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moving message display pcb design
Hi.. you better to check with multimeter first
for extra pin.. some time they have the same pin above and below so it mean you could use either of it. but it will be just 1 or 2 pin or maybe it not connect
bascom code and schematic for led moving display
Hi.. Most Commercial display will use Software on PC to set pattern and send text to it. Some will use keyboard or RS232.. .. Some display will use some special word to display pattern or picture like if in the string have "\p1" mean display...
Hi.. Sorry for late reply.. I was very bussy because I just Open my new Coffee Shop and Internet Cafe.. any way Here is Code and some Picture
Code is For ATMEGA32.. The reason is AVR Mega32 have 2k Of ram..
I use just a normal AVR Development board .. You can use any AVR board...
Hi.. if you use low Crystal for 89C52 and have a slow and long delay for 18S20 then it could slow for keyscan.. and also it is possible to use interrupt for keymatrix.. But for your code I think it should not be a problem. Try check your delay code first or you could also try put...
pc software for moving message display
Hi.. The reson that I use 74HC595 to Drive Transister for 8 Row Led because I could connect many driver board and still use only 3pins of micro controller to controll Row..
Another thing is if you connect long column for example 80 by 7 with only One ROW...
moving message display softwares
Hi.. My Schematic is OK.. Value for R is varies by Voltage Of LED
The input connector SV3 is V+ for LED that from Transister (In this part is Depend on which voltage you want to use..
Here a transister Driver that I use
For Me I use 5V and R220Ohm Drive 8bit...
Hi .. This is my PCB and Schematic of Dot matrix module. I devide my dot matrix to 8*20 (4 of 5* in to one module and connect each module as big as I want.
I use TPIC6B595 Power shift register and AVR 90S8515 with EXternal 32 K sram
SOurce will be follow
avr atmega bi color led matrix 16x64
I have done Project about 80 of 8*5 dot 5mm or about 3200 DOT..
It take current less than 2A when Fully Scan. Here Picture of it
(About 15 cm * 150 cm) note that my camera is fast shutter so the charactor wont
show right in picture because scaning...
Hi.. AT89C5131 will only in usb loader function when it in PROGRAMMING MODE.. You must enter programming mode before connect to FLIP..
Basic way to enter programming mode is to
put PSEN to Ground and Reset it.. Some board will have Psen switch and reset switch.. you need to push and hold PSEN...
measure current ?
Hi .. Try this circuit from this application note
**broken link removed**
I have used it.. Working good with CT and AVR.
Also if you want to get wave sign.. Use Opamp to bring up center of sine to positive so you could measure both side of amplitude in positive voltage. or...
Hello .. I bought a LPC2106 Chip from the shop and I would like to search for J-TAG schematic for it . SO I could build it by may self. I try to search this forum but I still not see schematic. I very new in arm so if you could give an example idea on how to download program...
Hi there are many way to orgenize it ..
for example you could use any charactor to define as a start charactor stream and then program to count amount of byte to receive and put each data to array or port.. You could also use serial interrupt for better receiving data stream
in case 2 some people were chose wrong fusebit about clock source. The crystall need oscilator circuit inside avr to make clock. So if you chose any other than crystall then oscilator circuit will not work so you need to put clock source that can generate clock by it self and...
you can erase the lock bit by erase chip methode. In your case i guest
1. You set wrong fusebit so make it not alow you to program with ISP methode so you need Pararell programming methode
2. You select a wrong fusebit on crystal selecttion may be you select it to use external clock system...
Hi Sharp GP2D12 is very easy to interface to Microcontroller that already have Analog to Digital
pic 16f676 can easy connect a2d pin to it or just use RCTime method to read out the voltage value that come out from it. If you not have any output first just check your sensor. If you feed 5 volt to...
ds1302 using 16mhz
Hi.. I have some trouble with DS1307.. I built a clock and I write software to read from DS1307 about every second... I found that time is not correct when operate about one day.. time will slower about 1 minute.. I think because I read from DS1307 every second.. IF I read it...
very low resistance measurements
for constance current source you could try **broken link removed** looking for 0-30 VDC STABILIZED POWER SUPPLY WITH CURRENT CONTROL 0.002-3 A
it could give you a constance current range up to 3 A
I used it with my Magnetic Field Tester and it works well.. I...