<s>
Espruino	B-Device
is	O
an	O
open-source	O
JavaScript	B-Language
interpreter	O
for	O
single	B-Device
board	I-Device
microcontrollers	I-Device
.	O
</s>
<s>
Espruino	B-Device
was	O
created	O
by	O
Gordon	O
Williams	O
in	O
2012	O
as	O
an	O
attempt	O
to	O
make	O
microcontroller	B-Architecture
development	O
truly	O
multiplatform	O
.	O
</s>
<s>
Though	O
initially	O
not	O
open-source	O
,	O
the	O
Espruino	B-Device
firmware	O
was	O
offered	O
as	O
a	O
free	O
download	O
for	O
STM32	O
microcontrollers	B-Architecture
.	O
</s>
<s>
Since	O
the	O
original	O
Espruino	B-Device
board	O
,	O
there	O
have	O
been	O
a	O
number	O
of	O
new	O
official	O
development	O
boards	O
including	O
the	O
small	O
USB	O
thumb-drive-sized	O
Espruino	B-Device
Pico	O
,	O
the	O
Wifi-equipped	O
Espruino	B-Device
WiFi	O
,	O
the	O
Puck.js	O
with	O
built-in	O
Bluetooth	O
and	O
the	O
Pixl.js	O
with	O
a	O
built-in	O
LC	B-Device
display	I-Device
and	O
Arduino	O
shield	O
compatibility	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
official	O
boards	O
,	O
Espruino	B-Device
runs	O
on	O
approximately	O
40	O
other	O
types	O
of	O
development	O
boards	O
including	O
the	O
ESP8266	B-Device
and	O
BangleJS	O
smartwatch	O
.	O
</s>
<s>
There	O
is	O
a	O
large	O
body	O
of	O
reference	O
material	O
for	O
Espruino	B-Device
including	O
over	O
100	O
tutorials	O
as	O
well	O
as	O
the	O
book	O
Making	O
Things	O
Smart	O
which	O
contains	O
a	O
selection	O
of	O
hardware	O
projects	O
that	O
can	O
be	O
created	O
with	O
Espruino-based	O
microcontrollers	B-Architecture
.	O
</s>
<s>
To	O
achieve	O
maximal	O
memory	O
efficiency	O
,	O
Espruino	B-Device
executes	O
code	O
from	O
source	O
directly	O
inside	O
the	O
parser	O
,	O
without	O
the	O
use	O
of	O
an	O
Abstract	B-Data_Structure
Syntax	I-Data_Structure
Tree	I-Data_Structure
or	O
intermediate	O
bytecode	O
.	O
</s>
<s>
The	O
first	O
official	O
development	O
board	O
was	O
the	O
Original	O
Espruino	B-Device
.	O
</s>
<s>
The	O
Original	O
Espruino	B-Device
was	O
followed	O
by	O
the	O
Espruino	B-Device
Pico	O
,	O
Espruino	B-Device
WiFi	O
,	O
Puck.js	O
and	O
Pixl.js	O
.	O
</s>
<s>
Espruino	B-Device
programs	O
are	O
written	O
using	O
JavaScript	B-Language
.	O
</s>
<s>
The	O
Espruino	B-Device
IDE	O
is	O
available	O
as	O
a	O
web-based	O
app	O
,	O
a	O
Google	O
Chrome	O
App	O
and	O
as	O
a	O
native	O
Windows	O
application	O
.	O
</s>
<s>
Alternative	O
methods	O
of	O
programming	O
Espruino	B-Device
boards	O
include	O
using	O
terminal	O
programs	O
such	O
as	O
PuTTY	B-Operating_System
on	O
Windows	O
.	O
</s>
<s>
All	O
of	O
Espruino	B-Device
is	O
Open	O
Source	O
.	O
</s>
