[Lab] [Bulk] Re: [Bulk] Re: ESP8266 Issues
klmckinnon at rogers.com
Tue Nov 25 17:45:45 EST 2014
Good point on the power limits with US sensors, however it would only
need to be triggered a few times a day, so stay in sleep mode for most
of the time, trigger a few times to average, log and snooze.
Or you could use one of these
IR range sensor, good for about 1.5 m at just a small amount of current
(think about 20 ma in operation). Although the Adrian didn't indicate
the range he was expecting to cover....
On 2014-11-25 5:31 PM, chris at dreaming.org wrote:
> Maybe a variable resistor (float arm or solid state) would allow for
> measurement with lower power requirements than ultrasonic, and perhaps
> with more accuracy.
> e.g. https://www.sparkfun.com/products/10221
> There are also MPPT charging solutions that help squeeze the most out of solar.
> e.g. https://www.sparkfun.com/products/12885
> Note these examples are rather spendy but could be DIY'd for less.
> - Chris
> On 25 November 2014 at 17:20, Ken McKinnon <klmckinnon at rogers.com> wrote:
>> I had thought about doing this a few years ago for ground water height (but
>> long before really low power stuff and decent solar cells) - and power was
>> the problem that shelved it. Your idea is very close to what I was going to
>> do. I never got as far as testing, but am curious as to what the sonar
>> bouncing off the walls of the pipe would do. The other difference is I was
>> going to use a ping pong ball to make sure it would be oriented right
>> without sticking to anything.
>> I would be interested on how it works out for you.
>> On 2014-11-25 2:49 PM, Adrian Jones wrote:
>>> Hello all,
>>> Thanks for your suggestions.
>>> Turns out that the baud-rate is 9600 for newer units and at this rate, and
>>> with a stable 3.3v power supply (this little puppy sucks power!), was able
>>> to connect it to my WiFi.
>>> I am toying with the idea of making a data logger to measure the
>>> fluctuations of the water level of our lake. As a dammed river, the water
>>> level fluctuates depending on the amount of water in the Rivière Blanche
>>> watershed. I'm thinking that the design will have an ultrasonic
>>> at the top of a length of ABS pipe that is partially submerged in the
>>> A disc of plastic inside the pipe floats on the surface of the water and
>>> provides a large surface area to rebound the transducer's ping. As the
>>> level rises, so too does the float and the ping echo is made shorter. I
>>> to add a small solar cell and set of rechargeable batteries and an RTC to
>>> wake the software up every few minutes. The software will take a number of
>>> readings which, when averaged, will be sent over the WiFi connection to an
>>> online data logger. Interesting?
>>> ... Adrian
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