From eab45ab807d883169247d88fc583f998b4e04d47 Mon Sep 17 00:00:00 2001 From: Michael Miller Date: Sun, 18 Dec 2016 12:07:39 -0800 Subject: [PATCH] Updated FAQ #10 (markdown) --- FAQ-#10.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/FAQ-#10.md b/FAQ-#10.md index 682068c..cceeba3 100644 --- a/FAQ-#10.md +++ b/FAQ-#10.md @@ -1,7 +1,10 @@ ### On my ESP8266 when I flash the sketch the LEDs light up, is this normal? Yes it is normal for both DMA and UART to have this side effect. + The UART is used to program the ESP, both DMA and UART are using the low level hardware that is also used for serial/uploads; so this can happen. They are reacting to the serial data being sent across the wire and get fooled into thinking its something when its just code being flashed. +This can be a problem in your design if you normally only plan to power a subset of LEDs or never set them to a high brightness. Thus you may only provide a 5v power with enough amperage for half the strip maximum possible power draw. + Since the LEDs need 5v, when I prototype I usually run a switch that I can turn them off when I upload; and the final project just doesn't get flashed. NOTE: OTA (over the air) flashing should not cause this.