Stripped windows XP OS on 80GB SATA disk


And finally i used a raspberry PI as my new linux server making it the most energy efficient machine ever! The first version was more of a testmachine using the OS on the SD card and adding an external usb drive with the website data. The next test was booting from the SD card and loading the OS from the first partition of the hard disk. The 'UPS' was only 4x 1.2V nimh batterys connected to the GPIO pins

Raspberry Server (05/2014 - ...):
Power consumption 6watt @ full power, 5watt @ idle

- Raspberry PI @ 700mhz
- Raspbian "Wheezy" OS on SD card
- boot from SD card 1GB
- 4x 1,2V 4000mAh NIMH UPS


 Upgrade 1: move the OS to the hard disk

Raspberry Server upgrade 1:

- Raspbian "Wheezy" OS on 4GB HDD partition (100GB SATA 2,5"HDD on USB)
- Data on 80GB HDD partition (100GB SATA 2,5"HDD on USB)
- Added extra capacitor on 5V VCC lines USB port to prevent reboot when inserting USB device
- Added 4mm copper wire to prevent SD-card bend
- Connected 5V/2A PS directly on USB port pins


 Upgrade 2: move the complete system from my computer room to the living room next to my internet modem. To enhance the looks of the raspberry, i have build in into a nice housing

Raspberry Server upgrade 2:

- Build in raspberry + UPS + HDD in wall case
- Installed Samba


The next upgrade was replacing these 4 C-cell battery's 'UPS' with a system that could power the raspberry a few hours. For this i used a 12V 24Ah lead acid battery. To prevent discharge of the battery, i used an old 19V 4,5A laptop charger toghether with an LM2596 DC converter to 13.5V floating voltage.

The battery itself powers my ADSL modem (bbox2 12V) and my raspberry PI at 5V (second LM2596 converter at 5V)

Raspberry Server upgrade 3:

Replaced 4 C-cell battery's with home build cheap raspberry UPS
1x LM2596 to bring input voltage (16-35V) to 13,5V lead acid float voltage
1x 12V 7Ah lead acid battery 
1x LM2596 to bring 12V battery voltage down to 5V usb for raspberry


The next upgrade has already been build, but not installed. I have adjusted the output of a dell 19V laptop charger to 13,6V making the first LM2596 DC/DC converter obsolete. pictures will be added in the future...




Some of my other projects:

Raspberry as a portablecomputer

Arduino as an oldtimer dashboard