Smart.js is a JavaScript engine that can run on ESP8266, a low-power WiFi microcontroller module. It allows writing firmware for ESP8266 using JavaScript instead of C. The document describes how to install Smart.js on ESP8266 by downloading the firmware from GitHub and using esptool to flash it onto the device. It then shows commands to configure WiFi and run JavaScript code directly on the ESP8266 by connecting to its serial console. Data can be sent over WiFi to a dashboard for visualization. Cesanta Software provides several other products related to embedded JavaScript usage.

1. Smart.js: JavaScript engine running
on tiny MCU
Smart.js: JavaScript engine running
on tiny MCU
Smart.js: JavaScript engine running
on tiny MCU
Smart.js: JavaScript engine running
on tiny MCU
Smart.js: JavaScript engine running
on tiny MCU
Kiwamu OkabeKiwamu OkabeKiwamu OkabeKiwamu OkabeKiwamu Okabe

2. ESP8266 hardwareESP8266 hardwareESP8266 hardwareESP8266 hardwareESP8266 hardware
☆ http://espressif.com/en/products/wroom/☆ http://espressif.com/en/products/wroom/☆ http://espressif.com/en/products/wroom/☆ http://espressif.com/en/products/wroom/☆ http://espressif.com/en/products/wroom/
☆ 32-bit low power MCU Wi-Fi Module☆ 32-bit low power MCU Wi-Fi Module☆ 32-bit low power MCU Wi-Fi Module☆ 32-bit low power MCU Wi-Fi Module☆ 32-bit low power MCU Wi-Fi Module
☆ Having integrated TCP/IP network stacks☆ Having integrated TCP/IP network stacks☆ Having integrated TCP/IP network stacks☆ Having integrated TCP/IP network stacks☆ Having integrated TCP/IP network stacks
☆ Including ADC, SDIO, UART, PWM, I2C ...☆ Including ADC, SDIO, UART, PWM, I2C ...☆ Including ADC, SDIO, UART, PWM, I2C ...☆ Including ADC, SDIO, UART, PWM, I2C ...☆ Including ADC, SDIO, UART, PWM, I2C ...
☆ Small form factor of only 18mm x 20mm☆ Small form factor of only 18mm x 20mm☆ Small form factor of only 18mm x 20mm☆ Small form factor of only 18mm x 20mm☆ Small form factor of only 18mm x 20mm
☆ 550 yen at Akizukidenshi!☆ 550 yen at Akizukidenshi!☆ 550 yen at Akizukidenshi!☆ 550 yen at Akizukidenshi!☆ 550 yen at Akizukidenshi!

3. Smart.js can run on ESP8266Smart.js can run on ESP8266Smart.js can run on ESP8266Smart.js can run on ESP8266Smart.js can run on ESP8266
https://www.cesanta.com/developer/smartjshttps://www.cesanta.com/developer/smartjshttps://www.cesanta.com/developer/smartjshttps://www.cesanta.com/developer/smartjshttps://www.cesanta.com/developer/smartjs

4. Write Smart.js firmwareWrite Smart.js firmwareWrite Smart.js firmwareWrite Smart.js firmwareWrite Smart.js firmware
Download flashnchips-win.zip from https://
github.com/cesanta/smart.js/releases, and
write the firmware into ESP8266 using
esptool.py https://github.com/
themadinventor/esptool.
Download flashnchips-win.zip from https://
github.com/cesanta/smart.js/releases, and
write the firmware into ESP8266 using
esptool.py https://github.com/
themadinventor/esptool.
Download flashnchips-win.zip from https://
github.com/cesanta/smart.js/releases, and
write the firmware into ESP8266 using
esptool.py https://github.com/
themadinventor/esptool.
Download flashnchips-win.zip from https://
github.com/cesanta/smart.js/releases, and
write the firmware into ESP8266 using
esptool.py https://github.com/
themadinventor/esptool.
Download flashnchips-win.zip from https://
github.com/cesanta/smart.js/releases, and
write the firmware into ESP8266 using
esptool.py https://github.com/
themadinventor/esptool.
$�unar�flashnchips-win.zip
$�cd�flashnchips-win/firmware/ESP8266/Smart.js
$�esptool.py�--baud�115200�--port�/dev/ttyUSB0�write_flash�0x00000�
0x00000.bin�0x11000�0x11000.bin�0x6d000�0x6d000.bin
$�unar�flashnchips-win.zip
$�cd�flashnchips-win/firmware/ESP8266/Smart.js
$�esptool.py�--baud�115200�--port�/dev/ttyUSB0�write_flash�0x00000�
0x00000.bin�0x11000�0x11000.bin�0x6d000�0x6d000.bin
$�unar�flashnchips-win.zip
$�cd�flashnchips-win/firmware/ESP8266/Smart.js
$�esptool.py�--baud�115200�--port�/dev/ttyUSB0�write_flash�0x00000�
0x00000.bin�0x11000�0x11000.bin�0x6d000�0x6d000.bin
$�unar�flashnchips-win.zip
$�cd�flashnchips-win/firmware/ESP8266/Smart.js
$�esptool.py�--baud�115200�--port�/dev/ttyUSB0�write_flash�0x00000�
0x00000.bin�0x11000�0x11000.bin�0x6d000�0x6d000.bin
$�unar�flashnchips-win.zip
$�cd�flashnchips-win/firmware/ESP8266/Smart.js
$�esptool.py�--baud�115200�--port�/dev/ttyUSB0�write_flash�0x00000�
0x00000.bin�0x11000�0x11000.bin�0x6d000�0x6d000.bin

