Voltlog #103 – InTheMail

Today we are taking a look at my electronics related mail, I’ve got a bunch of random stuff and links for all of them are provided below the video.

Voltlog #86 – Limiting Iphone USB Charging To 500mA

It all started a few days ago when I was talking with a friend and he suggested, since we do most of our phone charging at night, why not charge them at a lower rate for increase battery life. As you may know, when you increase the charging current, charging happens faster at the expense of losing battery life over time, you get fewer battery cycles before it starts losing its capacity.

So I decided to build this small gadget, that goes between the usb output of my charger and the usb plug from my charging cable. In my case I have an Iphone and the charging current can be limited to 500mA by having a set of resistors on the USB data lines.

Links for the parts used to build the project:

Voltlog #33 – Ublox 7 GPS USB to UART Conversion Hack

In this video I am hacking this vk-172 cheap usb gps module to use UART instead of USB. The module contains the ublox 7 chipset which is quite nice and it makes it much more useful having an UART interface.

PIO10 > pin 33 controls the hardware pin remapping feature
PIO10 low = UART remapped to PIO15 > pin 36 and PIO16 > pin 37
PIO10 high = UART on standard TX on PIO6 > pin 19 and RX on PIO7 > pin 18