ESP8266 Community Forum

- Tue Jul 14, 2015 7:57 pm #23283 I am not exactly a newbie to the esp8266. I have had it for a long time and successfully did things like cloud updates, wifi tie into to spark fun phant,etc.

I recently dusted one off and excited to use arduino die 1.6.5 to natively flash blink to it. I got it to work right off the bat. However, the flash doesn't restart the blink sketch. That is after power loss and repowering.

I can reset and reload the flash and blink works. But never restarts.

Can you help me debug?

- Tue Jul 14, 2015 8:09 pm #23284 You betcha we will try and help. Can you post some pictures of your breadboard setup as well as descriptions of your circuit configurations?

Free ESP8266 book available for download here.

- Tue Jul 14, 2015 8:25 pm #23285 Sketch is Standard Blink with Pin 2

Code: Select all#define LED 2
// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin 13 as an output.
  pinMode(LED, OUTPUT);
  Serial.begin(115200);
}

// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);              // wait for a second
  Serial.println("LOOP");
  digitalWrite(LED, LOW);    // turn the LED off by making the voltage LOW
  delay(100);              // wait for a second
}

I am using Arduino 1.6.5

using Manager URL = http://arduino.esp8266.com/package_esp8 ... index.json

Install Board Manager ESP6288

----

Sketch uses 203,120 bytes (38%) of program storage space. Maximum is 524,288 bytes.
Uploading 31760 bytes from /var/folders/ng/mxyvxczs5t96qsp0wy47m8l80000gn/T/build6647629209626918089.tmp/sketch_jul14b.cpp_00000.bin to flash at 0x00000000
................................
Uploading 171400 bytes from /var/folders/ng/mxyvxczs5t96qsp0wy47m8l80000gn/T/build6647629209626918089.tmp/sketch_jul14b.cpp_10000.bin to flash at 0x00010000
........................................................................................................................................................................

Flash completes and Blink on GPIO2 is running.

VCC, GND connected
RX,TX connected (obvious)
GPIO2 (LED pin 2) to LED
VCC -> CP_PD (I undo this each time I flash, otherwise receive error)
GND -> GPIO_0 (I assume this again is required for Flashing if i remember correctly.
No connection -> RST

I would sent a picture, but i use similar colors on the pins.

Should I remove or take GPIO_0 to High and RST -> GND to restart it?

- Tue Jul 14, 2015 8:29 pm #23286 Ok, well after I wrote it, I guessed the answer.

I need to take GPIO0 to HIGH to avoid re-flash after power loss.



Blink works now after power loss, if I disconnect GPIO0 or take it high Which is something I recalled from before.

Can you confirm?

(can this be marked answered?)