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11
Programming Questions / Re: Matrix calculating
Last post by cr0sh - Today at 01:48 am
Have you tried googling "arduino linear algebra library"? I am almost absolutely certain one exists without even having to do so myself. For you to be an engineering student, and not know how to search for this (let alone implement it yourself - basic linear algebra is usually taught much earlier than college/university) vexes me.
12
Ok I've got access to a 12V lead acid battery.

So I dont have the FQP-50N06L N-mofset but I have:

1. K2996
2. IRF510
3. 2N7000
4. TIP120 (BJT)

Could someone guide me through what I need and why I need that?  I understand the Gate-Source and Drain-Source voltages are important.

I have 2 valve options:

1. Current: 2.5A/12VDC
2. Im looking for the other specs buts its a small solar water heater valve.  Its 12VDC but I dont know the amperage

1. How could I find the amperage on my other solenoid?
2. What specs should I look for in the K2996, IRF510 & 2N7000 mosfets and why?

Thanks
13
Displays / Re: Samsung LED Wallet Cover d...
Last post by bodmer - Today at 01:45 am
Original post looks fine to me.... :smiley-confuse:
14
Sensors / Re: Interfacing Thermistor wi...
Last post by knut_ny - Today at 01:44 am
I dont know maestro i detail, but it cannot be that difficult.. I'll come back to this tomorrow. (now local time 01:44)
15
Project Guidance / Re: LED dimmer problems
Last post by andy120 - Today at 01:43 am
Success at last. Worked on a test LED but was full on only when installed. Puzzled me. It dawned on me that maybe the chassis earth I was using wasn't good enough, so I added a new earth from most of the LED's to the board and a new chassis earth. That did it.

Andy
16
Microcontrollers / Re: 328P at 20MHz - partial su...
Last post by john1993 - Today at 01:42 am
By the way, how did you obtain or build this one?
I would very much like to be able to compile my own, as I like both 328's and 1284's.
so long ago i dont recall but definitely not from the original c code.  maybe disassembled asm or more likely i just poked a new divisor byte into the hex file with a text editor.  neither of much use to those who like to play with source.

Maybe if others are interested, we could end up with a comprehensive tutorial that would become a sticky on this forum.
not likely.  those in charge seem to think things like adc benchmarks for strange mcus are far more important than saving thousands of man hours noobs chasing their tails.  depending on what you find maybe westfw will include in his "newer new" post which imo is one of the few useful stickies.  20mhz is very popular clock and a shame no official opti.
17
RTClib.h which now comes as an included library with the IDE has a Class called RTC_Millis() which uses all the library RTC functions but using the internal millis() clock.  The time has to be initialized before use and fails with rollover.
18
Hardware / Windows reconoce arduino pero ...
Last post by Tball - Today at 01:41 am
Hola gente del foro.

Estoy teniendo algunos problemas con el arduino nano v3.0.

Estaba probando un circuito y tenia conectado un amperimetro (tester) el cual tenia la punta apuntando hacia el circuito. Este amperimetro media la corriente que entregaba un transformador con 19V que iba hacia un regulador que lo convertia en 9V. En las pruebas del circuito un cable, que era el Vin del arduino, se desconecto y toco esa punta.

Luego de lo sucedido el arduino dejo de ejecutar el programa y no reiniciaba el arduino pero el led PWR seguia encendido y al conectarlo a la computadora windows lo reconoce sin problemas pero al intentar subir el programa genera un error y la placa no enciende el led L y Tx o Rx.

Antes habia creado un tema el cual era la inversa de este problema "windows no reconoce arduino pero ejecuta programa" entonces pense...... Si cambio la parte funcional de un arduino por la que esta dañada del otro?


y aca viene la pregunta: Esta dañado el microcontrolador atmel 328p ? o es otro componente?


Este es el mensaje de error al subir el programa:

Code: [Select]
Arduino:1.6.6 Hourly Build 2015/10/08 05:43 (Windows 7), Placa:"Arduino Nano, ATmega328"

El Sketch usa 1.030 bytes (3%) del espacio de almacenamiento de programa. El máximo es 30.720 bytes.
Las variables Globales usan 9 bytes (0%) de la memoria dinámica, dejando 2.039 bytes para las variables locales. El máximo es 2.048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xe1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xe1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xe1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xe1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xe1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xe1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xe1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xe1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xe1
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xe1
Problema subiendo a la placa. Visita http://www.arduino.cc/en/Guide/Troubleshooting#upload para sugerencias.

  Este informe podría tener más información con
  "Mostrar salida detallada durante la compilación"
  activala desde Archivo > Preferencias



Gracias!
19
Displays / Re: Common cathode or anode......
Last post by bodmer - Today at 01:40 am
But the same argument dictates common cathode if multiplexed.

Yes, this is because switches are needed on the high side and low side, and it is best if the low side transistor carries the current from more segments viz use common cathode.  On the other hand it is nice to have the current limiter (eg resistor etc) on the high side since that makes the circuit more robust to accidental shorts of the LED terminals to ground (so common anode tends to be preferred in that case).

If you are driving the LEDs direct with an Arduino then common anode is best as the output transistors dissipate less.

So it is swings and roundabouts. Decide how you will drive them and choose the LED accordingly.
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