From c24d97f4db7911145424fecacfe176f9112e53c1 Mon Sep 17 00:00:00 2001 From: ben-jaynes <1btjaynes@gmail.com> Date: Fri, 26 Jun 2026 21:49:55 -0700 Subject: [PATCH] vault backup: 2026-06-26 21:49:55 --- PCB Design/Music Player/Process.md | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/PCB Design/Music Player/Process.md b/PCB Design/Music Player/Process.md index 42f7649..aa6624b 100644 --- a/PCB Design/Music Player/Process.md +++ b/PCB Design/Music Player/Process.md @@ -49,4 +49,5 @@ is used which gives the current limiting resistor needed for a LED. The display $$R = \frac{{3.3 - 3.0}}{0.16} = 1.875 \Omega$$ For a standard value a $2.0 \Omega$ resistor will be used. This may make the display a little bit less bright but won't change it very much.Vs - Vf) / If using the maximum forward voltage: ### Backlight Control -Since this device will be battery-powered and the display is not needed most of the time it needs to be able to be controlled by software by the ESP32-S3. To do this a transistor will be added to the cathode pins to control the backlight with an io pin from the microcontroller. \ No newline at end of file +Since this device will be battery-powered and the display is not needed most of the time it needs to be able to be controlled by software by the ESP32-S3. To do this a transistor will be added to the cathode pins to control the backlight with an io pin from the microcontroller. +I chose [this mosfet](https://www.digikey.com/en/products/detail/infineon-technologies/IRLML2502TRPBF/811439) since it has very low resistance \ No newline at end of file