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  • Open Logger Project : How to Make Printed Circuit Boards
    the board After the board has been sanded it must be cleaned to remove any traces of dirt or chemicals which may prevent the toner from sticking to the copper It is also important that the cleaner does not leave any chemical traces Chemicals like acetone nail polish remover or methylated spirits evaporate any traces of themselves and are ideal for this purpose After this the board is ready for the toner transfer In order to transfer the toner from the paper to the PCB you will need a hot clothes iron a flat surface and a container of warm water Toner has a reasonably high melting point thus it is best to set the iron temperature as high as it will go It is not uncommon for the paper to turn a light golden color during the toner transfer process When applying the iron apply it with as much pressure as possible After the iron has been applied for a few seconds the toner starts to melt and the paper sticks to the board When this happens start moving the iron around the paper to ensure that all areas are properly heated and have pressure applied to them otherwise areas under the steam holes or other uneven surfaces may not transfer properly When the ironing is finished a process which typically takes 3 6 minutes depending on board size drop the board in a container of warm water Sometimes at this point the board will actually sizzle because of the heat The board can then soak for 10 30 minutes or longer two circuit boards on the same sheet of copper soaking in water After the board has been soaked it is time to carefully peel off the paper Usually the paper will tear or won t come off properly It is only important to clear areas which will be etched any paper on the toner traces can stay removing paper after transfer process To scratch off the paper either rub it off with your thumb or use a toothbrush Toner normally adheres to the surface and will not easily scrape off so significant pressure can be applied board after toner transfer some of the traces need to be touched up with a marker At this point it is important to make absolutely certain that the traces are perfect If you are unhappy with the transferred results simply remove the toner with acetone and start again Small scratches and errors can be fixed with an etch resistant marker or Sharpie brand black permanent marker after the board has dried bits of paper can be seen covering small areas of the board after drying Areas which did transfer well and small remnants of paper over areas that should be exposed especially common over drill holes may be scratched off with a very fine artwork knife or scalpel If in doubt mark the traces with the etch resistant marker and make sure all component pads are free of paper as next

    Original URL path: http://www.openlogger.org/tikiwiki-2.2/tiki-index.php?page=How+to+Make+Printed+Circuit+Boards (2016-04-24)
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  • Open Logger Project : How to Make Printed Circuit Boards
    fine grit sandpaper or something similar Sand the board in a circular motion to create very fine scratches and remove any copper oxide which has formed on the surface of the board After the board has been sanded it must be cleaned to remove any traces of dirt or chemicals which may prevent the toner from sticking to the copper It is also important that the cleaner does not leave any chemical traces Chemicals like acetone nail polish remover or methylated spirits evaporate any traces of themselves and are ideal for this purpose After this the board is ready for the toner transfer In order to transfer the toner from the paper to the PCB you will need a hot clothes iron a flat surface and a container of warm water Toner has a reasonably high melting point thus it is best to set the iron temperature as high as it will go It is not uncommon for the paper to turn a light golden color during the toner transfer process When applying the iron apply it with as much pressure as possible After the iron has been applied for a few seconds the toner starts to melt and the paper sticks to the board When this happens start moving the iron around the paper to ensure that all areas are properly heated and have pressure applied to them otherwise areas under the steam holes or other uneven surfaces may not transfer properly When the ironing is finished a process which typically takes 3 6 minutes depending on board size drop the board in a container of warm water Sometimes at this point the board will actually sizzle because of the heat The board can then soak for 10 30 minutes or longer two circuit boards on the same sheet of copper soaking in water After the board has been soaked it is time to carefully peel off the paper Usually the paper will tear or won t come off properly It is only important to clear areas which will be etched any paper on the toner traces can stay removing paper after transfer process To scratch off the paper either rub it off with your thumb or use a toothbrush Toner normally adheres to the surface and will not easily scrape off so significant pressure can be applied board after toner transfer some of the traces need to be touched up with a marker At this point it is important to make absolutely certain that the traces are perfect If you are unhappy with the transferred results simply remove the toner with acetone and start again Small scratches and errors can be fixed with an etch resistant marker or Sharpie brand black permanent marker after the board has dried bits of paper can be seen covering small areas of the board after drying Areas which did transfer well and small remnants of paper over areas that should be exposed especially common over drill holes may be scratched off with

    Original URL path: http://www.openlogger.org/tikiwiki-2.2/tiki-print.php?page=How%20to%20Make%20Printed%20Circuit%20Boards (2016-04-24)
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  • Open Logger Project : How to Make Printed Circuit Boards
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    Original URL path: http://www.openlogger.org/tikiwiki-2.2/tiki-likepages.php?page=How%20to%20Make%20Printed%20Circuit%20Boards (2016-04-24)
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  • Open Logger Project : Available Sensors
    Resistance RFID Radio frequency identification RFID is an automatic identification method used in many products PIT tags are but one example each tag is encoded with a unique number The currently available scanners can only read tags that operate at 125kHz 135kHz tags can not be read yet Temperature Temperature can be measured in several ways The simplest method is to use a thermistor a resistor that restricts the flow of electricity inversely proportional to the temperature The temperature is read using a voltage divider that measures the change in voltage in reference to the maximum voltage using a second resistor of a known value Alternatively temperature can be measured using digital probe such as the One Wire Digital Temperature Sensor DS18B20 or LM35 Precision Temperature Sensor that can send the actual temperature at a greater resolution and without the need to convert an analog signal A thermocouple that can be used to measure very high and very low temperatures about 270 to 1370C Velocity Created by kelly Last Modification Sunday 22 of February 2009 03 41 13 UTC by kelly Similar Sidebar Menu Home Search Wiki Wiki Home Last Changes List pages Orphan pages Structures Articles Articles home List

