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Hell-writing using a AVR keyer

There is no school like the old school and this fax technology from the 20’s using psycho-visual perception for image synchronization is just that.   A fax mark is represented by a carrier; and if...

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Be self-reliant, compost

Composting might not be the geekiest thing at the moment – no iPhone apps currently exist for it from what I can determine.  Nevertheless it has been happening on this planet since organisms started...

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A Logic Analyzer using Audacity

If you are interested in observing digital data lines, such as the I2C bus, but do not have a logic analyzer — yet are lucky enough to still have a parallel port on your computer, this hack (I won’t...

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Using V-USB and the HID Class (Part I of III)

USB can be quite a complex interface to learn. It is definitely not as easy to explain or as intuitive as the well known serial port. The specification for USB is hundreds of pages long. Books such as...

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Using V-USB and the HID Class (Part II of III)

The HID Interface All HID interfaces are required to have one IN endpoint, besides the control endpoint zero. If there is no IN endpoint, a HID device will not be created on the host. This is so even...

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Using V-USB and the HID Class (Part III of III)

Example Three Create a new example directory and set it up as before in example one. Next edit usbconfig.h and change the values to the following. Set USB_CFG_HAVE_INTRIN_ENDPOINT to 1, set...

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Easy I2C: Pull-ups optional

The I2C interface is relatively uncomplicated to write for on the AVR, not withstanding all the details of the protocol and all the messages generated by the AVR hardware. The more advanced AVR...

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DTR-less Reset Circuitry for the AVR

The USART-based bootloader is probably the most popular way of burning code to the AVR. The Arduino, for one, uses this method. For example say you were using a FTDI cable to talk to your Arduino....

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Training your PID

Control theory must be on the short list for the most important subject that no one talks about. Break open a hobbyist robotics book and you are lucky if control systems are even mentioned. Control...

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