The evolution sometimes shows, that not everything “new” is automatically better than something „well-proven“. One of examples was also a „boom“ of digital panel meters, when it seemed for a while, that the life of analog panel meters is coming to an end. However it showed very soon, that an analog display has a huge advantage in a very fast legibility - i.e. already a brief look at a meter is enough to realize the position of a needle of a meter. Naturally, accuracy of reading of value from an analog meter is lower, than that of a digital (7-sgment) display. mainly at the beginning of a range, but this doesn´t matter in many cases and a certainty of a fast check, whether for example a given variable is in normal is often much more important.
Fortunately, classic electromechanical panel meter can be replaced by graphic displays thus obtaining a free hand at design of your own panel meter. At the same time, the combination of an analog and a digital meter can be created this way. Perhaps the best “replacement” for analog meters is a round display, which has a minimum space requirement in a target device. Novelty in this segment is the uLCD220RD (round) display module with a circle active surface (circle 220 px, 1,38“). Despite the fact, that it´s a small size display, it´s driven by the most powerful processor from 4D Systems - Diablo 16, which gives it a big versatility of usage, many interfaces and GPIO pins.
New version of a well known SW package for development of graphic applications - 4D Workshop IDE from 4D Systems already supports this new module even in the Visi Genie environment, enabling a „drag&drop“ development of application.
In praxis a 220 px circle is able to display a considerable amount of information. On attached pictures we bring you a small demonstration of uLCD220RD module imaging.
round TFT LCD module with a powerful 16 bit graphic processor
1,38“/ circle with a 220px diameter
32kB user RAM, 16 GPIO pins, 4x analog IN
various configurable interfaces - PWM, I2C, SPI,...
connector for uSD/SDHC cards, FAT16 file system
Workshop4 IDE SW package for free
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Gain the uLCD220RD module for free!
Competition with the following question has been published here:
How many colors can be displayed by the uLCD220RD module?
The correct answer was: 65k, RGB, true to life
We have drawn the following winners:
Miroslav Slováček [CZ]
Congratulations to winners. We´ll inform them by e-mail.
Date of publishing 08/22/2014. When you issue article on your website, please give its source: https://www.soselectronic.com/en/articles/4d-systems/4d-systems-round-panel-meter-by-means-of-a-display-1577
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