From 962d0495ffa8f6585efb4c2ba0abbbb150c90940 Mon Sep 17 00:00:00 2001
From: Pierre Hubert <pierre.git@communiquons.org>
Date: Sat, 22 Feb 2020 18:30:59 +0000
Subject: [PATCH] Update README

---
 README.md | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 9655323..802b13d 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,13 @@
 # TrainCircuit
 
-Codes for my father train circuit
\ No newline at end of file
+Codes for my father train circuit
+
+
+## Relays control
+The relays boards must first have the following connections:
+* GND (relays board) => GND (raspberry PI card)
+* VCC (relays board) => 5V (raspberry PI card)
+* Each INx on the relays board must be mapped to a GPIO pin of the Raspberry Pi
+
+Use `GPIO.output(num, True)` to stop a relay and `GPIO.output(num, False)` to start it again.
+