|Commercial Protected battery holder|
The one thing that I thought I needed is a protected battery holder, since the batteries have no protection circuit built in. Plus some sort of keyed connector - when I got these on eBay, they came with the JST connectors sets - maybe it was a mistake since the listing doesn't mention it in the listing, but a welcome surprise.
|Firecracker Battery holder|
My first take at a battery holder. Kind of looks like a firecracker, doesn't it? Just took the battery and wandered around the local home supply store and tried different things. I love PVC, I found these gizmos that press fit onto the battery. I scavenged some springs from an AA battery holder - drilled a hole in the end and ran the wire through. Voila - dangerous, but serviceable. Made sure that it had all kinds of markings identifying which end is which. This plus a protector board, a JST connector will find its way outside to the weather transmitter.
|The KahnFire Charger setup|
|The protection board in the circuit|
|And the charger|
Added a trimmer to dial in the current for different batteries. It's almost set to a short to get the 800 ma to charge the 18650s
I saw your post (both on your blog and Cosm forum) regarding some tests on routing a nRF24L01 wireless network to Cosm, and having problems with those 2 libraries (rf24 and Ethernet) to work togheter.
Did you get any result?
I would appreciate if you could share your knowledge.
I am trying to make a similar configuration, but I was thinking maybe using an nrf24 shield connected to a RasperryPi acting as a base station for all the arduino motes, and sending data to Cosm.
Well I am having two solutions. Jee Labs has the solution to the problem. He uses the rfm12b module on all his JeeNodes, and there s quite a code base. Could even use ATtiny85 with them. I have two radio modules but haven't gotten around to experimenting with them yet.
My best solution if I want to keep the existing setup, is to use a Raspberry PI. That is a little learning curve because of Linux, but it is by far the cheapest. That is f one could find one in stock anywhere.
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