[Rob Conway] > Has anybody got a simple battery backup on their network to keep the sensors > alive ?
Not really simple, but I can describe it anyway. It may be a bit off topic. My requirements are probably a bit different. I also need to keep the datalogger alive, and heaters (to melt snow and to keep stuff moisture free). I need both 5V and 12V and the ability to get lots of amps. The cheap solution for this is a regular PSU. It can be scavenged from a discarded PC. For backup power I then simply use a cheap 1300VA UPS that I had for my datalogger anyway. It should keep everything alive for some hours, depending on how much heating is needed. But PSU's sometimes fail, and after a such incident, I made sure to use two PSU's (each capable of 30A for 5V and 12V, a lot more than I need). I then used car relays to wire them together so that if the primary PSU fails, the second PSU will be powered on and feed my stuff. An AAG 1-wire switch is monitoring this, so I'll get an e-mail if it happens. I even put the PSU's on different UPS's, so if the primary PSU fails, I'll still get power. I've also made several 5V and 12V outlets each with its own fuse, so one short shouldn't bring down everything. It may seem a bit paranoid, but my 1-wire stuff grew big and complicated over the years and things usually failed at an inconvenient time, so I began to set up backup solutions for most things, then fixes can wait a little. -- Steinar ------------------------------------------------------------------------------ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