    Original URL path: http://www.openlogger.org/tikiwiki-2.2/tiki-index.php?page=Available+Sensors (2016-04-24)
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  • Open Logger Project : Available Sensors
    available scanners can only read tags that operate at 125kHz 135kHz tags can not be read yet Temperature Temperature can be measured in several ways The simplest method is to use a thermistor a resistor that restricts the flow of electricity inversely proportional to the temperature The temperature is read using a voltage divider that measures the change in voltage in reference to the maximum voltage using a second resistor

    Original URL path: http://www.openlogger.org/tikiwiki-2.2/tiki-print.php?page=Available%20Sensors (2016-04-24)
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  • Open Logger Project : Available Sensors
    Search Wiki Wiki Home Last Changes List pages Orphan pages Structures Articles Articles home List articles Forums List forums Directory Browse directory File Galleries List galleries Sidebar Login Login as User Password Remember me Login I forgot my password Standard Secure Support this Site Please help support this site Contribute your time and knowledge to develop new projects and improve existing ones You can also make donations below to help

    Original URL path: http://www.openlogger.org/tikiwiki-2.2/tiki-likepages.php?page=Available%20Sensors (2016-04-24)
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  • Open Logger Project : Components Encyclopedia
    other components from damage due to excessive current Integrated Circuit IC A miniaturized electronic circuit consisting mainly of transistors as well as passive components that has been manufactured in the surface of a thin substrate of semiconductor material Integrated circuits are used in almost all electronic equipment in use today and have revolutionized the world of electronics Microcontroller A small computer on a single integrated circuit consisting of a relatively simple CPU combined with support functions such as a crystal oscillator timers watchdog serial and analog I O etc Program memory in the form of NOR flash or OTP ROM is also often included on chip as well as a typically small read write memory Thus in contrast to the microprocessors used in personal computers and other high performance applications simplicity is emphasized Some microcontrollers may operate at clock frequencies as low as 32KHz as this is adequate for many typical applications enabling low power consumption milliwatts or microwatts They will generally have the ability to retain functionality while waiting for an event such as a button press or other interrupt power consumption while sleeping CPU clock and most peripherals off may be just nanowatts making many of them well suited for long lasting battery applications Microcontrollers are used in automatically controlled products and devices such as automobile engine control systems remote controls office machines appliances power tools and toys By reducing the size cost and power consumption compared to a design that uses a separate microprocessor memory and input output devices microcontrollers make it economical to electronically control many more processes Printed Circuit Board PCB A printed circuit board or PCB is used to mechanically support and electrically connect electronic components using conductive pathways or traces etched from copper sheets laminated onto a non conductive substrate PCBs are rugged

    Original URL path: http://www.openlogger.org/tikiwiki-2.2/tiki-index.php?page=Components+Encyclopedia (2016-04-24)
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  • Open Logger Project : Components Encyclopedia
    of overcurrent protection device Its essential component is a metal wire or strip that melts when too much current flows which breaks the circuit in which it is connected thus protecting the circuit s other components from damage due to excessive current Integrated Circuit IC A miniaturized electronic circuit consisting mainly of transistors as well as passive components that has been manufactured in the surface of a thin substrate of semiconductor material Integrated circuits are used in almost all electronic equipment in use today and have revolutionized the world of electronics Microcontroller A small computer on a single integrated circuit consisting of a relatively simple CPU combined with support functions such as a crystal oscillator timers watchdog serial and analog I O etc Program memory in the form of NOR flash or OTP ROM is also often included on chip as well as a typically small read write memory Thus in contrast to the microprocessors used in personal computers and other high performance applications simplicity is emphasized Some microcontrollers may operate at clock frequencies as low as 32KHz as this is adequate for many typical applications enabling low power consumption milliwatts or microwatts They will generally have the ability to retain functionality while waiting for an event such as a button press or other interrupt power consumption while sleeping CPU clock and most peripherals off may be just nanowatts making many of them well suited for long lasting battery applications Microcontrollers are used in automatically controlled products and devices such as automobile engine control systems remote controls office machines appliances power tools and toys By reducing the size cost and power consumption compared to a design that uses a separate microprocessor memory and input output devices microcontrollers make it economical to electronically control many more processes Printed Circuit Board PCB

    Original URL path: http://www.openlogger.org/tikiwiki-2.2/tiki-print.php?page=Components%20Encyclopedia (2016-04-24)
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