USBtoparallel

This device was built using AVRUSB firmware developed by extern Objective Development.

Meanwhile, a very similar Release 1.6 exists.

This Low-Speed device violates following USB specification rules:

* Detachable cable (must be captive for Low-Speed)
* Output drivers with 5 V (must be 3.3 V, but USB is 5 V tolerant)
* No differential data input (only one line D- is sampled)
* No data clock regenration while receiving (only at packet start)
* No error detection of input data (OUT direction), no time for CRC16
* Data transfer using BULK pipes (not specified for low-speed, but works on Windows – for Linux there is an “Alternate Setting” with INTERRUPT pipes instead)

However, new to this firmware, following rules are accepted:

* Suspend detection and lowered suspend current (below 500 µA)

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I have done a simple infrared remote control receiver with RS232 ascii output. It can be used for developing remote controls on a PC using the serial port. In practice, the infrared bursts are converted in ascii characters and sent to the RS232 port. The downloadable ZIP file contains the schematic diagram, the printed circuit board, the components disposition and the object file to write into the ATMEL ATtiny2313 microcontroller.

Link [Via]

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Serial RS232 to USB

This is simple RS232 Serial to USB Converter that doesn’t need any further explanations. You can use it for any projects that might need it.

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