From 3645640daeb33773bd2b3495e47df2ad34e9266f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Henrik=20Alse=CC=81r?= <henrik.alser@me.com> Date: Mon, 18 Jan 2021 00:06:46 +0100 Subject: [PATCH] Cleanup --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 4a48450..bdc8470 100644 --- a/README.md +++ b/README.md @@ -161,7 +161,7 @@ Now add a reset button. Suitable value for capacitor is found in the MCU data sh In order to see that your system is correctly powered, it is recommended to add test points for easy probing, in the form of exposed pads on the board. It is recommended to use a pin header footprint for GND test points so you can easily clip the scope probe's GND alligator clip to it. Place at least one GND clip for each subcircuit block on your boards. You don't need to stuff them with pins by default during assembly, but it is nice to have the option to add those in when troubleshooting. -It is also recommended you add LEDs to your power rails so you can see they're powered up correctly. You can use an LED such as [this red one](https://www.elfa.se/en/smd-led-645nm-0805-65cd-30ma-kingbright-kptd-2012surck/p/30118951), together with a suitable current limiting resistor. Aim for a forward current of about 2mA. You can use this [LED calculator](https://ohmslawcalculator.com/led-resistor-calculator) to calculate suitable resistor values for your LEDs. Use resistor values from the E12 series. +It is also recommended you add LEDs to your power rails so you can see they're powered up correctly. You can use an LED such as [this red one](https://www.elfa.se/en/smd-led-645nm-0805-65cd-30ma-kingbright-kptd-2012surck/p/30118951), together with a suitable current limiting resistor. The forward voltage drop of a red LED is around 1.8V, aim for a forward current of about 2mA. You can use this [LED calculator](https://ohmslawcalculator.com/led-resistor-calculator) to calculate suitable resistor values for your LEDs. Use resistor values from the E12 series. ### 14) SPI -- GitLab