Hello James, yes I have a few that are working, that’s the way that they have been working up to now. I would think you’d want to test to your 10 ASAP. For me the devices that did not work, they just they didn’t work. So for testing its they either work or not. As an electrical engineer I did do an analysis and laid out what I had done…[Read more]
In a nutshell, the low cost RS484 hybrid often doesn’t work. Technically the QA of the workmanship is untracked.
I’m working on a new Modbus wingboard and will be building and testing a small production prototype on Monday, and then looking to do initiate a small production run of it shortly thereafter, probably Tuesday.
This is personal initiative, and doesn’t have any institutional backing – I am using the excellent forum for discussion about – but if…[Read more]
My test06 system froze for a 2nd time. This time I pressed the User Button, which is also tied to an interrupt, and started up again. I have made some updates described here. https://github.com/neilh10/ModularSensors/issues/34
An update to my stability testing, this partly makes me collect the dates and status.
A test system “tu_rc_EC” standalone EC “Stream Disconnect” monitor built on 0.25.0 has been running since the beginning of Oct very well. I plan on describing this and haven’t done so yet.
The “TUCA-NA13” remote Verizon wireless system in the wilds measuring…[Read more]
Hello @shicks ~ I’m just following up on this as I’m respinning my Modbus Board https://github.com/neilh10/SensorModbusMaster/blob/release1/hardware/knh002-MayflyWingShield/rev6/knh002r6_rs485schematic.pdf
to have a SDI-12 interface, and your board got me thinking .
The Mayfly socket has +5V and +3.3V and the board can have the boosted +12…[Read more]
Hello @shicks thanks for the response. I was thinking partly of the SDI-12 specification modules driving 5V back into the 3.3V ports. The Insitu LT500 that I’ve been using does respond to Mayfly driving it on 3.3V, but then drives back SDI12 specified 5V which has to be mitigated.
Do you see any issues with the level shifter and the port…[Read more]
I was wondering does anybody have a suggestion for a hardware level shifter for the SDI-12 interface and if there are any software mods needed.
I’m interfacing to the LT500 that requires at least +8V, and drives back +5V from the SDI-12 half duplex line.
Right now I’m using a current limiting resistor, but it would be nice to figure out if I can…[Read more]
I wonder if anybody has been thinking/trying low cost cameras as a sensor.?
An email came through this morning https://os.mbed.com/blog/entry/Mbed-and-Arduino-Low-code-development-fo/
With a talk tomorrow Apr 14 (9am PDT?), https://www.youtube.com/watch?v=qflDRYLGuPI
Mbed OS Tech Forum, on Wednesday, 14th April 9am , hosts Alessandro and Do…[Read more]
I’ve been working on a next revision board. Details at https://github.com/neilh10/SensorModbusMaster/tree/release1/hardware/knh002-MayflyWingShield
I don’t have any time frame on availability due to the world wide shortage of parts, but probably third quarter this…[Read more]
I’ve created a low cost monitoring console using a Raspberry Pi and FTDI cable. This allows a release debug OUTPUT to be monitored just as if it was on the console and compared to https://monitormywatershed.org/
Thanks for the input, ~ Yup that is what did it for interfacing with the LT500. I brought in each change from Dec 1st till I found it
Doesn’t make a lot of sense to me why that impacts the protocol, but in dealing with a bug, the first stage is Detection, 2nd stage is Isolation, 3rd stage is Fixing it.
The Isolation in this case took a couple…[Read more]
I really appreciate there is a lot of work that has gone into the layers of SDI-12 protocol. I’m using it to communicate with the Insitu LT500. I only have one as they are expensive and its part of a project that can spare it at the moment. With the Arduino-SDI-12 v2.1.3 release the LT500 response has stopped being decoded, b…[Read more]
Another low cost depth sensor, showing the problems with using “raw sensing”, and the range is very small range 0-10cm and needs recalibrating evertime there is a power cycle. – https://www.vegetronix.com/Products/AquaPlumb/ – but my experiments have shown it has
My comment “Works pretty nicely, except after power off.
Can’t take power off w…[Read more]
If its the standard variable resistance then you should be able to just use the switched 3V. The ADS1115 is going to be more accurate.
FYI in case its of interest, I did some work with it and here is what I found out about the eTape; as I remember with the eTape, was that in calibration it wouldn’t register to the printed zero mark -…[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]
@mbarney the trace looks good for the waking portion. What I see on my system is that it wakes every minute and then sleeps inbetween. So if you have it on a 15minute setting it will do above, then sleep/wake 14times. The current can be read when it goes to sleep.
For the differential case I would think you would have two sets of dividers. BT…[Read more]
@mbarney an observation, the power is being turned off on the off board ADS1115, but not for the Turner. The ADS1115 Analog inputs are only specified for Vdd+0.3V. If either of the Turners inputs are above this, then it will feed through to the ADS1115 Vdd Sw5V. Probably won’t account for what your are seeing.
I found a I needed to know when i…[Read more]
Gosh @shicks that is great to hear. I wonder would you share how you made the sleep measurements with the microSD present. Any sketches for putting the mega1284 to sleep. Getting to 0.5mA would be fantastic!
Matt Interesting real data with a coulomb counter. Great stuff.
My current measurements on 0.28.01 for sleep are 2.5mA . I haven’t got a…[Read more]
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