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Archive for October, 2010

Gallery – Hobbybotics PCF8574A I2C I/O Expander

The Hobbybotics I2C I/O Expander is based on the Philips PCF8574A.  The PCF8574A provides eight bits of I/O with the use of only two micro-controller pins.  Included are pictures of the first version of the PCB.  Go here and check out the pictures.

Project – Hobbybotics PCF8574A I2C I/O Expander

I added a project detailing my version 1 design of the Hobbybotics I2C I/O Expander based on the Philips PCF8574A.  The PCF8574A provides eight bits of I/O at the expense of only two micro-controller pins.  Analog pins 4 and 5 on the Hobbyduino double as the SDA and SCL I2C pins, respectively.  Check out the… Read More ›

Project – Hobbybotics Photo Interrupter V1.0

The Hobbybotics Photo Interrupter is based on the Panasonic CNZ1120.  A photo interrupter sensor is composed of an infrared emitter on one side and a shielded infrared detector on the other.  By emitting a beam of infrared light from one side to the other, the sensor can detect when an object passes between them, breaking… Read More ›

Gallery – Hobbybotics Photo Interrupter V1.0

I uploaded pictures to the gallery of version 1 of the Hobbybotics Photo Interrupter based on the CNZ1120. I screwed up a bit when I designed this board as I created the footprint for the CNZ1120 photo interrupter backwards. It still worked out in the end and I actually like it this way as it… Read More ›

Project – Hobbybotics Optoisolated Relay Controller

I have added a project detailing my design for an optoisolated relay controller.  I was looking for a simple way of switching high current DC and AC loads without the added expense of SCRs.  I can use this board to switch on/off lamps, a spindle motor for a CNC machine, or the heating elements on… Read More ›

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