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The current world population is 8,082,007,476 as of Sunday, December 31, 2023 according to the most recent United Nations estimates [1] elaborated by Worldometer. The term "World Population" refers to the human population (the total number of humans currently living) of the world.

I read your blog regarding clocking a gas meter and I thought you might need to add a caveat because your formula will only apply to a 1/2 psi gas meters or lower. In the Vancouver region, were I live, it is common to have 2 psi gas meters on single family homes.

Download Clock Meter

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The Original The Water Meter Clock made at Derby Pottery since the year 2000, is an exact copy of the iron meter cover in the city sidewalks of New Orleans. An iconic image of our city, cherished by locals and visitors alike.

The CM-170 SPL Meter has Data Logging with a Clock feature, Fast/Slow Time Weighting, and Electronic Calibration. The CM-170 is an affordable IEC 61672-1 Class 2 and ANSI S1.4 Type 2 rated sound pressure level meter that competes with some of the best audio level meters on the market. The Galaxy Audio CM-170 comes complete with a carry case, windscreen, USB cable, and Windows software for computers.

The CHECK MATES line of SPL (Sound Pressure Level) meters are affordable quality audio level meters that everybody working in loud environments should own. The CHECK MATE series SPL meters, allow musicians, sound contractors, and others to measure sound pressure levels in decibels (dB). A decibel is defined as the unit for measuring the relative loudness of a sound.

Over time, all SPL meters lose their calibration. The Galaxy Audio CM-C200 is a sound pressure level (SPL) meter calibrator. The CM-C200 meets IEC 60942 2003 Class 2 and ANSI S1.40-1984 standards. The CM-C200 can calibrate 1", 1/2", and 1/4" diameter microphone capsules at 94dB and 114dB.

It's actually a pretty simple circuit. The clock is based on an AtmelAT89C2051 microcontroller. The software in the microcontroller handles thecount for the time. It "talks" to a 4 channel Digital to Analog converterto derive the voltage to position the needles on the three meters. Theoutputs of the D2A converters are buffered with a quad amp. Otherwise thecurrent draw of the 1ma meters would exceed the D2A converter. A DallasDS1307 generates an accurate 1hz timing signal and also backs up the timesetting in the case of a power failure.It's very cool to watch the seconds meter raise as a minute progresses andthem fall to zero again. The clock runs in a 24 hour mode. This photo does not show the meters with the updated scales that willreflect the time digits and not the original DB scale.

Here is the clock built on a circuit board.

Photo showing the enclosure I bought for the meter clock and themeter mount. (The enclosure is a pencil box bought from an office supply store.)

A view from the front of the clock. The meter scales have been updtedfor time display.

Another way I packaged the meter clock

Trinket lends itself very well to building clock projects, its small and easy to hide behind a larger display. And clocks don't need a lot of logic, this example only has maybe 20 lines of code. Adding a digital display via I2C is possible using seven segment or character-based displays (with the library code posted for other projects).

This project interfaces Trinket to the the Adafruit DS1307 real-time clock (RTC) breakout board to form a clock. But rather than use the traditional digital display, the display is done using two analog meters. One for hours, one for minutes.

The Trinket can output to a meter without digital to analog converters. Trinket has pulse width modulation (PWM) on three of its pins. The meter uses a moving coil inductance movement, acting to average the indication of current flowing through it. If you have narrow pulses, the average voltage it sees is lower, thus the current is lower for the fixed resistance attached to it. For wide pulses, the meter sees nearly the supply voltage and will stay around the full scale. This circuit varies the pulse width sent to the meters proportional to the hour of the day and the minutes after the hour.

For two meters, we will use two of the three PWM pins on Trinket (the third is also an I2C pin connected to the clock module).

There are several projects on the web using analog meters to tell time. The ease at which you can do this with Trinket allows you to build this type of clock quickly and compactly. You may focus on designing how to mount the meters in a creative way.

There are many ways to display the finished project. Rather than a cabinet or plexiglass display, I chose meters free-floating in a colorful box. I think it lends a modern look.

