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Hi everyone,

Just a quick update.  The 100k voltage divider worked perfectly. My new voltage water level relationship is below.

Thanks again for your help @shicks.

James
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Hi all,

Just an update. I sent an email to the tech support team at Millonetech, and we were able to confirm that the eTape sensor I am using is not a resistance to voltage module (as I suggested above), but contains a simple voltage divider. This version works fine with 5v VCC, so that is not a problem.

I purchased some 100k resistors and…[Read more]

Thanks to both of you for your responses! I think I had just figured out the cause of my problem right about the time you were posting them, but needed to continue refining and testing my code before replying.

What’s working now is:

1. In the sensor’s setup() function, set trigger pin to an output
2. at powerUp(), set pin HIGH
3. at wake(), run the…

[Read more]

I would do as Neil suggested and make sure the trigger pin for the Turner is set low before sleep.

We’ve had the same problem with RS485 adapters that pull power through the Tx/Rx lines.  Because the stop bit is high those lines will stay high if you don’t force them low at the end.  It’s kind-of a PITA with the Tx/Rx bits; you have to actually w…[Read more]

I would say the sound of the disconnect/reconnect isn’t a good sign, but touching the black part of the antenna shouldn’t have caused anything.  If the board shifted onto something metal (aluminum phone or laptop case or such) that might have connected pins oddly on the back it might have caused a jolt in the power on the USB which can sometimes…[Read more]

@mbarney  its a common problem with low power, sleep circuits.

Just to be clear/restate what the issue is. When in “sleep” mode and powered off, all instrument pins (and actually all other processor pins) need to be set to output low, or input with preferably pull down.

On power-up, the pins are activated output and set high within 50mS so as…[Read more]

Thanks, I was more than 3/4 of the way through the two 3-hour workshops that Shannon Hicks recorded and had all of the parts connected and all but the Interfacing With Monitor My Watershed and the Final Steps left to go when this happened. I had about 50 minutes of the 6 hour workshop to go. Everything was connected and working fine until I found…[Read more]

Are you working through a tutorial to learn how to do this? Here’s a link to some tutorials. https://www.envirodiy.org/mayfly/software/

If you are just getting started with Arduino, I recommend starting in a generalized Arduino tutorial (not monitoring focused): https://learn.adafruit.com/series/ladyadas-learn-arduino. Here are directions through…[Read more]

Is this what you’re looking for? I got an error on that too and I don’t have the board connected to the computer yet. I was just trying to do the first steps in the Arduino program.

Arduino: 1.8.12 (Windows 10), Board: “Arduino Uno”

Sketch uses 924 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of…[Read more]

Trying to track down and eliminate my my Mayfly’s excessive power draw during sleep, I rebuilt my circuit to use the Mayfly’s onboard ADS1115 via voltage dividers, but got the same results; my sleep current is still around 6 mA. However, I discovered that if I disconnect the Turner’s wiper trigger wire from D10, sleep current drops to around…[Read more]

Try uploading a basic blink sketch using the Arduino IDE. I’m not sure from your description if the board even could be fried from what you did, but going back to something really basic would test this.

@w3asa @dbressler @movingplaid Jim is correct: comments made in the activity stream on the homepage do not get applied to the forum. This is a flaw in the software that runs the activity stream. I think it is needlessly confusing so I have disabled the display of the Comment link.

I just tried this with Safari on my iMac and the scroll works to change scale so must be a Chrome problem which I typically use.  I have Chrome Version 89.0.4389.82 (Official Build) (x86_64)

btw Robert S response didn’t show up in this thread

My problem is that GMI_EC1 has conductivity spikes up to 900,ooo µS. The TSA chart auto scales to that level.  If I hover over EC axis and left click I can shift the scale location but I want to hover around zero and expand the scale so the all the lower EC readings are displayed.  I could do this a few weeks ago and my mouse wheel is working on…[Read more]

No, there is not a built-in voltage divider on the Mayfly to protect either the 1284p’s 10-bit ADC or the auxiliary 16-bit ADS1115 ADC input.  The jumpers on the Mayfly that let you select the Switched 3.3 or Switched 5v only change the voltage that’s supplied to the Grove jack’s VCC pin.   There’s nothing to protect the Mayfly’s ADC inputs fr…[Read more]