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 11 
 on: Today at 03:19:22 am 
Started by rafasr - Last post by wpradana
Hi Nick, I interested in your PT100 schematic diagram.. That is for 3 wire or 4 wire PT100??

Here is a typical interface for 4-20Ma. I think it was for an ultrasonic flow meter. If your flow meter is a Hall effect device, there is a project that can be downloaded from Jaycar or Freetronics. PT100s are typically used with an op-amp.

 12 
 on: Today at 03:15:32 am 
Started by vince3011 - Last post by vince3011
Version Arduino 1.0.5. J'ai aussi essayé sous arduino 1.5.6-r2.

Pour la librairie, j'ai téléchargé celle-ci "https://www.pjrc.com/teensy/td_libs_OneWire.html".

Je l'ai placé après avoir dézipper dans ARDUINO => Librairie dans les deux version arduino et toujours la même erreur "Erreur de compilation"

Code:
Arduino : 1.5.6-r2 (Windows 8), Carte : "Arduino Mega ADK"

C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp:85:24: error: WConstants.h: No such file or directory
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp: In constructor 'OneWire::OneWire(uint8_t)':
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp:93: error: 'digitalPinToBitMask' was not declared in this scope
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp:94: error: 'digitalPinToPort' was not declared in this scope
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp:94: error: 'portInputRegister' was not declared in this scope
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp: In member function 'uint8_t OneWire::reset()':
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp:127: error: 'delayMicroseconds' was not declared in this scope
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp:134: error: 'delayMicroseconds' was not declared in this scope
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp: In member function 'void OneWire::write_bit(uint8_t)':
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp:157: error: 'delayMicroseconds' was not declared in this scope
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp:165: error: 'delayMicroseconds' was not declared in this scope
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp: In member function 'uint8_t OneWire::read_bit()':
C:\Users\CROVATTO\Documents\Arduino\libraries\OneWire\OneWire.cpp:185: error: 'delayMicroseconds' was not declared in this scope

  Ce rapport contiendrait plus d'informations si l'option
  "Montrer les informations de sortie pendant la compilation"
  était activée dans Fichier > Préférences.

 13 
 on: Today at 03:13:57 am 
Started by kenny0414 - Last post by carmeloco
Para leer 5 sensores, puedes usar un bucle FOR y guardar los resulrados en un array

Code:
for (int i=0; i < 5; i++){
     sensorValue [i] = analogRead (i);
     }

 14 
 on: Today at 03:13:55 am 
Started by Boffin1 - Last post by Boffin1
"What not a selenium rectifier or a catswhisker?"

Yes scratch the cats whisker around until the LEDs light  -  those were the days !

 15 
 on: Today at 03:13:32 am 
Started by twmarler - Last post by twmarler
Hi,
I am in the process of making a device that will fire a camera based on gps location. this camera firing device will take a starting gps coordinate and measure from that point to a set distance and then take a picture. this will be on a plane going almost 200mph taking pictures for google earth. i need a gps module that will be fairly accurate at that kind of speed. altitude doesn't matter it is just measuring distance. this is also only a prototype but i need it as accurate as possible for a reasonable price. any suggestions?

 16 
 on: Today at 03:05:06 am 
Started by pedr0 - Last post by pedr0
Yes, actually I knew I would need to read some theory about this, thanks bosleymusic for the sources  I will keep you posted, I do not think I could come out with my own encoding scheme, it is too complicated   for me now !

I was reading from the teacher website :

 https://ccrma.stanford.edu/~jos/

Do you think I can find the pdf version of the "PHYSICAL AUDIO SIGNAL PROCESSING" and "PECTRAL AUDIO SIGNAL PROCESSING" ? I found heavy to read at the PC, I tried to quicky google the problem buu I did not find them.

Thanks,
Pietro


 17 
 on: Today at 03:00:30 am 
Started by acboother - Last post by acboother
ACBooth

Excellent ! ! ! !

Sounds like something that will fit into an application I'm working on.

What would it take to arrange for a DL?

Experience level required??? smiley

hoke
You need to be able to write a script and run it on the Arduino to output data in string format according to some simple formatting rules. The download includes code samples and you can see/check your output in the Arduino IDE serial monitor window if you seem to have problems. Unformatted data/strings are simply displayed in the Enhanced Serial Monitor in the same way as the Arduino one.

The supplied code includes helper functions to make the formatting easy.

If your Windows PC is up to date there is no installation process. Copy it to where ever you want and run it.

 18 
 on: Today at 02:59:38 am 
Started by Jingbo - Last post by Jingbo
Hi, PaulS,
Thanks for your kind reply.
I want to use soil moisture sensor to measure soil water content. Now I connect arduino with xbee, sd card and sensor. Thus the Arduino is supposed to send soil water content which is the value of analog pin in ASCII to xbee.  Then the xbee communicates with another xbee which send data to the second arduino to record in sd card. How can I work it out?
Sometimes I also use one arduino to acquire digital and analog data at the same time. For this reason, What should I do?
Best regards
Jingbo

 19 
 on: Today at 02:55:51 am 
Started by blfuentes - Last post by blfuentes
After updating the OpenWrt version the network problems seems to be solved.

 20 
 on: Today at 02:52:38 am 
Started by PaulRB - Last post by bobcousins
The real Maple Mini has a pair of transistors which pull USB D+ to GND under software control, which I presume is use to force the PC to re-enumerate the USB devices.

However the generic board doesnt have this. So I think this is why I can't get it into perpetual bootloader mode.

That is a good observation! The Maple bootloader scheme hinges around being able to re-enumerate as a DFU device, so disconnecting the USB via the pullup is essential. I think this board has the pullup hardwired (still haven't found a schematic), which would require unplugging the USB cable to re-enumerate.

There is some info on the Maple bootloader here http://static.leaflabs.com/pub/leaflabs/maple-docs/latest/bootloader.html, clearly they had problems with their initial scheme.

Perhaps a simple Arduino style bootloader would be better for this board, using an FTDI serial to reset and enter the STM32 UART bootloader, then use something like stm32loader. Another option is STLINK.

To build a sketch for stm32loader (not using Maple bootloader), change the line in maple-asp/Maple/config.txt

maple_mini.build.ldscript=ld/flash.ld

to

maple_mini.build.ldscript=ld/jtag.ld

which gives it all of Flash and Ram to run in.

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