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The analog reference voltage (AREF) pin of the ATmega1284P is broken out to the left-hand 2×10 header if you wanted to apply a voltage other than (and less than) 3.3v.  If you leave it floating and don’t specify the AREF in your code, then it’ll use the default 10-bit setting for any regular analog reading like you’ll find in most code…[Read more]

Is the 3.3 V for the 10-bit ADC on the Mayfly a value that is fixed, or can it be changed? I don’t know if this is related or not, but does the ADC voltage come from the default analog reference, or is it completely different? Could the analog reference voltage be lowered, using the analogReference() function, giving us a higher resolution as a…[Read more]

LTEbees should be back in stock later this week in the EnviroDIY shop and in a week or two on Amazon.  The big order we placed from our manufacturer back in March had some production delays but is supposed to be delivered this week.  The RS485 adapter is still not ready for release, the original design relied on the 12v boost circuitry of the M…[Read more]

I’m wondering when the LTE Bee modules and RS-485 adapters will be in stock. Thanks!

Hey thanks for the overview. Welcome to the art of jumping in – and learning by doing (my philosophy though I’m an EE graduate) – though its beneficial to bring an engineering basis to analyzing the components, and then plug the components together.  The engineering basis can be thought of as a technical story – though for EE graduates we talk…[Read more]

I am very new to the world of electronics and circuit boards. I am a graduate student of civil engineering looking to deploy snow sensing stations using the Mayfly. They will be satellite stations around an existing piece of infrastructure that already has radio communication set up with Campbell Scientific data loggers. I don’t think the network…[Read more]

Okay, so this is what I have now for my sender code:

#include <Wire.h>
#include "Sodaq_DS3231.h"

void setup() 
{
  pinMode(18, OUTPUT);
  digitalWrite(18, HIGH);
  Serial1.begin(9600);
  Wire.begin();
  rtc.begin();
  delay(3000);
}

void loop() 
{
  digitalWrite(8, HIGH);
  rtc.convertTemperature();
  
  Serial1.print(rtc.getTemperature());…

[Read more]

The Bee socket of the Mayfly board isn’t powered continuously by default, so in your code examples above, it appears that you’re not turning them on.  If you study the schematic for whichever hardware version of the Mayfly you have, you’ll see that you either have to activate the power to the bee socket’s regulator by setting Mayfly pin D18 high…[Read more]

Gosh Brandon, I successfully used the 900Mhz modules about 15years ago with the TinyOS framework.

Seems you are thinking of using it in a Peer-2-peer arrangement, possibly in a mesh configuration. A lot of options.

I wonder what your back ground is  – cause its sort of like jumping into the deep end, and you may wanna flesh out your plan – what…[Read more]

Hello, I am new to using Mayflies and XBee modules, so I’m hoping I can get some help here since the modules I’m planning on using are the 900 MHz XBee Pro S3B. Programming the modules correctly in the XTCU is something I don’t entirely grasp, but for the moment I will focus on programming the Mayfly.

Right now I am just trying to get two…[Read more]

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]

@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]

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]

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]

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]

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

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?