ESP8266 Community Forum

Hi, I'm new here and to the platform.

I purchased this dev board so I could code "on the go".

I've flashed various firmwares to the system, and I have been having a lot of trouble.

When it boots, at 115k baud I get:



If I switch over to 9600 baud, I get this:



Then, sometimes, if I'm holding the board in my hand and it is not on the table, I get this:



I am able to send a few commands, like node.heap(), and then it resets again, typically after about 2 commands (or 2 seconds, whichever comes first).

My question is...

Am I having a power deficiency issue here? I may hack in a 'dual usb' cable for power and see if that helps.

I find it strange that the system boots if I hold it in my hand. That seems like a grounding issue or floating reset pin. I can't manage to find the documentation on running the bare minimum on this board, am I omitting something silly like pulling the reset pin low or something?

I know there is a basic wiring setup that is needed, but I assumed the NodeMCU dev board would handle these bare minimum pin connections onboard.

Thank you.

I have the same issue. The EPS-12 keeps resetting. I'm assuming it's a lack of power or anything else. I use a modified powerbank as power source. Added a 3.3v regulator and a capacitor to try to keep the output at steady as possible.

I just came accross the following (blog)post http://internetofhomethings.com/homethings/?p=396

The post contains a list of items you can check that can result in resets. As I assumed, the powersource is one item on his list. It also contains some solutions about adding some extra capacitors between VCC and ground. I've not really tried this point, only in my powerbank.

It also states that the ESP8266 is not really friendly with a breadboard. That's what I'm going to try, remove the ESP12 from the breadboard and connect directly.

Thanks for the link, it has some really good suggestions to try. It sounds like a pretty common problem.

I'll report back if power ends up being the issue.... That would be disappointing since the board seems like it should be set up properly to run off USB, but I guess it could be my computer not supplying the proper current. I'll try putting a big cap on there as well to see if a current spike is causing a brownout.

Heya,

I have also NodeMCU 0.9 dev board and yes it needs stable USB power, at least 4.6V, mine worked all the way down to 4.4V but below that it's very flaky ..
Connected to good selfpowered USB hub I've never had any problems with this board (that includes driving TFT and 4 I2C).

--
Mozz