bobmct

Member Since: December 17, 2009

Country: United States

Profile

Programming Languages

C/C++, Python, Java, Processing, Arduino, Ada, VHDL, Scheme, Visual Basic, Basic, Pascal, Fortran

Associations

IEEE, IEEE Computer Society, HKN

Universities

BSEE Texas A&M University 1987; MSEE, PhD Univ of Colorado at Boulder 1997, 2008

Expertise

Embedded Systems Design, Wireless Mesh Networking, Programming Languages, Digital Design, Computer Networking, Robotics, VHDL, FPGA applications

Interests

Open Source Hardware, Maker Faire, Hardware Hacking, Reverse Engineering, Robotics, Gesture Recognition, Wireless Networking, Digital Signal Processing, Microcontroller Applications, Embedded Design

  • Product COM-09259 | about 3 years ago

    I realize this is a rehash of what others above have said, but I got mine to work by doing the following.
    Getting the El Escudo to work
    Two problems:
    1. Must fix a mistake in the library code: Needed to make in EL_Escudo.cpp (thanks BMK):
    void EL_EscudoClass::on(char channel)
    {
    pinMode(channel, OUTPUT);
    digitalWrite(channel, HIGH);
    }
    void EL_EscudoClass::off(char channel)
    {
    pinMode(channel, OUTPUT);
    digitalWrite(channel, LOW);
    }
    2. They also recommend GND and HVGND are tied together. Look at photo (thanks miku) http://dl.dropbox.com/u/3551240/el-escudo.JPG . With the code change made above I also tried to see if the El Scudo would work without this jumber (between GND and HVGND), and it did work and it did work without it. I was using the EL_Blink.pde example when testing this.
    The above got things to work with a handheld 3V inverter (two AA battery powered) with the button pressed 3 times (a steady AC supply, no blinking) with the output of this inverter connected to the El Escudo shield’s “EL Driver Inverter Ouput” JST jack.
    The Arduino was powered from a 5VDC wall transformer (1A capacity) with the barrel jack plug connected either on the Arduino’s barrel jack connector or connected to the El Scudo’s “EL Driver Raw Voltage” JST connector.
    You will need to fabricate the strange El Wire plugs to JST plugs to make all the connections. In my experience above, the polarity was not a factor because the output from the inverter is AC and so is the input to the el wire.
    Hope this helps.

  • Product TOL-10617 | about 3 years ago

    I have been trying to use this device and still am having problems. I am using an Atmega328 at 3.3V, running at 8MHz and the example code from this page. I noticed in the schematic that there are pull-up resistors (4.7K) on the breakout board so I assumed that I do not need external pull-up resistors in order to use this I2C interface. Am I right?
    Has anyone else been able to get this to work with the example code?
    Also I have been searching for an Arduino library and example code without any luck. Has anyone found any working Arduino examples?

  • Product LCD-09363 | about 4 years ago

    When using this on the Arduino Duemilanove (328P), do you need to populate (surface mount) the resistors R5, R7, R9 and R11 on this shield?
    Looking at the schematic, do these serve as a voltage dividers if these digital signal lines are at TTL levels (+5V, 0V) from devices such as the Duemilanove?

No public wish lists :(