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15 Jul 2015


by Robert Gawron @ robertgawron.blogspot.com:

Li-ion cells become more and more popular due to their capacity and reasonable prices. In this entry I will present how to build a simple li-ion battery charger based on MCP73831 chip. It’s a quite useful device for DYI projects,in addition its cost is only around 1,5 euro.

The device uses USB port as a power supply (mini-USB connector). I use the standard gold-pins as an output socket. There’re three of them, but only two are used (looking on the image, counting from top: V+, V-). I will design my li-ion based devices in the same way (same socket, but female), then if I will connect it in the incorrect direction (rotated 180 degrees) they won’t be damaged (V- connected to V-, but V+ connected to n/c pin) – simple way to avoid plugging in an incorrect way.

How to make a USB Li-Ion charger – [Link]

5 Jun 2015


Dilshan Jayakody published a new project, the FlashProg – a USB serial flash memory programmer:

FlashProg is USB base flash memory programmer to work with 3.3V serial flash memory devices. This programmer is specifically design to read, program and configure 25x series, serial flash memory devices which are commonly used to store BIOS in PC mainboards.
Originally we design this project to read and program BIOS of Foxconn G31MXP mainboard. Our version of G31MXP contains Macronix MX25L8005 8M-Bit serial flash memory and we use this programmer to load some of our custom BIOS to this serial memory.

FlashProg – USB serial flash memory programmer – [Link]

7 May 2015


Jayakody published a new project, a 3A Power supply for USB devices:

This is 5V 3A power supply to drive two USB based devices simultaneously. This power supply is design around LM2576-5.0 switching regulator IC and the main reasons to choose this IC is its low parts count, small heat sink requirements and its inbuilt current limit protection feature.
We specially design this power supply to work with development boards / single board computer (SBC) platforms such as Raspberry Pi, Banana Pi, BeagleBone, etc. This power supply can also be used to provide power to USB OTG peripherals over USB Y cables. We test this setup and got successful results with Huawei Ascend P6 mobile phone.

3A Power supply for USB devices – [Link]

4 May 2015


The Pocket Voltage Supply plugs into any 5V USB hub & allows the user to output 5V,3.3V,2.5V,1.8V,&1.5V. Use it for all your projects!

The Pocket Voltage Supply is a USB powered variable voltage supply. It can be powered with any 5V USB hub and can supply up to 1.5A. 5V USB hubs can be found almost anywhere; desktop computers, laptops, cell phone chargers, even portable USB battery banks. Pairing the Pocket Voltage Supply with a portable USB battery bank allows the user to test circuits and prototypes outside of a lab setting and even bring testing to the field!

Pocket Voltage Supply: A USB Powered Variable Voltage Supply – [Link]

23 Apr 2015


Always handy small but versatile power supply for everyday work with low-power electronic projects

Presenting USBminiPower – the pocket power supply powered from a standard USB port on your computer.

The adjustable power supply is an absolutely vital piece of equipment for any electronics engineer or hobbyist. However in the vast majority of cases the needs presented towards a lab power supply are quite relaxed and usually within the low voltage range. With the modern component base the current consumption is usually also very low, and in a number of cases a large and fancy (and of course expensive) lab power supply could just be an overkill purchase for many users.

Pocket USB-powered power supply for the hobbyist – [Link]

21 Apr 2015


by Naomi Price & Martin Rowe @ edn.com:

USB data-acquisition modules offer good value and ease of use, which makes them an attractive choice for manufacturing test. But before you use the modules in a manufacturing test system, you need to take steps to protect them. During manufacturing test of circuit boards or subassemblies, a defect in an assembly may result in a condition that damages a data-acquisition module.

The typical USB DIO (digital I/O) module uses a set of 8-bit bidirectional tristate ports. Figure 1 shows a typical circuit that we test with one of those ports. We use one digital output pin from the USB module to drive the circuit and one digital input pin to read the circuit’s response.

Protect USB measurement circuits – [Link]

21 Apr 2015


microtherion has published new project the ChipHeadBang, that is available on Github:

Design for an USB to Serial converter with ICSP header for (slow) bitbang programming, based on the CH340G chip.

While this seems to work pretty well, and the CH340G can be obtained extremely cheaply from sources such as AliExpress, driver support can be a bit iffy. For current versions of OS X, the vendor provided driver will cause kernel panics, and as far as I know, only this commercial alternative will work

ChipHeadBang – design for an USB to Serial converter with ICSP header – [Link]

24 Mar 2015


by Abhishek Gupta @ edn.com:

In the last 14 years, the Universal Serial Bus (USB) has become the standard interface to connect devices to a computer. Whether it’s an external hard drive, a camera, the mouse, a printer, or a scanner, the physical connection to transfer data between devices generally is a USB cable. The interface is indeed universal.

USB technology has been under development since 1993. The first official definition, USB 1.0, was introduced in 1996. It provides a Low-Speed transfer rate of 1.5 Mbits/s for sub-channel keyboards and mice, and a Full-Speed channel at 12 Mbits/s. USB 2.0, which came in 2001, made a leap to Hi-Speed transfer rates of up to 480 Mbits/s. In 2010, USB 3.0 finally hit the market.

USB 3.0 – Everything you need to know – [Link]

16 Jan 2015


by simplicio @ instructables.com:

PUB! is a Programmable USB Button on which you can program a sequence of keystrokes. When you press the button those keystrokes are “replayed” over a USB connection.

The button (which is really a rotary encoder with a built-in push button switch) is programmed using an innovative and slightly quirky interface that does not require any custom software to be installed on your computer. All you need is a text editor like Notepad (for Windows) or gedit (for Linux).

PUB! Programmable USB Button – [Link]

30 Dec 2014


by robertgawron.blogspot.com:

If you have old USB headphones you can easily transform them to a USB sound. This card can be helpful during testing of home built devices connected to the speaker or microphone ports on the PC (for example A proof of concept of a simple sonar and Constructing a homemade microphone).

USB sound card made from a broken USB headphones – [Link]





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