5. JavaScript REPL on terminalJavaScript REPL on terminalJavaScript REPL on terminalJavaScript REPL on terminalJavaScript REPL on terminal
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
Device�id:�//api.cesanta.com/d/dev_84227�
Device�psk:�psk_36751�
Cloud:�//api.cesanta.com�
HELO!�Type�some�JS.�See�https://github.com/cesanta/smart.js�for�more�info.�
smartjs�28904/2256$�1+1
2
smartjs�28904/2256$�1+"hoge"
1hoge
smartjs�29184/2256$�File.list(".")
["cloud.js","clubby.js","demo.js","gpio.js","I2C.js","MC24FC.js","MC24FC_tes
t.js","MCP9808.js","MCP9808_test.js","MPL115A1.js","smart.js","swupdate.js","
sys_rts.js","user.js","sys_config.json"]
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
Device�id:�//api.cesanta.com/d/dev_84227�
Device�psk:�psk_36751�
Cloud:�//api.cesanta.com�
HELO!�Type�some�JS.�See�https://github.com/cesanta/smart.js�for�more�info.�
smartjs�28904/2256$�1+1
2
smartjs�28904/2256$�1+"hoge"
1hoge
smartjs�29184/2256$�File.list(".")
["cloud.js","clubby.js","demo.js","gpio.js","I2C.js","MC24FC.js","MC24FC_tes
t.js","MCP9808.js","MCP9808_test.js","MPL115A1.js","smart.js","swupdate.js","
sys_rts.js","user.js","sys_config.json"]
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
Device�id:�//api.cesanta.com/d/dev_84227�
Device�psk:�psk_36751�
Cloud:�//api.cesanta.com�
HELO!�Type�some�JS.�See�https://github.com/cesanta/smart.js�for�more�info.�
smartjs�28904/2256$�1+1
2
smartjs�28904/2256$�1+"hoge"
1hoge
smartjs�29184/2256$�File.list(".")
["cloud.js","clubby.js","demo.js","gpio.js","I2C.js","MC24FC.js","MC24FC_tes
t.js","MCP9808.js","MCP9808_test.js","MPL115A1.js","smart.js","swupdate.js","
sys_rts.js","user.js","sys_config.json"]
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
Device�id:�//api.cesanta.com/d/dev_84227�
Device�psk:�psk_36751�
Cloud:�//api.cesanta.com�
HELO!�Type�some�JS.�See�https://github.com/cesanta/smart.js�for�more�info.�
smartjs�28904/2256$�1+1
2
smartjs�28904/2256$�1+"hoge"
1hoge
smartjs�29184/2256$�File.list(".")
["cloud.js","clubby.js","demo.js","gpio.js","I2C.js","MC24FC.js","MC24FC_tes
t.js","MCP9808.js","MCP9808_test.js","MPL115A1.js","smart.js","swupdate.js","
sys_rts.js","user.js","sys_config.json"]
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
Device�id:�//api.cesanta.com/d/dev_84227�
Device�psk:�psk_36751�
Cloud:�//api.cesanta.com�
HELO!�Type�some�JS.�See�https://github.com/cesanta/smart.js�for�more�info.�
smartjs�28904/2256$�1+1
2
smartjs�28904/2256$�1+"hoge"
1hoge
smartjs�29184/2256$�File.list(".")
["cloud.js","clubby.js","demo.js","gpio.js","I2C.js","MC24FC.js","MC24FC_tes
t.js","MCP9808.js","MCP9808_test.js","MPL115A1.js","smart.js","swupdate.js","
sys_rts.js","user.js","sys_config.json"]

6. Connect dashboard.cesanta.comConnect dashboard.cesanta.comConnect dashboard.cesanta.comConnect dashboard.cesanta.comConnect dashboard.cesanta.com

7. Send random data from ESP8266Send random data from ESP8266Send random data from ESP8266Send random data from ESP8266Send random data from ESP8266
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
smartjs�29032/2268$�Wifi.setup('XXXXXXXXXXXXX','YYYYYYYYYY')
true
smartjs�29208/2376$�Wifi.ip()
192.168.179.3
smartjs�29016/2280$�Wifi.status()
got�ip
smartjs�29112/2280$�demo()
Initializing�demo�data�source
Starting�temperature�push�demo�in�background,�type�Debug.mode(1)�to�see�
activity
undefined
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
smartjs�29032/2268$�Wifi.setup('XXXXXXXXXXXXX','YYYYYYYYYY')
true
smartjs�29208/2376$�Wifi.ip()
192.168.179.3
smartjs�29016/2280$�Wifi.status()
got�ip
smartjs�29112/2280$�demo()
Initializing�demo�data�source
Starting�temperature�push�demo�in�background,�type�Debug.mode(1)�to�see�
activity
undefined
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
smartjs�29032/2268$�Wifi.setup('XXXXXXXXXXXXX','YYYYYYYYYY')
true
smartjs�29208/2376$�Wifi.ip()
192.168.179.3
smartjs�29016/2280$�Wifi.status()
got�ip
smartjs�29112/2280$�demo()
Initializing�demo�data�source
Starting�temperature�push�demo�in�background,�type�Debug.mode(1)�to�see�
activity
undefined
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
smartjs�29032/2268$�Wifi.setup('XXXXXXXXXXXXX','YYYYYYYYYY')
true
smartjs�29208/2376$�Wifi.ip()
192.168.179.3
smartjs�29016/2280$�Wifi.status()
got�ip
smartjs�29112/2280$�demo()
Initializing�demo�data�source
Starting�temperature�push�demo�in�background,�type�Debug.mode(1)�to�see�
activity
undefined
$�picocom�-b�115200�--omap�crcrlf�/dev/ttyUSB0
smartjs�29032/2268$�Wifi.setup('XXXXXXXXXXXXX','YYYYYYYYYY')
true
smartjs�29208/2376$�Wifi.ip()
192.168.179.3
smartjs�29016/2280$�Wifi.status()
got�ip
smartjs�29112/2280$�demo()
Initializing�demo�data�source
Starting�temperature�push�demo�in�background,�type�Debug.mode(1)�to�see�
activity
undefined

8. Watch dashboard.cesanta.comWatch dashboard.cesanta.comWatch dashboard.cesanta.comWatch dashboard.cesanta.comWatch dashboard.cesanta.com

