The EDS803 LCD is a 3 1/2 digit segment LCD. Its applications are used in many digital volt meters, DVM. The example DVM chip is ICL7106. The ICL7106 chip has a driving port that connects to the LCD segment directly. The advantage of the LCD segment is nearly zero power consumption. This makes the segment LCDs are still being used in battery power devices. So it is a good idea to use this LCD for other applications as well. To make it more simple use, the HT1621 chip is very suitable for driving the LCD. Interfacing to the host will need only three signals; CS, WR and DATA, and power supply +5V, GND pins. The circuit that interfaces the ED803 LCD with HT1621 is shown below.
The sample code, Arduino based IDE can be downloaded here, LCD312.rar
Example of sample code running, display full segments, numbers and sign. The LOBAT sign is very nice for battery power devices.
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Schematic, sample code LCD312.rar
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Last updated, October 2024