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5 Feb 2012

With this circuit you can log serial (UART) data to an USB thumb drive and record data over a long period without the need of a PC. Simply connect your system to the logger and plug in an USB keydrive. All incoming data is logged to a file on the memory stick.


  • No smd components are needed.
  • Firmware is open source.
  • Single power supply voltage: 5V (about 80mA).
  • Connection to your circuit with only three lines: +5V, GND, uC-Tx.
  • UART baudrate can be adjusted with a configuration file on the USB keydrive.

USBStickLogger – Log serial data to an USB thumb drive - [Link]

4 Feb 2012

coremelt.net writes:

Out of anger for a bad product from Conrad I developed this six channel relay card. It supports some nice features like USB and programmable timers. It can also be controlled manually or with a RC5 compatible remote control. Very handy when it comes to control light sources and computer peripherals from a terminal.

Six channel USB relay card - [Link]

4 Feb 2012

coremelt.net writes:

This piece of hardware enables you to connect a number of TWI sensors to your PC via USB. At this moment the board supports one SHT11 and up to 8 DS1621. These sensors can measure temperature (DS1621) and relatvive humidity (SHT11). A PC client is capable of writing the data into a MySQL database. The data can then be visualized with Gnuplot using the plotting tool, providing a multitude of options.

USB sensor board - [Link]

1 Jan 2012


This page describes hardware and software design for digital USB FM transmitter, called FmStick. This hardware does not contain analogue parts (except RF part). The main idea – is to create transmitter, that looks like usb flash stick. This idea is not new, You can see some of this designs in market, like Griffi RocketFM or Keene USB FM Transmitter, both avaliable on Amazon. But device, described below – is different. It does not have analogue sound parts at all, and it supports RDS, and it is powerful.

The main features of this device are:

  • Transmit Frequency: 76 … 108 Mhz
  • Transmit Power: -60 … 20 dBm[1]
  • Audio Compression: Yes
  • Audio Limitation: Yes
  • Audio Signal Measurements: Yes
  • Pre-Emphasis: 0/50/75 uS
  • RDS: Yes
  • RDS RadioText: Yes
  • RDS Time: Yes
  • Drivers Installation Needed: No[2]
  • Software Needed: No[3]
  • LEDs That shows state: Yes
  • External power needed: No

FmStick Digital USB FM Transmitter - [Link]

13 Dec 2011

jumperone.com writes:

On my desktop PC I have a speakers and a headphones. Usually I use headphones, but when I need to switch to speakers I need to physically plug in speakers instead of headphones to my PC’s soundcard. I wanted to solve this problem for a long time, but never get around of that until recently I saw this posted on Hackaday.

And so I’ve decided to build my own really simple audio multiplexer.

USB Audio Multiplexer - [Link]

3 Dec 2011

The FT232R is the latest device to be added to FTDI’s range of USB UART interface Integrated Circuit Devices. The FT232R is a USB to serial UART interface with optional clock generator output, and the new FTDIChip-ID™ security dongle feature. In addition, asynchronous and synchronous bit bang interface modes are available. USB to serial designs using the FT232R have been further simplified by fully integrating the external EEPROM, clock circuit and USB resistors onto the device.

The FT232R adds two new functions compared with its predecessors, effectively making it a “3-in-1” chip for some application areas. The internally generated clock (6MHz, 12MHz, 24MHz, and 48MHz) can be brought out of the device and used to drive a microcontroller or external logic. A unique number (the FTDIChip-ID™) is burnt into the device during manufacture and is readable over USB, thus forming the basis of a security dongle which can be used to protect customer application software from being copied.

The FT232R is available in Pb-free (RoHS compliant) compact 28-Lead SSOP and QFN-32 packages.

Single chip USB/UART FT232R - [Link]

21 Nov 2011

New DB9-USB connectors from FTDI enable to use a USB port in devices with UART interface without necessity of a PCB redesign.

By simple using of new DB9 USB connectors instead of original DB9 UART connectors, you can achieve virtually immediately a USB connectivity of your existing devices. If you from any reasons don´t wish to redesign a PCB, then these connectors are ideally suitable for you. Connectors DB9 USB contain a complete USB/UART converter circuit in their bode. So far these connectors were available in the RS232 logic levels version. Novelty from company FTDI are 4 new types supporting also 3.3V and 5V logic levels – DB9-USB-D3 and DB9-USB-D5, with a USB male or female connector.

DB9 USB family now contains 6 types for all 3 the most common logic levels, in a version with Male and Female USB connector. New connectors offer the same utilization comfort like other USB products from FTDI, DB9_USB datasheet and in the AN_149 application note. Free available drivers enable to use DB9 USB connectors as a Virtual COM Port (VCP).

Change UART to USB in an existing device! - [Link]

5 Nov 2011

Company Future Technology Devices International Limited (FTDI) extended support of its USB components even for connection to products with the Android operating system.

The first contribution is the release of the Application note AN_181 about accessing the „Android Open Accessory Mode“ with Vinculum-II chips. Open Accessory Mode is a new feature in of Android OS 3.1. whereby a USB host device can connect to the Android device to allow data transfer to and from the Android device over USB. FTDI chip VNC-II as a powerful 16 bit chip enables to add USB HOST capabilities to many devices thus enabling to use also this Android OS mode. AN181 document shows the access to the Open Accessory Mode on an example of a development board V2EVAL and the Motorola Xoom tablet combination. FTDI provides a full source code as well as precompiled ROM files.

The second contribution is the release of new D2XX drivers for FTxxxx chips usable for Android OS. D2XX API is common for all usual OS-es, namely Windows, Windows CE, Linux and Mac OS X. FTDI has now developed the port of D2XX drivers for Android OS including native JAVA interface code and a JAVA class. This enable an easy access to the driver from an Android application. FTDI releases these drivers as a beta-version and if necessary, you can contact the technical support at support1 [at] ftdichip.com. Detailed description is in the Technical note TN_134. Supplementary information about Adding FTDI Devices VCP Driver Support to Android is in the technical note TN_132.

Connect your USB applications to devices with Android OS! - [Link]

31 Aug 2011

The idea of this project is to control (switch off/on) two power sockets with a computer by using its USB port. I’ve chosen USB in first place because I wanted to experiment with the PIC18F4550 microchip’s microcontroller, and secondly because the power supplied by this port (500mA) is enough to activate a relay without any additional power supply.

USocket – USB controlled Socket with PIC18F4550 - [Link]

28 Aug 2011

www.adafruit.com writes:

This is an interesting native-USB hack. An atmel (1287?) with a microsd slot that ‘looks’ like an optical disk drive to allow booting. We think someone could probably hack this together using an our Atmega32u4 breakout board or Teensy, MicroSD breakout board, and a heavy dose of LUFA.

The Isostick – Optical drive in a usb stick - [Link]





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