There are a lot of companies that produce small environmental monitoring devices that can take a digital input. These devices sit on your network and can be SNMP queried by MRTG, Nagios and other management systems.
For example, this one: http://www.networktechinc.com/environment-monitor-micro.html We use their higher-end devices to monitor temperature, humidity, door sensors, and other things. Your problem would be that in reality you want to *count* the pulses, and have MRTG query a total pulse count (this is far better than a rate as you will get more accurate data). Some of the devices may be able to give you pulse counts; others may just let you know the current state. You may be sufficiently knowledgeable to make a sinle pulse counter and SNMP agent using an Arduino or Raspberry Pi, which would be a cheap solution. This company makes SNMP-aware devices that can provide pulse counts: http://www.hw-group.com/products/damocles/damocles_1208_en.html I have not actually used one of these, but it appears to provide the required features, though it may be a bit big for your requirements. Personally, I'd build a device to do it using a RasPi which would cost about $50 all in, plus a few hours coding up a daemon to count pulses and output this via the SNMP daemon. HTH Steve Steve Shipway <mailto:[email protected]> [email protected] (GNU Terry Pratchett) From: mrtg [mailto:[email protected]] On Behalf Of Nick price Sent: Tuesday, 19 May 2015 8:14 a.m. To: [email protected] Subject: [mrtg] power montor The meter from our electric utility supplier gives out 3.5 volt pulses on 2 wires 1000 pulses=0.16kWHr. I need to get these pulses into MRTG. Does anyone know where I can get a box that will output the pulses in a form that MRTG can read them preferably over Ethernet. I would also like it to interface to Nagios if possible. Nick Price
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