1.3.1.3.7 Demo LCD Display
The Demo boards include an LCD customized for a smart metering application field. This LCD is driven directly by the PIC32CXMTx MCU, generating the driving signals for the common lines and the segments. The LCD layout is shown below:
The Demo Meter application periodically updates the display, showing different information cyclically. The user can manually switch the display content by pressing the “Scroll Up” and “Scroll Down” buttons.
The information displayed is managed by the application, and the typical parameters shown are summarized in the following table:
| Info Type | Display Content | Info Type | Display Content |
|---|---|---|---|
| 00 | Display All | 11 | Phase B voltage RMS value |
| 01 | Board information | 12 | Phase C voltage RMS value |
| 02 | Firmware Version | 13 | Phase A current RMS value |
| 03 | Total active energy | 14 | Phase B current RMS value |
| 04 | TOU1 active energy | 15 | Phase C current RMS value |
| 05 | TOU2 active energy | 16 | Total maximum demand |
| 06 | TOU3 active energy | 17 | TOU1 maximum demand |
| 07 | TOU4 active energy | 18 | TOU2 maximum demand |
| 08 | RTC time | 19 | TOU3 maximum demand |
| 09 | RTC date | 20 | TOU4 maximum demand |
| 10 | Phase A voltage RMS value | — | — |
The Demo Meter application switches on all the display elements when the system is powered on. Then, it shows the board information and the firmware version. Finally, the remaining information in the table is cyclically displayed if applicable.
The display includes specific icons for a smart metering application, to make the data visualization easier for the user.