diff --git a/Orange-Pi-GPIO-pins.md b/Orange-Pi-GPIO-pins.md
index c5f07ba..4809c57 100644
--- a/Orange-Pi-GPIO-pins.md
+++ b/Orange-Pi-GPIO-pins.md
@@ -39,3 +39,21 @@ http://www.orangepi.org/Docs/Pindefinition.html
 
 USB GPIO on Orange Pi One is difficult, need someone with awesome solder skills: https://forum.armbian.com/topic/755-orange-pi-one-adding-usb-analog-audio-out-tv-out-mic-and-ir-receiver/
 http://linux-sunxi.org/images/7/7e/ORANGE_PI-ONE-V1_1.pdf
+
+
+Orange Pi GPIO - Interfacing
+
+https://forum.armbian.com/topic/4940-how-to-turn-onoff-orangepi-pc-from-button-on-gpio/
+
+  https://github.com/duxingkei33/orangepi_PC_gpio_pyH3
+
+  https://gist.github.com/BiTinerary/2734ac46e80af2b1a2158c9f0ba79e25
+
+https://diyprojects.io/orange-pi-onelite-tutorial-use-gpio-python-pinouts/
+
+Adjust device default LEDs.
+
+
+Raspi example of LED lighting:
+
+https://thepihut.com/blogs/raspberry-pi-tutorials/27968772-turning-on-an-led-with-your-raspberry-pis-gpio-pins