EnviroDIY | Dave | Activity https://www.envirodiy.org/members/rfdave/activity/ Activity feed for Dave. Wed, 15 Apr 2026 18:17:37 -0400 https://buddypress.org/?v= en-US 30 hourly 2 3c997807dc135d2531e6a462c58e42d3 Dave replied to the topic Solar Power Supply in the forum Infrastructure and Equipment http://envirodiy.org/topic/solar-power-supply/#post-1324 Tue, 22 Dec 2015 05:01:48 -0500 Hi Kevin-

You’ll probably want to keep the batteries either all in series or all in parallel to keep them charged correctly. I haven’t done a lot of work with batteries, but what I’ve seen seems to have them either all in parallel or all in series. There’s a pretty similar circuit here…[Read more]

]]> 90d2cc4668715b325aa1805c0d7e90fb Dave replied to the topic Beyond 2G cellular modems? in the forum Infrastructure and Equipment http://envirodiy.org/topic/beyond-2g-cellular-modems/#post-1241 Fri, 14 Aug 2015 02:06:43 -0400 Neil-

I don’t have any current active projects, I’m pondering an open source lagrangian drifter for stream flow measurements, but nothing build yet. You’ve written up some nice installation instructions to keep in mind.

Regards

Dave

]]> e3a8df32441963c7bb41defdb6848db4 Dave replied to the topic Beyond 2G cellular modems? in the forum Infrastructure and Equipment http://envirodiy.org/topic/beyond-2g-cellular-modems/#post-1238 Wed, 12 Aug 2015 01:54:46 -0400 That’s a great summary of things. Doing both sides of the link is both an advantage and disadvantage for these approaches. There’s also no re-occurring charges for service, although the up-front cost is probably higher.

]]> a57ba65c29df19eeb28fff6c04b54b7d Dave replied to the topic Beyond 2G cellular modems? in the forum Infrastructure and Equipment http://envirodiy.org/topic/beyond-2g-cellular-modems/#post-1236 Tue, 11 Aug 2015 01:54:04 -0400 Stephanie-

This is independent of a cellular carrier, you use unlicensed ISM bands for communications. You can sort of think of this as very long distance Wifi. The sensors communicate with a separate base station that you configure. The Datarates you can get over this are somewhat dependent on the distance between the sensors and the base…[Read more]

]]> 806226acd0ee455eeb946343d233a603 Dave replied to the topic Beyond 2G cellular modems? in the forum Infrastructure and Equipment http://envirodiy.org/topic/beyond-2g-cellular-modems/#post-1233 Sun, 09 Aug 2015 19:11:56 -0400 One technology that’s become recently available is LoRa, which is a ISM (900 MHz) band system that’s optimized for data transmission. More details at https://www.lora-alliance.org/ but PCB’s with LoRa radios on them are available from Tindie.com at reasonable pricing (sub $20 ish). It looks like these would require a base station to complete a…[Read more]

]]> 93e724ad4678a9e376749b498934ef11 Dave became a registered member https://www.envirodiy.org/activity/p/1146/ Sun, 09 Aug 2015 18:58:30 -0400 0