From 807566b869ca840b7e5614509e3bbfb0460f0ea3 Mon Sep 17 00:00:00 2001
From: Herschdorfer <herschdorfer@gmail.com>
Date: Sun, 18 Feb 2018 18:48:48 +0100
Subject: [PATCH] added some information about the hardware

---
 Sonoff-T1-UK-and-T1-EU.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Sonoff-T1-UK-and-T1-EU.md b/Sonoff-T1-UK-and-T1-EU.md
index a7e16acd..eacb38b8 100644
--- a/Sonoff-T1-UK-and-T1-EU.md
+++ b/Sonoff-T1-UK-and-T1-EU.md
@@ -88,6 +88,8 @@ rf cal sector: 251
 rf[112]▒ector: 251@ 10008Mbit(512KB+512KB) mode:(3,7)
 ```
 
+The board is normally powered by the relay board with 5V. When 3.3 volts get applied to the board over J1 or J3 the AMS1117 "leaks" ~2.7V reverse to the LEDs of the touch buttons. This causes them to dimm.
+
 ## Flashing
 
 The following board layouts are from the 3 variants of the Sonoff T1 UK variant and are marked Sonoff T1 R2 UK Touch Board, Ver 1.0. These are the currently supplied versions shipping with firmware version 1.6.2.