[Lab] [Bulk] Re: ESP8266 Issues
chris at dreaming.org
chris at dreaming.org
Tue Nov 25 17:31:49 EST 2014
Maybe a variable resistor (float arm or solid state) would allow for
measurement with lower power requirements than ultrasonic, and perhaps
with more accuracy.
There are also MPPT charging solutions that help squeeze the most out of solar.
Note these examples are rather spendy but could be DIY'd for less.
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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