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vault backup: 2026-06-26 18:23:23

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@@ -43,4 +43,7 @@ Initially I was planning to use the [NHD-2.4-240320DA-CTXN](https://www.digikey.
The display controller gives the option of using SPI or parallel RGB to control the display. I decided to go with SPI since it is much simpler to route and manage and I don't need the performance gained by the parallel RGB interface. The display controller gives the option of using SPI or parallel RGB to control the display. I decided to go with SPI since it is much simpler to route and manage and I don't need the performance gained by the parallel RGB interface.
### Backlight Resistors ### Backlight Resistors
To limit the current of the backlight for the display seri To limit the current of the backlight for the display series resistors are needed for the anode (power supply) pins. To calculate the value for the resistor the equation
$$R = \frac{{V_{in} - V_{f}}}{I_{f}}$$
is used which gives the current limiting resistor needed for a LED. The display used has a LED voltage of 3.0V and will be supplied with 3.3V. It also typically draws 160 mA of current. Plugging in these values gives
$$R = \frac{{3.3 - 3.0}}{0.16} = 1.875 \Omega$$