USB

Quick view of Acceleration sensing USB interface

The TiltStick is a small acceleration sensing device in form of a USB stick. It's using a two axis acceleration sensor to measure acceleration (caused e.g. by motion and tilt). The device is emulating a USB joystick and can thus be used in conjunction with any USB equipped host (e.g. a standard PC or the Nokia N8XX family) without any special drivers. The TiltStick is the successor of the Tilt Dongle for Palm OS. Two versions of the TiltStick have been designed based on different 2D accelerometer chips. The slightly smaller one is based on the Analog Devices XL203 (the XL202 may also be used). ..

i2c interface to USB interface

i2c interface to USB interface

The i2c-tiny-usb project is an open source/open hardware project. The goal of i2c-tiny-usb is to provide a cheap generic i2c interface to be attached to the usb. It is meant as a replacement for those simple and cheap printer port to i2c adapters. A USB solution has several advantages incl. the built-in power supply and a more future proof interface. Furthermore no cpu intense bitbanging is required on the host side. This USB solution even requires less parts than some printer port solutions. While the i2c-tiny-usb was developed under and for Linux it also works under Windows and MacOS X. A windows demo driver and demo application is included to get you started immediately...

LCD to USB interface

LCD to USB interface

LCD2USB is a open source/open hardware project. The goal of LCD2USB is to connect HD44780 based text LCD displays to various PCs via USB. LCD2USB was meant to be cheap and to be made of easily available parts. It is therefore based on the Atmel AVR Mega8 CPU and does not require any difficult to obtain parts like separate USB controllers and the like. The total cost (without display and pcb) are about 5 to 10 Euros. LCD2USB currently comes with a simple demo application that works under Linux, MacOS X and Windows...

USB selector switch

USB selector switch

To share a regional press like the USB printer, scanner etc. two computers, it is relatively easy. Just connect the two computers on a network device and say the printer as shared. This method however requires the continued operation of the computer we plugged the printer. Solution to above problem is to give the circuit that we present, and has the potential to be transferred to the printer on whichever computer we want, because the printer is connected to one of two computers, but in construction...

USB AVR programmer

USB AVR programmer

Nowadays, USB is the most popular connection connection between PC and peripherals such as AVR programmers, printers, scanners etc. For that reason I had to modify my old serial AVR In-System-Programmer (ISP) to work with USB connection. You can say, "use a USB to Serial adaptor to connect your AVR ISP with your PC". Yes, that could be a solution but it would cost me more money than a singe FT232BM chip because I had to include an USB to RS232 adaptor and a power supply for my programmer. (almost 30). So, the solution was to replace the two transistors, that were used to adapt the RS-232 voltage levels to TTL voltage levels, with a USB to RS-232 chip such as FT-232BM. ..

USB powered LED

USB powered LED

This is a simple LED circuit that takes power from the USB port. I needed this USB light since long time ago but, finally; I was able to build it. The circuit schematic is so simple: Just one resistor and one White LED. I did use a 10,000mcd white LED. It illuminates perfectly the keyboard of my computer. In fact; it is so bright that, I can use it to read. I did use an old USD cable. I took it from an old digital camera (Purchased for $19.99 USD. I remember the big soap opera that my ex-wife made just because I purchased that camera. Precious moments!) Anyway, I used about three feet [36 inches] of this cable. ..

USB digital I/O using PIC18F14

USB digital I/O using PIC18F14

The device is powered by the USB bus. The ports RB4-7, RC0-7 can be set on a bit-by-bit basis to input or output direction. All LEDs on the schematic are optional, and are only shown for testing the device. You can find the USB connector pinouts at http://pinouts.ws/usb-pinout.html. I have an SMD version PCB for the circuit, which will be published here. If you don't want to make your own PCB, you can buy an MCP2200 breakout board. The MCP2200 is a PIC18F14K50 mcu pre-programmed with firmware from Microchip...

USB sound card with PCM2702

USB sound card with PCM2702

If you use great IC PCM2702 from BURR BROWN / Texas Instruments you can create a fully functional USB sound card. This sound card can be powered from USB port and has one stereo output. You don’t need to install any driver for Windows XP and Vista, because they are already inside. This is really plug and play. The core of this construction is 16-Bit Stereo Digital-To-Analog Convertor with USB interface PCM2702. ..

