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31  Using Arduino / General Electronics / IC what is Pin 1 on: January 25, 2014, 07:16:11 pm
Normally pin 1 is marked on an IC with a cycle / dot. But how can I find pin 1 on attached IC an ADS1231 http://www.ti.com/lit/ds/symlink/ads1231.pdf
32  Using Arduino / Project Guidance / Re: Measuring the weight of a beehive on: January 18, 2014, 07:58:17 pm
Hi Lars, there is a recommendation for an ADS1231 as ADC: 24bit and 128x PGA sounds good to improve accuracy a lot:
http://forum.arduino.cc/index.php?topic=198139.0
33  Using Arduino / Networking, Protocols, and Devices / Re: SPI Load cell chip ADS1231 on: December 14, 2013, 08:02:04 pm
May you share your experiences. What load cell did you use, where you satisfied with the resolution in the end? I'm asking because I used an ADS1115 with an insufficient  gain amplifier, see http://forum.arduino.cc/index.php?topic=198139.msg1465975 - and a suggestion was the ADS1231.
34  Using Arduino / Project Guidance / Re: Measuring the weight of a beehive on: November 25, 2013, 05:05:11 pm
A single bee has a weight of about  0.1 g. So a big hive has 3-4 kg bees. But most changing factor relating to weight is nectar flow and evaporation. Bees bring nectar to the hive with 80 % water. Honey has in the end under 20 % water. The difference must be reduced by the bees.
35  Using Arduino / Project Guidance / Re: Measuring the weight of a beehive on: November 13, 2013, 03:54:25 pm
Power consumption can be done mainly by changing to an barebone Arduino setup, think the most cited article about this is http://gammon.com.au/power .

Quote
The initial outcome is that, to save power, forget about using a development board. Further savings (like reducing clock speed) would be overshadowed by the huge overhead of the voltage regulator and USB interface chip.

I think Lars used as OpAmp an INA333 as linked in an older posting above: http://bildr.no/view/1409684 and no additional ADC so there is really an option for better reading than 0.1 kg resolution.

I see this two options: Use an additional ADC plus OpAmp / PGA  or a chip who has both integrated, see my posting under http://forum.arduino.cc/index.php?topic=198139.0 - so you see, you are not alone. :-) you may also have a look at the Seeeduino Stalker who has a lot of build in (charger circuit, RTC, SD) http://www.seeedstudio.com/wiki/Seeeduino_Stalker_v2.3


36  Using Arduino / Sensors / Re: Load Cell and ADS1115 as ADC, do I need an additional OpAmp (e.g. INA125P) on: November 12, 2013, 07:02:37 pm
24bit sound good, and "Internal Amplifier, Gain of 128" also, but 10mV x 128 is still only 1.28V but I can use the 3.3V as Reference, or? Hmm, my (a big Europe) dealer http://www.rs-components.com has the ADS1231 not in stock. Seems the ADS1232 is the same with two channels.
37  Using Arduino / Project Guidance / Re: arduino uno and load cell 500kg problem on: November 12, 2013, 05:31:38 pm
What was the solution to your problem, data smoothing or ground connection? So other can learn too.
38  Using Arduino / Project Guidance / Re: arduino uno and load cell 500kg problem on: November 09, 2013, 08:14:08 pm
Did you use different power sources or do you use the same for Arduino and load cell (e.g. through Vin)? If not: Did you connect both GNDs?
39  Using Arduino / Sensors / Load Cell and ADS1115 as ADC, do I need an additional OpAmp (e.g. INA125P) on: November 09, 2013, 04:51:29 pm
I have this load cell a

Bosche H30A
- http://uk.bosche.eu/product.php?prodid=805
- Rated Output / Sensitivity 2,0 mV/V

and thought it is a good idea to use a

ADS1115 as ADC (16bit)
- http://learn.adafruit.com/adafruit-4-channel-adc-breakouts/overview

so it is better than Arduino's internal 10bit. I thought the internal gain amplifier of the ADS1115 would be enough. But after reading this posting http://forums.adafruit.com/viewtopic.php?f=25&t=42455 I doubt that this is sufficient.

40  Using Arduino / Networking, Protocols, and Devices / Re: How to connect a FTDI cable with GBoard? on: November 07, 2013, 05:21:26 pm
Sorry, RTS is on the FTDI cable only. Connect DTR - DTR on both boards, and CTS is not connected.
41  Using Arduino / Networking, Protocols, and Devices / Re: How to connect a FTDI cable with GBoard? on: November 06, 2013, 05:32:40 pm
Yes,

VDD33 - VCC
DTR - RTS

and CTS is not connected.


42  Products / Arduino Yún / Re: Mystery component on Yun board? on: November 05, 2013, 02:33:33 pm
An other mysterious formation is the four slight diagonal THT holes for header pins on the Wifi side and the six on the Ethernet plug. No labeling, any idea?
43  Products / Arduino Yún / LED on pin 13 is red! on: November 05, 2013, 02:20:21 pm
On the Yun the well-known on board LED at pin 13 is now red no more orange as on the Uno and other boards. So be not confused red blinking is green light on the Yun after uploading the standard test sketch! :-)
44  Products / Arduino Yún / Re: Arduino Yún first wifi access for configuration: not assign any IP! on: November 05, 2013, 02:14:39 pm
I checked my firewall (Win7 OS), for C:\program files\arduino\java\bin\javaw.exe and found some doublets--why there are doubles, I don't know--and tweaked this. After restarting Arduino IDE an error message about the driver appears. After restarting again the IDE shows up without any problem.

Now connecting and uploading a sketch via COM and also via Wifi is possible. I don't know what the solution was., I would recommend to check firewalls settings and I think the Yun needs more time than expected to boot up so be patient and wait a bit longer after powering. 
45  International / Deutsch / Re: Chart (Diagramm) Lösung für Arduino, freie Zeitwahl on: November 05, 2013, 06:26:46 am
Sehr cool! Pickst du für die abgespeckten Werte einfach jeden x-ten Wert aus dem Rohdatensatz oder mittelst du die werte, also z.B. für eine 10-Min Tabelle der Mittelwert der 10 ursprünglichen Werte? Ich verwende aktuell http://dygraphs.com/ arbeitet mit Textfiles und ist ganz nett auch für ein paar 10.000 Datensätze, irgendwann hört es aber dann doch auf und man muss sich überlegen, wie man die Daten verdichtet.

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