Most suitable driver chip

Started by in comp.arch.embedded11 years ago 21 replies

I have a matrix of LED's, six rows and seven columns: X X X X X X X X X X X X X X X X ...

I have a matrix of LED's, six rows and seven columns: X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Across the rows, the LED's anodes are common, and each row has a single microcontroller pin. Down the col...


Pull up resistor on the gate of a PMOS

Started by in comp.arch.embedded11 years ago 11 replies

I have a tri-colour LED which consists internally of two LED's that have a common cathode. The device has 3 pins (two anodes and...

I have a tri-colour LED which consists internally of two LED's that have a common cathode. The device has 3 pins (two anodes and one cathode). Using one microcontroller pin, I want to light the LED either red, green or off. The microcontroller's pin states are intended to be as follows: High = Light Red Low = Light Green Set as input = Light Nothing First thing I'll do is put a 200 ...


Keyboard Interrupt

Started by eneloop in comp.arch.embedded8 years ago 3 replies

Hello, my name is Sammy. I try to write an interrupt service routine for the keyboard interrupt. I'm using a Motorola 68HC08 and freescale's...

Hello, my name is Sammy. I try to write an interrupt service routine for the keyboard interrupt. I'm using a Motorola 68HC08 and freescale's Codewarrior. Port A is connected with a button. Port B is connected with LED. If I push the button, LED should switch on. If I push it again LED should switch off. I'm very unexperienced with C and don't know how to do this. #include


Stealth Blinky

Started by Tim Wescott in comp.arch.embedded8 years ago 14 replies

A long standing habit with me is to make sure that whenever possible, any processor for which do the system design blinks at least one LED...

A long standing habit with me is to make sure that whenever possible, any processor for which do the system design blinks at least one LED under software control, and has at least one LED on at any given time. This isn't just whim -- when you've got a headless system, and it's sick, you can knock down the top two problems by looking at the lights: "is there a light on?" -- yes, you've go...


Integrated LCD/LED display and numeric keypad

Started by klam in comp.arch.embedded13 years ago 2 replies

Hi Folk, I'm going to build a control system. And I want to find a low cost integrated LED/LCD (with one or 2 line is enough) display...

Hi Folk, I'm going to build a control system. And I want to find a low cost integrated LED/LCD (with one or 2 line is enough) display with a numeric keypad that can connected using RS232 interface (or USB). It seems that there are many separate RS232 numeric keypad and simple LCD/LED display, but not an integrated one. Could anybody point me some if you know such product. Many thank...


help with msp 430 interface and dip-switches

Started by bcincin in comp.arch.embedded12 years ago 3 replies

1- I got a board with dip-switches. How do they work? What do they use for? 2- I'm tring to do a c# interface to change baud rate of msp430...

1- I got a board with dip-switches. How do they work? What do they use for? 2- I'm tring to do a c# interface to change baud rate of msp430 but it does not work properly. I got a blinking led to see if it works fine. The problem is, when i change baud rate, led stops blinkind. When I set change it back to initial baud rate, led starts blinking again Code: #include void c


ready to run 32bit controller

Started by Paul Geisler in comp.arch.embedded9 years ago 14 replies

Hello, does anybody know a more powerful Atmel AVR pendant? Is there any 32bit controller that can make a LED blink with only controller,...

Hello, does anybody know a more powerful Atmel AVR pendant? Is there any 32bit controller that can make a LED blink with only controller, battery, resistor, LED? thanks very much Paul


simple question

Started by Anonymous in comp.arch.embedded14 years ago 1 reply
LED

Hello, I am getting my feet wet with a C8051F005. I am experimenting with C and ASM programming for it. Using sample code I have been able to...

Hello, I am getting my feet wet with a C8051F005. I am experimenting with C and ASM programming for it. Using sample code I have been able to play around with the LED (its associated with P1.6). I want to know how I can create a simple program to toggle on and off the LED with the built in SPST on P1.7 / SW2 ...I am quite unfamilar so any code examples (esp. those that explain intialization ...


LPC2103 (Phillips ARM7 microcontroller) Led Blinky Example

Started by Anonymous in comp.arch.embedded11 years ago 6 replies

All, For people who are learning the ARM7 architecture, and wish to use GPL development tools, then my LED blinky program may be of use to...

All, For people who are learning the ARM7 architecture, and wish to use GPL development tools, then my LED blinky program may be of use to you: http://www.users.on.net/~jsno/proj_micro/arm7lb.html I hope you find it a useful spring board. Cheers


IR and RED led SMD pack

Started by msr in comp.arch.embedded8 years ago 3 replies
LED

Hello, I need an SMD "pack" with IR and RED led for a pulse oximeter. Do you know where can I get this? Suppliers? Thanks! ...

Hello, I need an SMD "pack" with IR and RED led for a pulse oximeter. Do you know where can I get this? Suppliers? Thanks! --------------------------------------- Posted through http://www.EmbeddedRelated.com


100 LED's from a PIC - a different approach

Started by Scott Hooper in comp.arch.embedded15 years ago 6 replies

I recently posted a question here asking if anybody had thoughts on getting 100 LED's (not segmented displays) independently controlled by a...

