Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hello
I need help with enabling Pattern Match filter on ENC28J60.
I use little modified example from ENC datasheet. ENC is supposed to respond
when encounter {0x09, 0x0A, 0x0B, 0x0C, 0x0D} at the beginning of data field
of incoming packet.
Here is my code:
#define Spi_Ethernet_HALFDUPLEX...
I do not know for RGB model, but for single color 16 x 32 dot chinese led modul there is 16 pcs of 74hc595 (1/4 refresh). Each panel have 74hc245 buffer on data, clk, latch and enable line. There is one NOT gate, i think on enable line, hc138 decoder and 8 pcs dual p-channel fet transistors in...
Re: Serial port programming in Visual Studio >Visual Basic> Windows form application
For VB6 you can use comm controll. You can download example here:
www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=72391&lngWId=1
This is example how to talk with serial eeprom.
Hi
I have question about pulll up resistors and ds1820 sensor.
If cable length between microrontroller and ds1820 is 1-2 meter,
where pull up resistor must be placed,
near microcontroller or near ds1820?
Thanks
You need to connect 10MHz xtal to PIC, and in configuration settings for xtal type choose HS-PLL. You may also need to define oscillator frequency to 40MHz.
Thanks for your answers.
@wavelet1208
I have one question. In your schematic I see only one 74hc138, and its 4 outputs are connected to 8 rows.
This means when you turn on first row, row 4 are also turned on, am I right?
How do you drive this display?
Thank you for reply.
I am doing display refresh from interrupt and while one row are displayed I'm sending data for next row, so there is no delay between.
This is my current design:
and I am thinking to change it to this:
and to drive simultaneously two group of shift registers.
At...
I need advice how to drive led display with 16x80 leds. My approach is to connect anodes to 4-16 decoder 74HC154, and cathodes to MBI5026GF constant current shift registers. Refresh display is 100Hz, and characteristics of leds I have are 3.0-3.2V, max. 18mA.
According to datasheet, MBI5026 is...
Hello all,
I'm intending to build led display with 16x80 resolution and I have few questions. First to say, I'm stuck with 8-bit pic because of the compiler I use, and I choose 18F8722. For driving rows my thought is to use 74HC154 4-16 decoder.
I'm not sure what memory to use for storing...
Hello
I need info or example how to build hardware watchdog for led matrix displays. I tried this circuit with hc123 and hc245. It works but when activated, display is not blank, but on, with about 20% intensity. Can you suggest me some better solution?
Thanks
Hello
I build led matrix display based on 16F876 and have problem with resetting pic in most of the time when neon light is turn off in the room and pic is connected to PC. When PC and PIC are disconnected everything is ok. Also every time PC is turn off, PIC is reset or gets stuck. Here is...
If you move while(1) statement above calls to shift_out_hc595() and latch_595(), then these two functions will newer execute.
<< and & are bitwise operators.
<< operator moves bits to the left, and
& is bitwise AND operator. It returns 1 if both bits are 1, otherwise returns 0.
Compile you...
Write this in main:
void main() {
TRISB = 0; // set PORTB to be output
ANSEL = 0; // configure AN pins as digital I/O
ANSELH = 0;
shift_out_HC595(0b00110011);
latch_595();
while (1) {
//
}
}
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
