Tore myself away from the TV and feeling in a programming kinda mood after a CoderDojo mentor's meeting earlier I decided to burn some code to a NodeMcu :)
http://www.nodemcu.com/index_en.html
So I followed the steps at:
https://nodemcu.readthedocs.io/en/master/en/getting-started/
And so first I made a generic build at:
https://nodemcu-build.com/index.php which e-mails you progress :)
I then download to my Windows 10 laptop the resulting binary:
nodemcu-master-7-modules-2019-03-30-20-05-51-integer.bin
I then downloaded NodeMCU PyFlasher and updated my USB serial driver. I then ran and flashed the binary. It was painless :)
Not sure how to test what was flashed though!
I think I need debug out from the device :) The pins are all labelled so GND, TX0, RX0 should do me to a USB serial converter :)
https://iotbytes.wordpress.com/nodemcu-pinout/
Well that worked straight away!
Now what to do? I want an ambient temperature probe to publish to a MQTT topic over Wifi.
Tried connecting to ESP_2871DF on 192.168.4.1 over wifi using fixed IP 192.168.4.2 but nothing shown using Explore Edge browser
So I need to read up on both UART and WIFI module as built into the binary image :)
Ah I've downloaded the firmware modules but I now need to download a program to use them!!
https://frightanic.com/iot/tools-ides-nodemcu/
I downloaded ESPlorer
https://esp8266.ru/esplorer/ and ran it (after unzipping) the serial console worked fine when connected to COM6 at 115200 baud and after reseting the NodeMCU next to download some code to it.
So I read:
#http://esp8266.ru/download/esp8266-doc/Getting%20Started%20with%20the%20ESPlorer%20IDE%20-%20Rui%20Santos.pdf
Great followed the instructions and got a flash blue LED going on my NodeMcu as file init.lua :)
Then I removed NodeMcu from laptop and ran it from a USB battery pack :)
Worked fine
(Add photo)
Now for some real code :) So over to:
https://github.com/nodemcu/nodemcu-firmware/tree/master/lua_examples
I tried the following code (with real "SSID" and "password" values):
print(wifi.sta.getip())
wifi.setmode(wifi.STATION)
station_cfg={}
station_cfg.ssid="SSID"
station_cfg.pwd="password"
station_cfg.save=true
wifi.sta.config(station_cfg)
print(wifi.sta.getip())
which produced the following Wifi Router entry:
| NODE-2871DF_Wireless | EC:FA:BC:28:71:DF | 192.168.1.146 |
Great! Now to publish to MQTT broker! Then to read a temp sensor :)
Will do this tomorrow following:
https://www.foobarflies.io/a-simple-connected-object-with-nodemcu-and-mqtt/
