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Shannon Hicks replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 1 years, 7 months ago
The ADC example I linked above from Sparkfun applies only to the onboard 10-bit ADC of the ATmega1284 processor. For the ADS1115 auxiliary ADC on the Mayfly board, the formula on the Sparkfun page does not apply, because the ADS1115 is a dedicated ADC chip and works differently. The operational specs of the chip are outlined in the TI d…[Read more]
dan@wachusett replied to the topic Modbus communications on Keller CTD Sensor in the forum Environmental Sensors 1 years, 7 months ago
@neilh20
Yes, I did get the Keller CTD. We had the budget and I was able to get an extra Hydros21 to deploy while figure out the Keller CTD. It took me a while to get the parts for the Modbus Wing shield and then build it, but I finally got them and had time to do it… so now I am in the thick of it.
I did follow instructions from the post you…[Read more]
Braedon replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 1 years, 7 months ago
I am confused on how we get the 0.1875 conversion factor for the 16-bit ADC. Does it operate on a different voltage? In my mind, if the board operates at 3.3 volts and there are 65,535 bits, then you would be multiplying the analog reading by 3300 mV / 65,535 bits, which is 0.050 mV / bit.
I’m asking because I am looking at connecting two apogee…[Read more]
neilh20 replied to the topic SDI-12 Slave in the forum Other Data Loggers 1 years, 7 months ago
Hi @dani68k, welcome to EnviroDIY.
I’ve not got any experience on the ATmega32u4, and as a small AVR processor I would think you would need to customize your development for it. SDI-12 bit banging is very sensitive (unrelaible) if the timing isn’t configured right. Possibly using the USART would be better for timeing, but configuring that is…[Read more]
neilh20 replied to the topic Systems not recognized from 12th( v0.15.0?) in the forum Monitor My Watershed 1 years, 7 months ago
Thanks to @ptomasula for fixing https://github.com/ODM2/ODM2DataSharingPortal/issues/658
If I understand it right, the internal redirection for POST to MonitorMyWatershed.org/api/data-stream/ HTTP/1.1 got broken with the upgrade to v0.15.0, and a http response of 301 was returned, which ModularSensors doesn’t handle. Of course its not a good…[Read more]
Shannon Hicks replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 1 years, 7 months ago
The calculation for the conversion of analog bits to voltage depends on the operational voltage of the system (3.3v in our case) and the resolution of the ADC. You can see an example calculation (and more importantly, the formula used) for a 10-bit Arduino here: https://learn.sparkfun.com/tutorials/analog-to-digital-conversion/all
Braedon replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 1 years, 7 months ago
Okay, thank you Shannon! I have a follow-up question. So when using the AuxAnalog pins, from my understanding you have to multiply the digital signal by 0.1875 to convert it to a millivolt reading. Would you need to do the same if you were to use the other analog pins (A0, A1, ,etc.), or is the 0.1875 value unique to the ADS1115 ADC?
dani68k started the topic SDI-12 Slave in the forum Other Data Loggers 1 years, 7 months ago
Hello,
I’m trying to create an I2C PH sensor over a SDI-12 bus.
I’m using a Arduino Leonardo to read sensor data over I2C and then send it to the datalogger over a SDI-12 bus.
I have a DIY datalogger with a commercial sensor with address 0, and my PH sensor, I just run the example there is the folder ‘example/h_SDI-12_slave_implementation’ with…[Read more]
dani68k became a registered member 1 years, 7 months ago
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@dani68k
andrew3000 became a registered member 1 years, 7 months ago
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