Led Matrix Display Internals – LPC1788 CPU, isolated RS485 ports, Isolated Power Supply, Led Matrix Buffers, USB Host
Led Matrix Display – Internals
Tag Archives: LPC1788
Led Matrix Display – Installed
I121 Led Panel Matric Display – Installed on a Road Pavement Grinding Machine
I121 Led Matrix Display – Installed on a Road Pavement Grinder
In this case the display LPC1788 microcontroller (Haoyu HY-LPC1788-Core) is running MODBUS master firmware, and there are two PT100 modbus modules in a separate enclosure.
New PCB for the LED Matrix Display
This is the PCB for the new Led Matrix Enclosure 
Isolated Power Supply, 2 Isolated RS485 ports, Micro SD Card slot, USB Host, Ambient Light interface, and buffers for the LED Matrix.
Uses a Haoyu LPC1788 module (NXP ARM Cortex M3 with more memory than you can poke a stick at).
We will design a version with Ethernet later this year.
New Display Enclosure – Led Matrix Display
A few views of our new Led Matrix Display Enclosure design
300mm x 180mm x 50mm
The side slides are for simple insertion into and extraction from a mounting cradle.
IP rated connector and ambient light sensor for auto dimming.
From the top –
- Window
- Led Matrix and Supports
- Led Matrix and PCB Mounting Sheet
- PCB
- Enclosure Bottom
Looking inside with the bottom cover removed
Led Matrix Display
I picked up some colour LED modules for daylight readable displays.
From Aliexpress Store Shenzhen LCCL Opto-Electronic Science & Technology Co., Ltd.
Shown below driven by a LPC1768. (The normal commercial application uses FPGA to handle an array of these display to build a large screen)
The displays use a serial -> parallel led drive, data in is 6 bits wide (2 rows clocked in at once, RGB), and uses two 74HC138s to select 2/32 rows. This appears to be a fairly typical arrangement for this type of display. (the smaller displays only clock in a single row, but the principle is the same)
The display shown is a P4 (4mm pitch between pixels), P3 is also readily available.
I intend to enclose this in an IP rated box with a few basic IO and RS485 and CAN ports.
There will be a single screen and a 3 screen version (That would be a LPC1768 for each display) giving a 96 pixel x 64 pixel display.
Please contact me if you would like any further information.