|Primary Contact||Michael Erskine|
So I sent off to China for a NodeMCU board (for £3.55 from http://www.ebay.co.uk/itm/291505733201 at time of writing) thinking that it might be fun to have something that talks over wifi, then forgot all about it. When it arrived in the post yesterday I wondered how I use it! I plugged it into a Windows 7 development PC with the micro USB and Windows went off and installed the CP2102 UART bridge driver. So then it presented itself as a serial port in the Windows Device Manager. I pointed a terminal at it (the free and relatively open Teraterm Pro) and after some faffing worked out it wanted a 115k baudrate. A little web searching revealed that it is expecting AT commands and there's a magic command "AT+GMR" - Cool!
AT+GMR AT version:0.40.0.0(Aug 8 2015 14:45:58) SDK version:1.3.0 Ai-Thinker Technology Co.,Ltd. Build:18.104.22.168 Sep 11 2015 11:48:04 OK
But how do I load a LUA script onto it? The NodeMCU website says nowt, so a bit of web searching and it seems that Arduino IDE can be used - very cool!
The Boards Manager within recent Arduino releases takes care of the installation of toolchains and whatever magic that Arduino needs. It downloaded a metric shedload of stuff (153,527kb of who-knows-what!) and then...
AT+RST OK ets Jan 8 2013,rst cause:2, boot mode:(3,6) load 0x40100000, len 1396, room 16 tail 4 chksum 0x89 load 0x3ffe8000, len 776, room 4 tail 4 chksum 0xe8 load 0x3ffe8308, len 540, room 4 tail 8 chksum 0xc0 csum 0xc0
2nd boot version : 1.4(b1) SPI Speed : 40MHz SPI Mode : DIO SPI Flash Size & Map: 8Mbit(512KB+512KB) jump to run user1 @ 1000
n't use rtc mem data rl?�?n�dÿ Ai-Thinker Technology Co.,Ltd.
ready WIFI DISCONNECT AT+GMR
AT version:0.40.0.0(Aug 8 2015 14:45:58) SDK version:1.3.0 Ai-Thinker Technology Co.,Ltd. Build:22.214.171.124 Sep 11 2015 11:48:04 OK
So in trying to use ESPlorer to send LUA command line commands I just get lots of errors but the AT commands work fine. So I'm thinking that a firmware update might save it. Not knowing what I actually have bought is a bit of a problem! There some comparisons here: http://frightanic.com/iot/comparison-of-esp8266-nodemcu-development-boards/
2nd generation / v1.0 / V2 The V2 fixes the short comings of the initial board, it’s more narrow and fits nicely into bread boards. The chip was upgraded from a ESP-12 to a ESP-12E.
First Jiffy Programs
Using the Arduino core: -
- Using Arduino 1.6.5, I added support for the nodemcu with the Boards Manager...
- documentation for the ESP8266 Arduino Core is at...
- Not 100% sure how many digital IO pins I can use - they seem to clash with all sorts of peripherals:
- see http://esp8266.github.io/Arduino/versions/2.0.0/doc/reference.html#digital-io
- pragmatic approach is suck-it-and-see!
First Project: Status Boards
- Project Status_Boards
- See my GitHub project at https://github.com/msemtd/nodemcu-statusboard
- NodeJS server dishing up the info
- in theory this allows scaling to any number of feeds and boards
Second Project: WiFi-enabled Banjo
- Toby's LED banjo needs to host its own webserver, and perhaps its own WiFi hotspot
- project page here: WiFi-enabled Banjo
- We are riding the ESP8266 Hype-Cycle until the wheels fall off!
- ESP8266 Captive Portal https://www.hackster.io/rayburne/esp8266-captive-portal-5798ff
Possible uses for said WiFi hotspot...
- Change colour of lights.
- Provide a link to our soundclound page.
- Livestreaming from a microphone or small camera located inside banjo. Or pointed at the audience.
- Something that fucks with the people at Makerfaire in some way.
- Tiny smoke machine