ESP8266 Community Forum

- Fri Nov 23, 2018 11:01 am #79244 What would prevent the ESP8266 from starting when a 1K mosfet resistor or any minute load is connected to GPIO-02? On the serial monitor garbage displays.

With nothing connected to GPIO-02 startup is perfect.
I have built projects using ESP8266 outputs for LEDs in the past on GPIO-02 with no problems..

So once my esp8266 starts I can connect the output to GPIO-02 and operates as expected.

This is the project I'm testing: [url]
​https://www.instructables.com/id/ESP8266-Internet-Alarm/[/url]

- Fri Nov 23, 2018 11:33 am #79245 It's considered best practice to pull GPIO2 high at boot or an ESP8266 might not boot properly.

Notes :- GPIO2 It is considered safer to pull it high with a resistor on boot rather than leave it floating to avoid possible chip damage if pin is pulled high by your program but also see http://www.esp8266.com/viewtopic.php?f= ... 524#p22524. GPIO1 (UART TX) also has an effect on boot if pulled low; it will not boot in this case.

Assumption is the mother of all f*ckups. At least: that's what I'm assuming.

- Fri Nov 23, 2018 11:50 am #79247 Thanks QuickFix.
That solved it.
I suppose all of my projects thus far have had pullups, with outputs going low.