I recently posted a question here asking if anybody had thoughts on getting 100 LED's (not segmented displays) independently controlled by a PIC16F84. As a complete novice, the responses confused the heck out of me. But I did glean enough to realise that maybe I could start with a better PIC. So I'm trying a different approach today. I've gone out and bought myself a PIC16F872 instead. Now th...


programming 8 character LED with C8051F022

Started by methi in comp.arch.embedded14 years ago 11 replies

Hi, I am using the Cygnal C8051F022 for the first time and have some background with C programming. I dont know where to start off...

Hi, I am using the Cygnal C8051F022 for the first time and have some background with C programming. I dont know where to start off with progamming an 8 character LED with C8051F022 though. Can anybody give me some ideas about this. Would be very helpful.Thanks, Methi


Rotary encoder interfacing to a micro

Started by Colin MacDougall in comp.arch.embedded15 years ago 15 replies

Hello, I am trying to connect an ALPS two phase mechanical encoder to a small micro ( AVR 90s2313 ). I can get it to work pretty much how I...

Hello, I am trying to connect an ALPS two phase mechanical encoder to a small micro ( AVR 90s2313 ). I can get it to work pretty much how I want - at the moment it causes a row of eight LED's to run back and forth. The problem I come across is that turning the shaft to the next detent position sometimes causes the LED's to double count. Looking at the output from the encoder on a scope re...


Tone Deafness

Started by Tim Wescott in comp.arch.embedded6 years ago 72 replies
LED

Like a good percentage of human males, I'm partially color blind to green and red. In my case, it's enough that I can't tell the difference...

Like a good percentage of human males, I'm partially color blind to green and red. In my case, it's enough that I can't tell the difference between a green or a red LED -- so a piece of equipment that depends on the operator being able to see the color of a bi-color LED is totally useless to me. Needless to say, this is irritating. Does anyone on the group know how many people are r...


FreeRTOS and ATMega8

Started by sap in comp.arch.embedded15 years ago 4 replies

Hi, Did anyone succeede using FreeRTOS on ATMega8? I changed main.c from the ATMega323 demo expecting to get a LED on PORTB.2 blinking but...

Hi, Did anyone succeede using FreeRTOS on ATMega8? I changed main.c from the ATMega323 demo expecting to get a LED on PORTB.2 blinking but this most don't work. Idle and Flashing threads start (at least code is entered) but I do not get the LED blinking whatever my routine is. I have not much debug tools... I tried to tweak parameters in portmacro.h (portMAX_PRIORITIES to 1, portMINIM...


trouble with logic counters

Started by panfilero in comp.arch.embedded12 years ago 5 replies

Hello, I'm trying to hook up a 74HCT163 to count from 0 to 7 then loop and keep doing it. I'm having a lot of trouble making sense of the data...

Hello, I'm trying to hook up a 74HCT163 to count from 0 to 7 then loop and keep doing it. I'm having a lot of trouble making sense of the data sheet on how to connect this thing. I have a 555 chip creating my clock, it's lighting an LED right now, I took that from the positive end of the LED and am running it into the counter. I was worried about going straight from the 555 chip to the cou...


Loss of synchronisation: Are the chips reliable?

Started by in comp.arch.embedded11 years ago 18 replies

A lot of you are familiar with the method of using a shift register to multiplex a matrix of LED's. My college project this year was to make...

A lot of you are familiar with the method of using a shift register to multiplex a matrix of LED's. My college project this year was to make a Connect4 game consisting of a 7x6 matrix of LED's. I had two choices for implementing the display: 1) Use two pins from the microcontroller 2) Use one pin from the microcontroller The technique of using two pins would be something like ...


Strange behavior of RA4 and RA5 on PIC18F242

Started by Paul E. Schoen in comp.arch.embedded12 years ago 6 replies

Hello, I am new to this NG, but my question seemed more appropriate here than on SED. I'm using a PIC18F242 for an SCR controller, and...

Hello, I am new to this NG, but my question seemed more appropriate here than on SED. I'm using a PIC18F242 for an SCR controller, and programming it in assembly with MPLAB 7.30. I am using RA4 as an Output On indicator, driving an LED and an optoisolator through a series resistor to +5VDC. I use RA5 to drive a status LED, low for green and high for red. Everything worked fine whe...


PIC 18F4455 simple project help

Started by CMOS in comp.arch.embedded11 years ago 8 replies

hi, i've started playing with 18F4455 device. im using MPLAB with c18 compiler student version. as a start what am trying to do is to light an...

hi, i've started playing with 18F4455 device. im using MPLAB with c18 compiler student version. as a start what am trying to do is to light an LED connected to pin 6 (RA4). here is the code. #include #pragma config WDT = OFF void main() { ADCON1 = 0x0F; CMCON = 0x07; TRISA = 0xCF; LATAbits.LATA4 = 1; while(1); } how ever the LED in the target circuit does not


[Slightly OT] Eurovision backdrop screens

Started by Mike G in comp.arch.embedded12 years ago 3 replies
LED

Firstly, my apologies to our friends over the herring pond for the Euro/UK-centric nature of this post (although I'm sure you have similar...

Firstly, my apologies to our friends over the herring pond for the Euro/UK-centric nature of this post (although I'm sure you have similar things in the US). Watching the Eurovision Song contest on Saturday night, I was impressed by the LED displays on both the backdrop and stage. What sort of processing is involved in these massive LED screens? Just getting them to sync must be a mammot...