Dribibu - Home

1-wire temperature monitoring

I've started measuring temperatures in and around the house. Just for fun, I might use this in the future for some home automation. I've used most of this page, and of course I changed some things.

I bought a bundle of 10 waterproof DS18B20 sensors with a 3 meter lead on them. I planned a lineair topology, but half way through decided to test the stubbed topology first. It works flawlessly, so I see no reason to change it. The total network contains 8 sensors, two of them on one 10 meter cable, one on a 15 meter cable. I still have enough 100 Ohm resistors lying around if problems might pop up. The total length is well within specs.

Fritz!Box 7490 and Cacti

Two weeks ago I switched to FTTH from Xs4all, and I got an new modem, a Fritz!box 7490. Internet from the FTU is connected to the Lan1 port, TV is connected to Lan4, the other ports are used by the internal network. The Fritz 7490 doesn't do SNMP, so I've been looking for a way to monitor the traffic. And this is what I've done:

Beware: Following the upgrade to Fritz!OS 6.20 this construction proved to be unstable, one of the commands or the telnetd contains a memory-leak, causing the modem to crash and reboot periodically.

Weer sneller

Eindelijk is het zover, de 21e eeuw bereikt deze website ook. Binnenkort wordt de thuis-aansluiting ge-upgrade naar FTTH. Natuurlijk betekent dat wat down-tijd, maar gezien de enorme bezoekersaantallen (ahum) zullen er niet veel teleurgestelde gebruikers zijn. En daarna gaat het allemaal nóg sneller !

Watermeter and Flukso

I've added an extra sensor to my flukso, to monitor my water usage. The watermeter (a Sensus 620) has no digital connections, and has no built-in magnet for a reed-relais. But it has a turning red/metal wheel inside, that is detectable with an optical sensor. Such a sensor is for sale for € 90,-, but that's too much for me, some browsing on the internet gave me this: