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https://github.com/samzorsec/nodemcu-and-javascript

Programming NodeMCU boards with Espruino (JavaScript)
https://github.com/samzorsec/nodemcu-and-javascript

esp8266 javascript

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Programming NodeMCU boards with Espruino (JavaScript)

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README 

        
# NodeMCU board (ESP8266) with JavaScript

This repository provides a little introduction into getting going with the NodeMCU board (1.0/v2) and [Espruino](http://www.espruino.com) (JavaScript for Microcontrollers, v1.87). It provides an installation guide and some examples.



## Examples

| Title     							              	      | Description        											                              |

|-----------------------------------------------|-----------------------------------------------------------------------|

| [Hello World](01_hello_world.js)     				  | A simple **Hello World** example     					                       	|

| [Blink](02_blink_led.js)     				          | A simple example to **flash** the integrated **LED**                	|

| [Wi-Fi](03_wifi.js)     				              | A simple example to **connect** to a **Wi-Fi AP** and make the NodeMCU board available through **espruino.local**                   	|

| [HTTP Server](04_http_server.js)     				  | A simple **Web Server** to control the integrated **LED**             |



## Installation

I spent 2-3 days to make everything working, so I decided to provide a [compressed folder](firmware/Espruino_v1_87.zip) (esptool.py v1.2 & Espruino v1.87) with everything you need to flash the firmware.



You probably need to install `pyserial` for using the `esptool.py`. It can be achieved with `sudo easy_install pyserial`(macOS), `sudo apt-get install python-serial`(Linux) or `sudo pip install pyserial`.



Move inside the downloaded folder

```

cd Downloads

cd Espruino_v1_87

```



Erase the flash memory

```

python esptool.py --port /dev/tty.SLAB_USBtoUART erase_flash

```



![Erase flash](images/erase_flash.png)



Flash the NodeMCU with Espruino

```

python esptool.py  --port /dev/tty.SLAB_USBtoUART --baud 115200 write_flash --verify --flash_freq 80m --flash_mode dio --flash_size 32m 0x0000 "boot_v1.4(b1).bin" 0x1000 espruino_esp8266_user1.bin 0x37E000 blank.bin

```



![Flash firmware](images/flash_firmware.png)



After flashing the firmware, you may have to unplug/plug the NodeMCU to the computer. To test the installation process, you can use `Screen` and send some JavaScript code, like `process.memory()`or `digitalWrite(NodeMCU.D4, HIGH);` to turn on the built-in led.

```

screen /dev/tty.SLAB_USBtoUART 115200

```



![Screen](images/screen_espruino.png)



Launch Google Chrome, install the `Espruino Web IDE` ([extension](https://www.google.ch/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&sqi=2&ved=0ahUKEwiJ-qjbsvjPAhWDnBoKHcnuAfEQFggpMAE&url=https%3A%2F%2Fchrome.google.com%2Fwebstore%2Fdetail%2Fespruino-web-ide%2Fbleoifhkdalbjfbobjackfdifdneehpo&usg=AFQjCNHyNk_XkpLYJ6DNByefI7znAP5lgg&bvm=bv.136593572,d.d2s)) and modify the Baud Rate to `115200` (Espruino Web IDE > Settings > Communications > Baud Rate).



![Espruino Web IDE](images/espruino_web_ide.png)



It's possible to program the board Over-The-Air by defining a hostname and configuring a connection to it. Use the [Wi-Fi](03_wifi.js) example and add its hostname `espruino.local:23` in the configuration (Espruino Web IDE > Settings > Communications > Connect over TCP Address).



Sources

- [Run Espruino on the NodeMCU devkit](https://blog.pedesen.de/2016/06/21/run-espruino-on-the-nodemcu-devkit/)

- [Espruino Hardware Reference](http://www.espruino.com/Reference)

- [Download Espruino](http://www.espruino.com/Download)

- [CP210x USB to UART Bridge VCP Drivers](http://www.silabs.com/products/mcu/pages/usbtouartbridgevcpdrivers.aspx)

- [Esptool.py](https://github.com/themadinventor/esptool)

- [Tutorials and examples](http://www.espruino.com/Tutorials)



> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

  SOFTWARE.