I am trying to power the SparkCore with a LiPo battery and I am trying to use a single USB port that would allow for charging the LiPo as well as connect to the SparkCore. As an example, Adafruit has a LiPo charger backpack for it’s Trinket ( https://www.adafruit.com/products/2124 ) that connects to a…

You can have access to the USB 5V through a rated 3A diode via Vin pin. That will not be true 5V thought due to voltage drop across the diode. Look at the battery shield sold by Spark. That sounds like what you might require :slight_smile:

Battery shield by spark sounds good, but I think you might also be able to make that Adafruit LiPo Backpack work. If you hook it up like this: LIPO BACKPACK ..... SPARK CORE 5V ..... solder to anode of large diode next to USB conn GND ..... GND BAT -|>|- VIN That’s …

Honestly, I didn’t even see that they had their own backpack for the SparkCore. After seeing it though… It’s rather bulky, to say the least. I need this project to entirely fit within a 1.5" diameter cylinder, so the size of the existing shield would definitely exceed that. Kennethlimcp and BDub, I …

[image] hariganti: Are Eagle or drawing schematics available? I'm not sure if you are talking about the adafruit lipo charger backpack or the spark core. I did not find any schematic / layout for the lipo stuff, but the spark core stuff is here: GitHub - particle-iot/core: Hardware design fi…

[image] BDub: [...] the spark core stuff is here: GitHub - particle-iot/core: Hardware design files for the Spark Core, a tiny Wi-Fi development kit. Thank you! That's exactly what I was looking for. Sorry I was unclear about which component I meant. [image] BDub: Everything will be fine…

Here’s a picture / schematic of the proposal for the Lipo charger: [image] [image] Hopefully that is clearer :smile: As for the inductive charging / stainless steel questions… I think I need some pictures from you :smile:

Awesome, I think I understand the circuit. As for dealing with all the wireless issues: I think I what I will do for the inductive charging problem is simply have a cutout in the stainless where the charger is. I will try testing the effect of a stainless sheet separating the coils, and if it work…

This is awesome! Sorry to revive an old post, but I was wondering if there was a way to do this without soldering to the diode on the Spark? Something that can switch between charging/discharging the battery using just the Vin pin? I’m a hardware newbie :persevere: Thanks!

SparkCore with LiPo Charger

Hardware

BDub November 9, 2014, 11:47pm 7

Here’s a picture / schematic of the proposal for the Lipo charger:

Hopefully that is clearer

As for the inductive charging / stainless steel questions… I think I need some pictures from you

Core with LiPo Charger connection issue

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SparkCore with LiPo Charger

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