9. Other products by Cesanta SoftwareOther products by Cesanta SoftwareOther products by Cesanta SoftwareOther products by Cesanta SoftwareOther products by Cesanta Software
*�Mongoose:�Net�library�supporting�TLS/HTTP/Websocket/JSON-RPC/MQTT/CoAP/DNS
��https://github.com/cesanta/mongoose
*�V7:�JavaScript�engine�deployed�in�two�files�v7.h�and�v7.c
��https://github.com/cesanta/v7
*�Frozen:�JSON�parser�and�generator
��https://github.com/cesanta/frozen/
*�SLRE:�Regular�Expression�library
��https://github.com/cesanta/slre/
*�Krypton:�TLS/DTLS�library,�source�and�binary�compatible�OpenSSL�subset
��https://github.com/cesanta/krypton
*�Flashnchips:�Firmware�writer�for�Windows�and�Mac�OS�X
��https://github.com/cesanta/smart.js/tree/master/flashnchips
*�GDB�server:�Debugger�stub�for�remote�debug
��https://github.com/cesanta/smart.js/tree/master/platforms/esp8266#gdb
*�SPIFFS:�SPI�Flash�File�System�(not�Cesanta�product)
��https://github.com/pellepl/spiffs
*�Mongoose:�Net�library�supporting�TLS/HTTP/Websocket/JSON-RPC/MQTT/CoAP/DNS
��https://github.com/cesanta/mongoose
*�V7:�JavaScript�engine�deployed�in�two�files�v7.h�and�v7.c
��https://github.com/cesanta/v7
*�Frozen:�JSON�parser�and�generator
��https://github.com/cesanta/frozen/
*�SLRE:�Regular�Expression�library
��https://github.com/cesanta/slre/
*�Krypton:�TLS/DTLS�library,�source�and�binary�compatible�OpenSSL�subset
��https://github.com/cesanta/krypton
*�Flashnchips:�Firmware�writer�for�Windows�and�Mac�OS�X
��https://github.com/cesanta/smart.js/tree/master/flashnchips
*�GDB�server:�Debugger�stub�for�remote�debug
��https://github.com/cesanta/smart.js/tree/master/platforms/esp8266#gdb
*�SPIFFS:�SPI�Flash�File�System�(not�Cesanta�product)
��https://github.com/pellepl/spiffs
*�Mongoose:�Net�library�supporting�TLS/HTTP/Websocket/JSON-RPC/MQTT/CoAP/DNS
��https://github.com/cesanta/mongoose
*�V7:�JavaScript�engine�deployed�in�two�files�v7.h�and�v7.c
��https://github.com/cesanta/v7
*�Frozen:�JSON�parser�and�generator
��https://github.com/cesanta/frozen/
*�SLRE:�Regular�Expression�library
��https://github.com/cesanta/slre/
*�Krypton:�TLS/DTLS�library,�source�and�binary�compatible�OpenSSL�subset
��https://github.com/cesanta/krypton
*�Flashnchips:�Firmware�writer�for�Windows�and�Mac�OS�X
��https://github.com/cesanta/smart.js/tree/master/flashnchips
*�GDB�server:�Debugger�stub�for�remote�debug
��https://github.com/cesanta/smart.js/tree/master/platforms/esp8266#gdb
*�SPIFFS:�SPI�Flash�File�System�(not�Cesanta�product)
��https://github.com/pellepl/spiffs
*�Mongoose:�Net�library�supporting�TLS/HTTP/Websocket/JSON-RPC/MQTT/CoAP/DNS
��https://github.com/cesanta/mongoose
*�V7:�JavaScript�engine�deployed�in�two�files�v7.h�and�v7.c
��https://github.com/cesanta/v7
*�Frozen:�JSON�parser�and�generator
��https://github.com/cesanta/frozen/
*�SLRE:�Regular�Expression�library
��https://github.com/cesanta/slre/
*�Krypton:�TLS/DTLS�library,�source�and�binary�compatible�OpenSSL�subset
��https://github.com/cesanta/krypton
*�Flashnchips:�Firmware�writer�for�Windows�and�Mac�OS�X
��https://github.com/cesanta/smart.js/tree/master/flashnchips
*�GDB�server:�Debugger�stub�for�remote�debug
��https://github.com/cesanta/smart.js/tree/master/platforms/esp8266#gdb
*�SPIFFS:�SPI�Flash�File�System�(not�Cesanta�product)
��https://github.com/pellepl/spiffs
*�Mongoose:�Net�library�supporting�TLS/HTTP/Websocket/JSON-RPC/MQTT/CoAP/DNS
��https://github.com/cesanta/mongoose
*�V7:�JavaScript�engine�deployed�in�two�files�v7.h�and�v7.c
��https://github.com/cesanta/v7
*�Frozen:�JSON�parser�and�generator
��https://github.com/cesanta/frozen/
*�SLRE:�Regular�Expression�library
��https://github.com/cesanta/slre/
*�Krypton:�TLS/DTLS�library,�source�and�binary�compatible�OpenSSL�subset
��https://github.com/cesanta/krypton
*�Flashnchips:�Firmware�writer�for�Windows�and�Mac�OS�X
��https://github.com/cesanta/smart.js/tree/master/flashnchips
*�GDB�server:�Debugger�stub�for�remote�debug
��https://github.com/cesanta/smart.js/tree/master/platforms/esp8266#gdb
*�SPIFFS:�SPI�Flash�File�System�(not�Cesanta�product)
��https://github.com/pellepl/spiffs

10. PR: Join the Functional IoT Meetup!PR: Join the Functional IoT Meetup!PR: Join the Functional IoT Meetup!PR: Join the Functional IoT Meetup!PR: Join the Functional IoT Meetup!