Super µController LED Display Modification

After some field testing, we find it is advantageous to slightly modify the control panel for the 8-digit LED displays. The panel was manufactured to tight tolerances and it appears that the thickness of the panel may obstruct the viewing of some of the LED displays. In particular, the bottom of the 8-digit display gets cut off when viewed from an angle, hence losing the important decimal point.

To alleviate this issue, we are milling out .06" around the periphery of the LED displays. This provides clearance for visibility.

Caution: there are some mounting stubs on the back of the panel that are within this distance from the current LED cutouts, so on these sides, one cannot mill the full amount.

In addition, we found that the glare from room lights can make the LEDs difficult to see. To combat this, we are installing deep red gel filters. This provides great contrast and alleviates this problem.

Finally, if the LEDs need to be brightened, a second resistor network may be mounted on top of the orginals, providing a parallel connection and doubling the current to the LEDs. A 470 ohm resistor network was used originally so that the LEDs wouldn't be too bright in the lab.

View of the Milled Displays

	The 8-digit display after milling around for added visibility. Note in this case, .06" were milled from the bottom and .04" from the left. This leads to an asymmetrical look, therefore we suggest milling the top and right sides as well
	Likewise for milling around the other displays.

Mounting directions for Resistor Networks

	Close-up of the current setting resistor for the 8-digit display. (on the small panel) Shows the second resistor network being installed on top of the original network. Carefully align the pins then press down firmly.
	The properly fitted resistors. Now solder the overlapping legs together.
	Follow the same procedure for the resistor associated with the other LED displays (on the big panel)