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Braedon replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 1 years, 4 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]
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neilh20 replied to the topic SDI-12 Slave in the forum Other Data Loggers 1 years, 4 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]
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neilh20 replied to the topic Systems not recognized from 12th( v0.15.0?) in the forum Monitor My Watershed 1 years, 4 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]
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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, 4 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
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Braedon replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 1 years, 4 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?
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dani68k started the topic SDI-12 Slave in the forum Other Data Loggers 1 years, 4 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]
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dani68k became a registered member 1 years, 4 months ago
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andrew3000 became a registered member 1 years, 4 months ago
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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, 4 months ago
The ATmega1284P processor of the Mayfly is similar to other basic Arduino boards with the 324P processor in that it has an internal 10-bit Analog-to-Digital converter (ADC). There are 8 ADC pins on the 1284P, so these pins can be used to read analog voltages, however at a pretty coarse resolution (1024 bits over the 3.3v sample range). But t…[Read more]
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neilh20 replied to the topic Modbus communications on Keller CTD Sensor in the forum Environmental Sensors 1 years, 4 months ago
@dan-wachusett Gosh just seeing this – seems like you got that Keller CTD.
Just wondering did you follow the advice given from https://www.envirodiy.org/topic/keller-ctd-sensor/#post-16332
Partly its decoding the layers of software. The keller protocol is used to access the Keller CTD map. I find it most helpful to compare and trace how…[Read more]
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Braedon replied to the topic Mayfly v1.1 technical questions forum thread in the forum Mayfly Data Logger 1 years, 4 months ago
How do the analog pins found on the 20-pin header (pins A0, A1, A2, etc.) differ in function and purpose from the auxiliary analog pins (AA0, AA1, etc.)? From what I’ve seen, you need to connect analog sensors to the auxiliary analog pins and use an Adafruit library to get the millivolt readings because of an ADC they are connected to. I’ve…[Read more]
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neilh20 replied to the topic Power usage of Mayfly1.1 with Hydros 21 cTD and LTE BEE cell modem in the forum Mayfly Data Logger 1 years, 4 months ago
Some recent posts here explain the current difficult environment for calculating power usage on the mayfly as its dependent on a fast response from the server.
https://github.com/ODM2/ODM2DataSharingPortal/issues/649#issuecomment-1561690674
My implementation is to ensure that there is sufficient reservoir of power in the battery for taking…[Read more]
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Shannon Hicks replied to the topic Mayfly v.1.1 – Clarivue Turbidity Sensor in the forum Mayfly Data Logger 1 years, 5 months ago
There’s nothing to unsolder. Solder Jumper SJ25 has 2 small pads. By default, they are separated and not connected at all, and that makes the on-board boost circuitry output 12 volts. By putting a solder blob on SJ25 and connecting the 2 pads, you add some extra resistance to the circuitry that controls the voltage and it’ll output 9 volts in…[Read more]
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Steve became a registered member 1 years, 5 months ago
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EMayerRHA replied to the topic Mayfly v.1.1 – Clarivue Turbidity Sensor in the forum Mayfly Data Logger 1 years, 5 months ago
For clarification, 9 volts is stable – which requires de-soldering the 12 volt bridge and re-soldering the 9 volt bridge correct ? In the event all 3 soldering points are connected by accident what will the results be? Is there voltage protection or will it burn out the board?
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Shannon Hicks replied to the topic Curious sensor failures and cyclical measurements in the forum Mayfly Data Logger 1 years, 5 months ago
Have you tried disconnecting one sensor at a time and seeing how the other one performs? We’ve found that sometimes when one sensors fails or “goes bad”, it can cause erratic readings or performance of any other sensor that’s also connected. By unplugging each sensor independently, it’s usually easy to isolate which sensor was the actual c…[Read more]
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Shannon Hicks replied to the topic Mayfly v.1.1 – Clarivue Turbidity Sensor in the forum Mayfly Data Logger 1 years, 5 months ago
Is it a Mayfly 1.1 revB board? or a revA? That station seems to not have the usual 4.3v during the day that most v1.1revB boards get, and is more similar to the voltage one sees on a v1.0 or v1.1revA board. What solar panel do you have on that station, and is it in a very shady location, or is the panel pointed north?
All that being said, di…[Read more]
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EMayerRHA replied to the topic Mayfly v.1.1 – Clarivue Turbidity Sensor in the forum Mayfly Data Logger 1 years, 5 months ago
https://monitormywatershed.org/sites/RHA03/
Again, there are readings sometimes throughout the day, but then not. So I’m not sure what is going on here.
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Shannon Hicks replied to the topic Mayfly v.1.1 – Clarivue Turbidity Sensor in the forum Mayfly Data Logger 1 years, 5 months ago
-9999 is not an actual reading from the sensor, it’s what the Mayfly stores as the value when it doesn’t actually get a valid number from the sensor. You’d see the same thing is no sensor was attached to the Mayfly at all. What is the MMW station name or URL?
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EMayerRHA started the topic Mayfly v.1.1 – Clarivue Turbidity Sensor in the forum Mayfly Data Logger 1 years, 5 months ago
Hello,
We installed the new v.1.1 boards with a CTD sensor and also added the Clarivue Turbidity sensor. On the MMW platform it shows the turbidity sensor as reporting with a green background for the graph display, but the readings show as -9999.99 (which usually means its an error). Though when a large rainstorm comes through, it does report…[Read more]
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