By Alun Williams 21st October 2014
Here’s a great project – a Gadget Master at work with the RIoTboard, the low cost single board computer that’s capable of running Android or Linux.
“Shabaz” shows how to connect up your own TFT LCD display (1024 x 768), complete with Digitizer.
In illustrated steps he connects the RIoTboard up to a Thin Film Transistor (TFT) LCD display, covers such things as the RIoTboard LVDS interface, board pin outs and selecting an In-Plane Switching panel, and solders the display to the breakout board…
The circuit at the heart of the system manages two power supplies: one to drive the panel, and another for the backlight (the two voltages will vary depending on the panel chosen). He writes:
The circuit for the two power supplies is shown below. The DC-DC converter U1 is used to generate a 3.3V supply to drive the LCD panel. U4 is used to step-up from 5V input up to 15V to drive the CCFL inverter which generates >600V. Different voltages can be set as can be seen in the table in the circuit diagram below (it depends on what input voltage the inverter requires), and the diagram shows the voltage set to 6V. In order to set to 15V, R12 should be 68 ohms, and R13 is not fitted.
The circuit has lots of ‘do not fit’ resistor locations that can be experimented with if it is desired to run the entire circuit and the RIoTboard from a single supply source.
Shabaz acknowledges that there are pre-built displays you could use with for the RIoTboard, but a “build-it-yourself” approach is more in the spirit of Gadget Master!
There are loads of details, step by step guides, lots of pics, the full circuit diagram, a parts list with order codes and plot (Gerber) files for the PCB…
There are actually two parts, to fit in the details. Check it out:
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Homemade electronic gadgets, the latest dev boards, and the more interesting consumer devices. Written by Alun Williams.
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