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31  Using Arduino / Sensors / ADS1231 and SPI [Load Cell and ADS1115 as ADC, do I need an additional OpAmp] on: January 28, 2014, 09:59:24 pm
Now I ordered some ADS1231 and my question is: How should I wire the chip to the Arduino using the SPI lib
http://arduino.cc/de/Reference/SPI

In the SPI lib I have:
MOSI, MISO, SCK, SS

On the ADS1231 I have, see page 16, http://www.ti.com/lit/ds/symlink/ads1231.pdf
DRDY/DOUT, SCLK, PDWN, SPEED
  • I think SPEED can I set LOW what a data rate of 10SPS means.
  • PDWN: This is NOT the same as SS (Slave Select)!!
    PDWN: "holding this pin [PDWN] low powers down the entire converter"
    But for SS: "When a device's Slave Select pin is low, it communicates with the master."
    What pin is SS on the IC, or do I not need it?  
  • SCLK is SCK - the only thing that is clear and
  • DRDY/DOUT is MISO is this the case, or? Do I need MOSI?
32  Using Arduino / General Electronics / Re: IC what is Pin 1 on: January 26, 2014, 08:48:19 pm
Thank you Mark, I haven't neither noticed the chamfered edge nor the light grey line in the data sheet. But that's it and perhaps the light line is a second indicator.

Interesting is also John's remark. Like reading maps: you know always the North. Is this the case on electronic parts too that writing orientation leads always to pin 1 on the lower left hand side. That makes it easy! Thanks for this helpful hint.
33  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
34  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
35  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.
36  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.
37  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


38  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.
39  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.
40  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?
41  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.

42  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.
43  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.


44  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?
45  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! :-)
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