Hi everyone! Just started messing with ESP8266 since my boss wanted some temperature readings

Electronics
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Hi everyone!

Just started messing with ESP8266 since my boss wanted some temperature readings from the different offices at my workplace and I thought that a ESP8266 with a temp sensor would be the best solution!
I’ve tried to follow some guides around the interwebs but already running into some problems!

Flashing nodeMCU seems to be working just fine:
Connecting…
Erasing flash…
Took 1.92s to erase flash block
Wrote 413696 bytes at 0x00000000 in 40.3 seconds (82.0 kbit/s)…
Leaving…

But when I try to connect to it with esPlorer I just get a bunch of either squares or ???, see pastebin
http://pastebin.com/NM3fH7Fy

Connections are correct with 3.3V on CH_PD and VCC? read somewhere that I should add 3.3V to Reset to but that doesn’t seem to matter…

Any ideas?

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  1. It seems that you get a wdt reset (“watchdog timer reset”). Your chip might be doing a full reset. Have you tried to connect pin XPD ,GPIO 16 to reset without a cap?
  2. What code are you using?if you have somethin like “while(1)” you should comment it. Someone else had a similar problem (http://www.esp8266.com/viewtopic.php?f=9&t=3146 )
3

Thats the strange thing, I’m not having any program running on it! Just wanted to see if I managed to get it connected to the wifi at work!
This is how it’s connected right now: https://photos.google.com/share/AF1QipNydRyezJMwV3YCXU-YfnHlC2Vwm3nbCpUr_sDKn8jpJv9LuPwK_j5O_5uwN0yTKQ?key=d3RTWGxnVUNrSFdIYjdoMU1Ec3pUUk1kVE9CNldB
Nothing fancy, power to vcc & ch_pd, gnd to gnd, and then tx&rx. (the green unconnected is the earth for GPIO0 when flashing)

The only thing I’ve done is flashed it (esptool.py -p /dev/tty.usbserial write_flash 0x000000 nodemcu-master-8-modules-2016-02-11-12-25-16-float.bin) and after that connected to it with esPlorer…

4

I used to have similar problems with ESP8266-01 at flashing it while powered just from USB-serial adapter in mini notebook. With regular notebook with power USB port I have not had such problems. Try reflashing the module with power supply from your supply adapter on breadboard as illustrated in your picture.

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Will try that, should I connect the gnd and vcc from the USB to the breadboard lines to?

6

I have tried with nodemcu but incomfortable totally. You shoud go with esp8266 arduino or c programming sdk

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I have tried with nodemcu but incomfortable totally. You shoud go with esp8266 arduino or c programming sdk

8

It shouldn’t be that complicated @Saytinh , I’m just trying to follow a couple of guides:

But my problem seems to be that after flashing it I only get gibberish from it in the console when I should be getting text like this: http://www.xess.com/static/media/uploads/blog/devbisme/2014-12-09/change_speed.jpg

I’ve tried connecting the ESP to my 3.3V supply now and only running the tx & rx cables to the USB cable but then my flasher can’t find the card!

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You should connect GND of the breadboard with GND of the USB-serial adaptor. Do not connect VCC of the adaptor to anything. Connect VCC of the breadboard with VCC of the ESP.

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If you look for written hints to solve your problems then ask your boss to buy my book “Building an IoT Node for less than 15 $” :wink:
I use #NodeMCU as a very comfortable environment for such solutions. I my blog https://cknodemcu.wordpress.com/ you will find a description of a #DHT11 network communicating with #MQTT which should one solution for your task.

11

Thanks @Libor_Gabaj , that really helped! After flashing again now I get the right text back from the ESP. Still having problems getting it connected tough but atleast it’s a step!

Great suggestion with using the NodeMCU @Claus_Kuhnel , found a great guide online doing exactly what I want so I’ll try that to! http://vaasa.hacklab.fi/2016/02/06/esp8266-on-nodemcu-board-ds18b20-arduinoide-thingspeak/