These spots might come in handy as status indicators and tiny mode control buttons:
The montage is 800% of the actual 8×8 pixel size that’s appropriate for the Adafruit TFT LCD.
They’re generated from the standard colors, with the “black” patch being a dark gray so it doesn’t vanish:
# create resistor-coded color spots # Ed Nisley - KE4ZNU # January 2015 SZ=8x8 convert -size $SZ canvas:gray10 -type truecolor Res0.bmp convert -size $SZ canvas:brown -type truecolor Res1.bmp convert -size $SZ canvas:red -type truecolor Res2.bmp convert -size $SZ canvas:orange -type truecolor Res3.bmp convert -size $SZ canvas:yellow -type truecolor Res4.bmp convert -size $SZ canvas:green -type truecolor Res5.bmp convert -size $SZ canvas:blue -type truecolor Res6.bmp convert -size $SZ canvas:purple -type truecolor Res7.bmp convert -size $SZ canvas:gray80 -type truecolor Res8.bmp convert -size $SZ canvas:white -type truecolor Res9.bmp montage Res*bmp -tile 5x -geometry +2+2 -resize 800% Res.png
For a pure indicator, it’d be easier to slap a spot on the screen with the Adafruit GFX library’s fillRect() function. If you’re setting up a generic button handler, then button bitmap images make more sense.
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[…] The LCD screen looks just like that; I blew out the contrast on the surroundings to provide some context. The green square on the left is the Arduino Mega’s power LED, the purple dot on the right is the heartbeat spot. […]