Graham,
I see that your ultrasound sensor is the
https://www.dragino.com/products/distance-level-sensor/item/161-ldds75.html
available from
https://www.iot-store.com.au/collections/sensors/products/ldds75-lorawan-waterproof-distance-detection-sensor
7500mm range for $139
or the sensor alone from
https://www.digikey.com.au/en/products/detail/dfrobot/SEN0313/11202720
for $51
I'll order one, thanks.
-
Regarding the failure to obtain meaningful results from the microwave
sensor, I'm wondering if that could be related to the rather wide
acceptance angle of the device?
I'm guessing that yours may have been the $229 24GHz device at
https://www.dragino.com/products/distance-level-sensor/item/197-lmds200.html
which cites 'Horizontal Angel: 78° Vertical Angel: 23°' (sic!)
The $229 60GHz device at
https://www.iot-store.com.au/products/mds120-lb-lorawan-distance-sensor
quotes 'Measurement Angle: 25 degrees horizontal and 23 degrees
vertical' may be more suitable for the applications. I'm flirting with
ordering one of these...
The images of these show no antenna horn, so I'll look into making up a
horn to contain the uWaves into a narrower beam. The very short
wavelength (~12.5mm) will doubtless make for a challenging build, also
that the Tx & Rx antenna are separated.
24GHz Microwave Radar Sensor
<https://core-electronics.com.au/24ghz-microwave-radar-sensor.html>
Perhaps you could do some beamwidth tests on yours? If it really is 78
degr wide, then perhaps that axis could be aligned up/downstream, to
avoid bridge pylons and streambank?
We envisage attaching the devices to a public bridge, on many of these
the 7.5M range limitation would not reach to the normal water level.
Therefore I'm also looking at the microwave devices with their claimed
20M range.
Your site is an inspiration!
Thanks
PS: Regarding the immersion pressure sensor, I did buy one of these, but
due to the requirement for a metal tube to contain it, and our intended
placement on public bridges, we are looking instead at the remote
sensors. You might consider
https://core-electronics.com.au/gravity-throw-in-type-liquid-level-transmitter.html
$86 and
https://www.iot-store.com.au/products/serial-bridge-lorawan-converter $129.
Greg Hall
0265504481
0428850144
VK2GTH
-
On 11/11/23 12:52 pm, Graham Eddy wrote:
river level sensors:
* my dragino lorawan ultrasonic sensor has been fine, though it has
condensation problems (to be fair, it is mounted under a bridge a
couple metres above normal river level)
* my dragino lorawan microwave radar has been a failure. i get
neither accurate nor consistent measurements and can’t see any way to
use the readings i get
* my old aquagauge differential pressure sensor - proprietary radio
network - has worked precisely for years, but is not sold any more.
after the failure of the microwave sensor experiment, i would like to
get a lorawan diff pressure sensor but they are too expensive -
alternative is another ultrasound sensor
*⊣GE⊢*
On 11 Nov 2023, at 12:04 pm, Greg Hall wrote:
And yes, the advice that stream gauges tell a fuller story is well
taken. We're also evaluating ultrasonic and microwave sensors for this.
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