All content on EnviroDIY is licensed as Creative Commons Attribution-ShareAlike 4.0. Hardware designs on EnviroDIY are released under the CERN Open Hardware License 1.2. Alternative licenses are available. Learn more
All content on EnviroDIY is licensed as Creative Commons Attribution-ShareAlike 4.0. Hardware designs on EnviroDIY are released under the CERN Open Hardware License 1.2. Alternative licenses are available. Learn more
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Cal replied to the topic Deep Cycle 12v Battery Recommendations in the forum Mayfly Data Logger 2 years, 9 months ago
After struggling with power problems for years and buying several brands of 12v batteries and also using multiple batteries in parallel, I discovered I was looking in the wrong area. The solution for me was to find where power was being used and replacing inefficient modules with efficient ones. And the problems I found were surprising and p…[Read more]
dan@wachusett started the topic Deep Cycle 12v Battery Recommendations in the forum Mayfly Data Logger 2 years, 9 months ago
Can anyone recommend a good 12v deep cycle battery for use with the Mayfly 0.5 board. I have a station that gets very little sun and would like to be able to power it for long periods of time and swap out the battery a couple times a year. I did some looking around and the variation of specs and pricing made me unsure of which would be the most…[Read more]
dan@wachusett started the topic Monitoring Buoy on Reservoir/Lake in the forum Infrastructure and Equipment 2 years, 9 months ago
My agency is interested in developing a Mayfly based monitoring buoy for short-term deployment (days or weeks) on a reservoir. I figured I would reach out on the forum to see if anyone here has tried doing this and has any design tips/advice. Any photos, schematics, or parts lists would help enormously.
Thanks in advance!
Dan
neilh20 started the topic RS485 Schematic in the forum Mayfly Data Logger 2 years, 9 months ago
HI @shicks, just wondering could you post the schematic/parts on the “RS-485 Half-shield”
https://www.envirodiy.org/product/envirodiy-rs-485-half-shield-pack-of-5/ Says “Product expected to be in stock and ready for purchase in mid-October.”
Do you have any availability on it, and also when there might be a working +12V boost ~ very broadly Q2…[Read more]
Matt Barney replied to the topic Voltage divider on multipurpose screw adapter in the forum Mayfly Data Logger 2 years, 9 months ago
Thanks for the schematic – that is helpful. I removed the solder blob using solder wick and re-added it to the res-div position, but it wasn’t pretty; it looks like I overheated the board a bit, but it still works. Later, I found a different technique in this video, which I’ll share here for anyone else who needs it.
Shannon Hicks replied to the topic Voltage divider on multipurpose screw adapter in the forum Mayfly Data Logger 2 years, 9 months ago
Sounds like modifying your Grove cable to connect the resistor pair to your differential input is your best bet. Here’s a schematic of the multi-purpose screw terminal board if that helps. The gray area on the 3 solder jumpers in the schematic shows the default position of the jumpers. If you’re putting resistors in R1 and R2, you’ll want to ch…[Read more]
Matt Barney replied to the topic Voltage divider on multipurpose screw adapter in the forum Mayfly Data Logger 2 years, 9 months ago
FYI, Turner tech support tells me that Signal Ground and Supply Ground must be “Kept separate so that noise isn’t injected into the response.”
Matt Barney replied to the topic Voltage divider on multipurpose screw adapter in the forum Mayfly Data Logger 2 years, 9 months ago
Thanks Shannon. I’m not positive that I need to use differential measurement… I’m approaching the edge of my knowledge as a non-EE. Turner doesn’t specify whether it’s OK to connect signal and power grounds to the same point — maybe I’ll ask their tech support. But when the sensor is on, I’m measuring around 13 mV between its signal ground and…[Read more]
Shannon Hicks replied to the topic Voltage divider on multipurpose screw adapter in the forum Mayfly Data Logger 2 years, 9 months ago
Hi Matt, sorry I didn’t see your original post from last week. You are correct in how the resistor divider works, we have several sensors that have a 0-5v DC output, so dividing it in half makes it safe to read with the 3.3v-based circuitry of the Mayfly’s ADS1115. However, you can also use mismatched resistors to create a divider for s…[Read more]
Ken became a registered member 2 years, 9 months ago
Ken
@kmagliet