Comments on: Wireless Sensors – Overview https://l0l.org.uk.archived.website make it, break it, fix it, hack it, own it Sat, 05 Nov 2016 16:17:33 +0000 hourly 1 https://wordpress.org/?v=4.5.14 By: gareth https://l0l.org.uk.archived.website/wireless-sensors-overview/#comment-37 Fri, 27 Jun 2014 15:15:02 +0000 https://l0l.org.uk.archived.website/?page_id=453#comment-37 Hello TankSlappa – I recognise your name as one of the regular posters over a jeelabs forums.

Even though I’ve got a jeenode USB I’d completely missed the fact that they have built in chargers! Sweet! Thanks for letting me know that.

Although for my use cases, the battery is charged every year or two, so it probably is more economical to use cheaper jeenodes.

Also that way an FTDI chip is not wasted in each node either.

I am indeed a fan of JCW’s work partly because of his obsession with low power! I hope you can read the (old version DaveCAD format) schematic in the page above where I use his FET trick to mimize the leakage current of the battery voltage monitor?

]]> By: TankSlappa https://l0l.org.uk.archived.website/wireless-sensors-overview/#comment-34 Fri, 20 Jun 2014 22:27:47 +0000 https://l0l.org.uk.archived.website/?page_id=453#comment-34 You might want to look at the JeeNode USB design… http://www.digitalsmarties.net/products/jeenode-usb

It’s a Jeenode, based on the SMD ATmega328, with built in LiPo charger which, importantly, works inline! The charging chip might actually be the same as the Adafruit one, the 5 pin package looks familiar.

Also it’s really worth having a look at JC’s weblog posts about power conservation and battery life, he has an obsession with low power consumption 😉

http://jeelabs.org/2011/05/21/still-running-on-lipo/
http://jeelabs.org/2009/12/19/battery-life-refinement/

He’s got some nice tricks such as completely powering off the radio via a FET and putting the ATmega into a deep sleep.

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