From 0fec6a2dd9bb6b219aa7744f87199252bd579498 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?King=20K=C3=A9vin?= <kingkevin@cuvoodoo.info>
Date: Sat, 21 Jan 2017 20:57:29 +0100
Subject: [PATCH] document RTC and periodic query

---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index 7b0b247..aba8ef4 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,12 @@ Connections LED (cathode) <-> board (all LED anodes are connected to the +3.3V r
 - query; PA6
 - submit; PA7
 
+RTC
+---
+
+The onboard Real Time Clock (RTC) is used to track the uptime a periodically start querying all electricity meter for their measurement value.
+The time interval between the periodic queries is hard coded in `main.c`.
+
 ESP8266
 -------