USB Printer Chooser Switch

USB Printer Chooser Switch

With a DPDT switch, I can switch the two data lines. I tried connecting the shields from the two computers together, the grounds two computers together, switching the D+ and D- lines with the DPDT switch, and leaving the VBus lines float, but for some reason it didn't work. The Lexmark printer seemed to need to see the +5 Volts. It had been many years since I read the USB standard (It was USB 1.0 back then) and I did not recall a function for the VBus beyond providing power to the peripheral, but in true experimentalist fashion, I added a transistor switch to supply VBus to the printer from whichever computer was connected, and the printer started working. ..

USB Microphone Line Level Preamp

USB Microphone Line Level Preamp

The computer needs at least 180 millivolts peak-to-peak and the condenser microphone in my headset produces about 20 millivolts peak-to-peak into a 2.2k load with normal speech levels. There are USB ports on the machines, so I can use that for +5 volts. After a quick look in my parts boxes, I decided to put the input jack and output plug on the end of wires so I would not have to tediously mount them on the enclosure. The resulting goal was, therefore, a condenser microphone preamp with 19 db gain that is powered from a USB port that can be closed in a small box to hang off the computer and attach to the microphone lead on the headset. ..

Wireless XBee Accelerometer

Wireless XBee Accelerometer

The present document shows step by step how to easily build an interesting pointing device: the wireless tilt mouse, that allows to control the mouse?s cursor on the PC screen through the tilt of the board itself. The analog data from a 3-D accelerometer and from two push-buttons are acquired, converted and radio transmitted by an XBee module using the standard ZigBee protocol. On the receiver side there is another XBee module connected to the PC through an EasyUSB module, that allows both file storing and communication on the same interface and it?s seen by the PC as a common mass storage device. In practice there is no need to install any application on the PC: the software that communicates with the XBee and emulates the mouse functions is resident inside the EasyUSB itself and it is automatically recognized by the PC as an USB drive...

Breadboard header for ATTiny

Breadboard header for ATTiny

This handy breadboard header for ATTiny 25/45/85 microcontroller is a new design based on the original idea from Tinkerlog. Maybe the most useful feature is that it can provide power to the vertical breadboard strips while connecting all six port pins to the horizontal strips. Other features are :6-pin ISP connector (works great with USBtinyISP programmer). easily accessible reset button. header for optional ceramic resonator. power led indicator. smoothing caps. Measuring approx. 4 x 2.5 cm (1½ x 1 in) is a great addition to your breadboard projects saving lots of extra connections...

USB Development Board

USB Development Board

A little board with most of Microchip kit, but less parts then all these boards. Only the basic components to get the microcontroller up and running the Microchip USB Library examples. PIC18F14K50 is a really basic device and after some research I found what you can do and what you can not do with it: What you can do: USB HID (Human Interface Devices) like mouse, keyboards, sensors, serial-usb converters, etc. What you can not do: USB storage devices, like USB flash drives. USB storage is a problem because of memory limitations on PIC18F14K50 family. The circuit design is very simples. Basically all you need is PIC18F14K50; 12MHz Crystal; USB connector;The circuit still have a ICSP header for device programming and debugging. It's USB powered, so you can pay attention on current drain (500mA max.)...

USB Sound Card

USB Sound Card

The core of this construction is 16-Bit Stereo Digital-To-Analog Convertor with USB interface PCM2702. PCM2702 needs only few additional parts to work. The schematic is not complex. Sound card can be powered directly from USB port (jumper W1) or from external power supply (jumper W3). PCM2702 needs two power supply 3.3V (3V-3.6V) and 5V (4.5V-5.5V). I used fixed output voltage LDO TPS76733Q for 3.3V (IO2) and adjustable output voltage LDO TPS76701Q for 5V (IO3). Both LDO are produced by TI, I used this because I had it in my drawer. Any similar LDO can be used. Output voltage of IO3 should be set to little bit lower than input voltage to allow LDO good stabilization, in my case output voltage is set to 4.8V. Output voltage can be set by adjustable resistor R33. In case of low power supply, IO3 can be shorted by jumper W3. LED D3 signalizes power on...

USB Single Cell Charger

USB Single Cell Charger

Lithium Polymer Batteries are a very common source of power today. Many electronics gadgets have one inside, and they have some reasonable features. I've bought great batteries, with different sizes and capacities for my electronics projects. So long I'm using this batteries, coming the problem: charge them...