The case is made from laser cut .118 Acrylic. We used a clear acrylic because it plays with the light and the clear covers of the meters in a way we love! It also lends itself well to being used with lighting. As a fun variation you could also include some RGB leds into the chassis and use the PWM pins on the Arduino to make the chassis really pop! We will add this chassis to ponoko for anyone that wants one.

Next you will need a real time clock module. These are great little gadgets and once set with the correct time they will run and run with their onboard battery. I personally like the model at adafruit, and for 9.00 its a good deal. Check out the adafruit wiring article for more info!

Next on our build list will be the meters there self. Just about any 5V panel meter will work just fine but if you can match the model we have pictured here it seems to be more responsive than other models we tried. Ebay is the best source we found so take a look around and see what you like.

Hi, thanks for share this nice project, and will build a panel clock

I am new with Arduino, is it possible to share some drawings

from the connected wires between the Arduino and the panel meters.

This step is completely optional, but I decided to put some lighting inside my meters.

First, I took the covers off the meters and drilled two small holes for the LEDs. Then I simply hot glued the LEDs into place. Be careful when drilling and hot gluing because the inside of the meters are relatively fragile.

It is better to use diffused LEDs for this application, but I did not have any diffused white LEDs around. So, I diffused some clear LEDs by using some sandpaper.

Don't forget resistors!

The programming for this is relatively simple, but the hardest part is getting your meters to display time accurately. For example, when it is 6:30 both meters should be pointing straight up. Because all meters are slightly different, the PWM values need to be adjusted based on your design. Feel free to use my code, but you will have to change some values because it is set to work specifically with my meters

To program the Arduino Pro I used my Arduino Duemilanove because I don't have a FTDI programmer. Just remember that if you use your Arduino, you have to remove the Atmega chip before you program a separate device.

The code is not perfect, but it works. I don't have a whole lot of programming knowledge, so let me know how I can improve it.

If you only want to use it as a clock, download the ClockONLY code.

I decided to make the enclosure with only two pieces of wood. I drilled out the holes for the meters, painted the base, and screwed on a thin piece of wood which I covered in a thick felt material. I chose this design because it was easy to build and allows easy access to all of the electronics.

Because these meters have to display time, I had to customize the backgrounds. I scanned the back plate of the meters and used MS Paint to create a custom background. Then I printed the design on card stock paper screwed it in place. You can download the designs that I have attached below if you have the same or similar meters.

Hi! i seem to have a few problems with my meter. currently im just using 1 meter. its an 100ma (using the decent resistor)

But when i plug it in and run the code, it goes instant to 100. then to 80 and then back to 100. im tinkering for a few hours now but i cant seem to find a solution.

Is it that the meter is like stuck when not plugged? this might be of the magnetic field still "on" but i might be wrong. I just hit it a few times on the table and it seems to get back down. lol, might also not be the wisest thing to do but it helps i gues

awesome project :) I could manage to get the clock working, however, no way of reading the sound from an audio jack...I looked everywhere on other websites/forum/guides etc, no way of catching the ouput from an audio jack, sending it to the arduino, reading it with analogRead and doing something with it...any hints ?

For a real time clock (RTC) CLOU energy meters are operating with an external quartz crystal with a frequency of 32.768 kHz. Together with electronic compensation for accuracy and temperature change, we are better than the by IEC 62054-21 required values for time switches.

Our square Water Meter clock can be ordered in any 2 of our 16 colors. Please note that the darker colors work better than the lighter colors. It is the contrasting juxtaposition of light letters against dark backgrounds that allow the image to be seen more easily.

Yours will just have been set at a different time of the year. They have no facility to change and are permanently set. If they get too far out of time or start changing randomly then a new meter clock will be required.

Good luck! I know how you feel, but you'll get nowhere. I'll bet you're on "Economy 7", which means that you get 7 hours of low-rate between the hours of 11:30 and 08:00, not necessarily from 11:30 to 08:00. That allows for the clock being a bit out, and gives it some leeway. 2351a5e196