Voltmeters are cheap, and have a great industrial aesthetic about them. This makes them prime candidates for hackers looking to do a clock build. [Brett Oliver] went down this very road, and built a very stylish timepiece along the way.
Voltmeter Clock Looks Great On Display
Would be badass to do the whole clock entirely analog, with an Op-Amp as voltage stair generator for each of the 3 voltmeters. Could use this voltage stairs generator (explained by w2aew): =Kqb5zcrgv7s
This clock tells the time - hours, mins, and seconds using 3 analogue voltmeters. A PIC16F628A microcontroller is used to display the time by varying the voltage to each voltmeter and also provides very basic timekeeping. The Microcontroller code is written in Picbasic Pro 3.
I wanted to use 7.2 x 7.2 (2.8" x 2.8") square 240 display panel meters (pic 3 right) as these displays give a far greater separation between digits but these were very expensive. You may be able to pick up cheap 2nd hand meters from Ebay. Instead I used far cheaper 7.2 x 7.2 (2.8" x 2.8") square 90 display panel meters (pic 3 left) new from Ebay Hong Kong. You can of course use any panel meter you like including horizontal or vertical mounting edgewise panel meters (pic 4). Pic 5 shows the original meter on the left and meters with modified dials on the right.
I am replacing all the commercial time-keepers with Arduino-based devices, usually with some type of real time clock (again, not great accuracy in my experience) and at 00:00:00, the RTC has it's seconds, usually good enough, reset to zero. The Arduino clock might be good enough, but the RTC takes care of time, date, daylight saving etc.
Very nice unit with good function, good looks, easy to use and easy to install. I replaced an analog clock with this digital clock, timer, g-meter and am very pleased. Current draw is extremely low so no concern about battery drain over long periods of inactivity.
We replaced the old inop. Cessna clocks in three of our planes with this. It is listed as a G Meter but it does so much more and it is more than $300 less expensive than a new Cessna clock. Seems to work great so far, long term reliability is to-be-determined.
Excellent replacement for my Cessna 172M quartz clock. Volt meter is a nice feature to monitor the alternator output. I would certainly recommend this clock to anyone having clock issues.A straight forward install just a couple of additional wires to add for the voltmeter and back lighting.
Love it! Its nice to have a no-nonsense voltmeter/clock/flight-timer permanently and legally installed in the panel. With a generator instead of an alternator, its especially important to monitor voltage. My cigarette plug voltmeter looked cheesy. I also wanted a better clock/timer. This listing is sort of buried here on Spruce, but I heard about it on a flying forum and tracked it down. Install was easy and it looks great now that its in there. Works perfectly, too.
Its a floor wax! Its a dessert topping! It's an all-in-one benchtop multimeter that's also a bluetooth speaker, alarm clock and thermometer. It can run off of USB power (plug into any wall adapter for charging your phone or gadgetry) and has built it rechargeable battery port for portable use. Perfect for use on your workbench, coffee table, or Thanksgiving centerpiece -- its a great conversation starter!
We couldn't resist stocking this "its so uncool its flipped around and become cool again" engineer's toolkit. Why stop at one feature when you can keep adding more, this solidly-built desktop multimeter has everything but the kitchen sink included. Easy to use and has a big honkin' digital display, packed with all the bonus extras you never knew you wanted until now, including a Bluetooth speaker, alarm clock, and indoor thermometer. It's even got built-in rechargeable battery sockets so you can use it on the beach, at a jazz cafe, in the middle of an outdoor wedding, or when the power is out due to a zombie infestation that has destroyed most of civilization.
Specifying "display counts" is another way to specify the resolution. Display counts give the largest number, or the largest number plus one (so the count number looks nicer) the multimeter's display can show, ignoring a decimal separator. For example, a 5 digit multimeter can also be specified as a 199999 display count or 200000 display count multimeter. Often the display count is just called the count in multimeter specifications.
The low hanging fruit of power saving is to keep the CPU in sleep mode as much as possible. The ATtiny has the ability to run timer registers in hardware while the CPU is off. Taking advantage of this, one set of registers is actually able to generate PWM signals to drive the clock display meters while the CPU is sleeping! The other timer register generates interrupts to wake the CPU every second to run the logic that counts the time and adjusts the displays. Then the CPU goes back to sleep until the next interrupt. 2ff7e9595c
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