Voltage changes when multiple leds are on

-

hi. i'm not sure if correct place ask... i'm using multiplexers , shifters guess ...
it's not annoying problem want know if normal.
i'm making midi sequencer 32 pots , 8 leds. 32 pots 2x 4051 , 1x 4067(not yet ) , hc595 8 leds.
i'm supposed read  0-1023 on analog input, right. when led on(on hc595), read 4-1021, when 5 or 6 leds on, it's worse, reads 80-960~. doesn't bother me because need 1 led on @ time...
measure voltage @ 5v pin , 5v when led off, , 5.06v when it's on.
right don't have schematics, , code shifter library example bildr plus mux code. if schematics needed tell me , draw, have anyways.
thanks

need schematics please.

here's start using expresspcb schematic software.
pretty easy use.
http://www.expresspcb.com/expresspcbhtm/download.htm

can highlight components & ctrl-c, ctrl-v copy & paste.
don't forget 0.1uf caps on ic's power pins.


Arduino Forum > Using Arduino > LEDs and Multiplexing > Voltage changes when multiple leds are on


arduino

Comments

Post a Comment

Popular posts from this blog

Convierte tu Raspberry en un NAS. Firmware fvdw-sl 15.3 - Raspberry Pi Forums

-
¿conocéis este proyecto? fvdw-sl 15.3 para raspberry pi. convierte la raspi en un nas. http://plugout.net/viewtopic.php?f=31&t=1880 llevo tiempo intentando encontrar la forma de hacer que una de mis raspberry se comporte como un nas. configurando samba, minidlna, transmision, ftp, nfs, etc. pues con esta distribución lo tengo todo hecho. lo instalé ayer y me tiene soprendido. ahora mi raspi es un nas, hecho y derecho. caracterísitcas. - interfaz web. que cambia en función de si eres el administrador o un usuario. - gestión de usuarios. puediendo dar distintos permisos carpetas y funciones. - gestión de carpetas - vpn - ftp - nfs - webdav - varios servidores dlna como minidlna, townky, etc - varios gestores de descarga como transmision, mldonkey, etc - gestión de periféricos usb como impresoras o webcam. - gestión de cron para automatizar procesos. - creo que se basa en arch linux. por cierto, estoy creando una tarea para que me exporte un archivo txt del dis...
Read more

How to format a Get Request

-
i have external server running mysql. have installed php script that, when accessed http deliver data 1 of tables. works fine browser: code: [select] http://www.seti.net/php/getevents.php i cannot figure out how send command arduino. have ethernetclient library working , can access google in example. when send command through client: code: [select] client.println("//get /php/getevents.php http/1.0"); the server returns: code: [select] </head><body> <h1>method not implemented</h1> <p>get /php/getevents.php not supported.<br /> what correct way format in arduino? i use send temperature web server. note lack of http version , additional blank line after - not sure whether difference important works: code: [select] void  sendtemptoserver() { char getrequest[80]; if (client.connect(server, 80))   {   sprintf(getrequest,"get /cgi-bin/arduino.cgi?reading=%s&arduino_id=23&sensor_id=1",t...
Read more

avrdude: verification error, first mismatch at byte 0x0000 0x0c != 0x62

-
hello, im confused uno r3, uploaded code quite few months in uno, working fine. now without having altered of circuits, trying upload code changes,im getting strange error "avrdude: verification error, first mismatch @ byte 0x0000          0x0c != 0x62" i tried research able solve issue,  im running kind of fuse bit being changed or clock speed altered, im pretty sure did not play around these items. any people, please . . thanks taz Arduino Forum > Using Arduino > Installation & Troubleshooting > avrdude: verification error, first mismatch at byte 0x0000 0x0c != 0x62 arduino
Read more