Arduino by Davis: “Re: Ardu-Acquarium Controller” plus 19 more

Re: Ardu-Acquarium Controller
is my Arduino dead?
Re: peizo knock Example
Re: "Dimmer" noob question
Re: Débuter dans les microcontrôleurs ?
Re: besoin d'aide avec des transceiver NRF24L01
Re: Info Clapper
Re: How to measure chip (or other component) temperature?
Re: Arduino Due libraries (official and 3rd party)
Re: Problema di amplificazione TEA5767
Re: peizo knock Example
Re: 350Mhz RF Remote. I know there is 315mhz and 433mhz.
Re: How to decode this
Re: speed test
Re: Variablenspeicherverbrauch reduzierbar?
Re: Serial.readBytes() question
Re: peizo knock Example
Re: Serial.readBytes() question
Re: Reset the Arduino Due board using the watchdog
Re: speed test

Posted: 09 Mar 2013 01:39 AM PST

di nulla, speriamo invece di risolvere

allora ora ho capito, la RRef è interna al sensore è serve per l'eventuale compensazione di temperatura, quindi il circuito originale lo devi sfruttare mettendo R1-R2 a 1,5kohm.
Invece tornando alla nostra prov...

is my Arduino dead?

Posted: 09 Mar 2013 01:39 AM PST

I have two identical units I hav built that run off of battery power to the VIN. One is a back up for the other. I have been using them for a while now but did some component changes last night and I did something wrong I guess. Not sure what though. I...

Re: peizo knock Example

Posted: 09 Mar 2013 01:34 AM PST

I did a bit of experimenting with thresholds and resistances, didn't seem to make any difference and I stopped when my eyes glazed over.

Maybe my piezo is indeed configured to buzz only, not sense.

Oh, and on the subject of buzzing, here's a big [color...

Re: "Dimmer" noob question

Posted: 09 Mar 2013 01:34 AM PST

Just tested the sketches with my Nano - and it works!
Is there no way for Processing to talk to Mega?

Re: Débuter dans les microcontrôleurs ?

Posted: 09 Mar 2013 01:33 AM PST

Au risque d'être passé à côté de l'info, je vois mal où est le rapport avec une pompe à vide... ^^'
[edit] je précise que je ne suis pas non plus un expert de l'arduino...

Re: besoin d'aide avec des transceiver NRF24L01

Posted: 09 Mar 2013 01:07 AM PST

J'utilise pas mal les NRF24L. Ca foncitonne plutôt birn ces bestioles.

Par contre j'utilise pour programmer l'arduino la librairie de maniacbug qui est très simple à utiliser et qui fonctionne très bien.

Essaye là ;o)

http://maniacbug.github.com/RF24/

Re: Info Clapper

Posted: 09 Mar 2013 01:06 AM PST

La cosa che mi pare strana è la poca escursione dei valore.
Probabilmente hai ragione e serve un pre-amplificatore. Potresti usare un op-amp. (Amplificatore Operazionale)

Re: How to measure chip (or other component) temperature?

Posted: 09 Mar 2013 01:04 AM PST

Just for laughs I tried the following experiment....

I put a 7805 on a 12V supply and loaded it with a 10 Ohm resistor. Voltages measured at 12 and 5, and current measured as expected (497 Fluke mA to be exact). (Yes the resistor is hefty enough: 10W)...

Re: Arduino Due libraries (official and 3rd party)

Posted: 09 Mar 2013 01:03 AM PST

Library: pwm01.h
Description: A clean alternate approach for setting up unique PWM frequencies from within a sketch, for any or all PWM pins. The trick is to utilize the two PWM clocks (CLKA & CLKB) provided by the SAM3X8E chip.

I wrote and enclosed...

Re: Problema di amplificazione TEA5767

Posted: 09 Mar 2013 01:03 AM PST

Possibili problemi:
- l'antenna non va bene ed hai delle riflessioni, prova a sostituire il cavo di rame con un cavo con impedenza compresa tra 75 e 125 ohm (es. un cavo TV con impedenza 75 ohm)
- prova a cambiare la costante di tempo di de-enfasi (cer...

Re: peizo knock Example

Posted: 09 Mar 2013 01:00 AM PST

For cleaning up the signal, try
http://leucos.lstilde.org/wp/2009/06/piezo-transducer-signal-conditioning/
and
http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/f2012/asj42_gs368_ln226_awh49/asj42_gs368_ln226_awh49/index.html

Re: 350Mhz RF Remote. I know there is 315mhz and 433mhz.

Posted: 09 Mar 2013 12:13 AM PST

Well I got home tonight and figured I'd look up all the values I've tried to use so far and come up with something. It took a couple hours, but It's a nice course in simple programming!

[code]

int inpin = 2; // makes the input pin pin 2
int outpin =...

Re: How to decode this

Posted: 09 Mar 2013 12:13 AM PST

polling version in pseudocode

Code:

byte = 0;
wait for low;
wait 1.5 ms;  // go to middle of start bit
for (int i=0; i< 7; i++)
{
  wait  3ms; // middle of next bit; 
  byte = byte << 1 + digitalRead(pin);
}

You can make it also interrupt base...

Re: speed test

Posted: 09 Mar 2013 12:12 AM PST

Quote from: CrossRoads on Today at 02:46:04 AM

If I remove some NOPs won't it go even faster?

Yes, but the hardware won't have finished clocking out the byte. So you will lose data.

Re: Variablenspeicherverbrauch reduzierbar?

Posted: 09 Mar 2013 12:11 AM PST

Das mit dem Table Lookup funktioniert garantiert. Wenn das nicht klappt macht Ihr was falsch. Hier ein Beispiel (für Quadratwurzeln und ohne Progmem, aber vom Prinzip her das Gleiche): https://gist.git...

Re: Serial.readBytes() question

Posted: 09 Mar 2013 12:08 AM PST

Well pointer math does solve this.. I'm just rusty - it would be *, not &. I'll see myself out now.

Code:

int bytes=Serial.available();
*buffer += startPosition;
Serial.readBytes(buffer, bytes);

Though if anyone wants to sugg...

Re: peizo knock Example

Posted: 09 Mar 2013 12:05 AM PST

I thank all who have commented, it all helps me. It helps in joining the Dots
You can probably see by my comments, I am mentally challenged when it comes to Electronics, and forums also for that matter.

I just tried another 1K resistor and it DID[...

Re: Serial.readBytes() question

Posted: 09 Mar 2013 12:05 AM PST

I actually have no idea what happened there.. browser error!

Re: Reset the Arduino Due board using the watchdog

Posted: 08 Mar 2013 11:59 PM PST

A software reset on the ARM7 chips, such as the LPC2148, was performed by setting the WDT to a very short period and enabling it:

[code]
WDTC = 0x00000FFF; // very short timeout
WDMOD = 0x03; // watchdog resets CPU
WDFEED = 0xAA; // s...