![]() You can do this via the micro controller when its running but if you want to put your micro controller to sleep it will not be able to supply the required Vcom pulse so you will need another solution to provide the Vcom square wave every 60 seconds. These screens require that you refresh Vcom every 1 to. You will be able to run the 4.4 and 2.7 inch screens with the new Spark Photon since it has the larger memory bank. The 4.4 Inch display is 320 x 240 pixels so the resolution is less than the smaller 2.7 inch display which is 400 x 240 but that also makes the required ram requirement smaller. Whats amazing about these LCD’s is that you could run them for a year with only 1 watt hour of energy. The font is called SF Square Head Condensed & Regular. I’m using 's awesome custom font capibable mfGFX library along with a font that looks great at any size due to it having all square corners. Just wanted to share that you can now find suppliers who are stocking the 4.4 Inch Sharp Memory LCD’s. Not the most elegant solution, I admit, but it should work since I don’t plan on putting anymore than 3.3V into the board anyway! I verified the regulator’s output went straight into C5 by looking over the schematic and PCB files that were on GitHub (he built in the board in Diptrace, which I happen to use). Instead of going through all that trouble, I simply wired VIN straight into the capacitor (C5) that VREG output the 3V3 rail into. I just used my hot air gun to remove the dead regulator from the Rengineer board, unfortunately when it blew it got so hot that it actually melted through the pads, so they came up with the regulater, along with the traces they were connected to! This means I’d have to glue a new VREG on upside down and then tap into other pads on the board to make the connections. ![]() Ah well, I can just use the 3V3 output as an input. I originally hooked it up to my MSP430, which only outputs 3.3V and I just verified the power leads were correct from a photo I took, so it must have been either static from handling or over temperature from when I re-soldered the header. Well, the Adafruit board could burn out if it got more than 5V, but if you were connecting it to an Arduino or something I doubt that was the case.
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