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Espruino

Espruino Pico and LDR example

by shedboy71
written by shedboy71

A light-dependent resistor is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity; in other words, it exhibits photoconductivity. A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.

A photoresistor is made of a high resistance semiconductor. In the dark, a photoresistor can have a resistance as high as several megohms (MΩ), while in the light, a photoresistor can have a resistance as low as a few hundred ohms. If incident light on a photoresistor exceeds a certain frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band. The resulting free electrons (and their hole partners) conduct electricity, thereby lowering resistance. The resistance range and sensitivity of a photoresistor can substantially differ among dissimilar devices. Moreover, unique photoresistors may react substantially differently to photons within certain wavelength bands.

As you can see later in the schematics its easy to connect one of these to an Espruino Pico, you only require an LDR and a 10k resistor so that this could easily be constructed on a breadboard. I used the following module

ldr

ldr

Schematics and Layout

 

pico and ldr_schem

pico and ldr_bb

 

Code

A simple code example, we will switch on and off the on board LED 1 depending on the value that’s read. So vary the light to the LDR and see what happens.

Type the following into the Espruino web ide and the Send to your Espruino

[codesyntax lang=”javascript”]

setInterval(function() {
  var light = analogRead(A5);
  console.log(light);
  //the value is between 0 and 1
  if(light >= 0.5)
  {
    digitalWrite(LED1, 0); //led off
  }
  else
  {
    digitalWrite(LED1, 1); //led on
  }
}, 1000);

[/codesyntax]

 

Links
20PCS x 5528 Light Dependent Resistor LDR 5MM Photoresistor

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Espruino

Espruino Pico time on LCD example

by shedboy71
written by shedboy71

This is similar to the previous example, this time we will display the time on our LCD. If you are familiar with JavaScript you will recognise some of the code

These displays were used in old Nokia 5110 cell phones. It is a 84×48 pixel monochrome LCD display and you can use it for graphics, text or bitmaps. To use the display, you will require 5 digital output pins. Another pin can be used to control the backlight.

lcd5110b

lcd5110a

The display driver is a PCD8544 chip (which is another name for the display), and you can safely run the display off 3.3v

Here is the connections I used

Connection

LCD pin Espruino Pico
GND GND
LIGHT N/C
VCC 3.3v
SCLK B3
DN(MOSI) B5
D/C B13
CE B14
RST B15

Schematic

here is a schematic

pico and nokia5110_bb

Code

[codesyntax lang=”javascript”]

var g;

function draw() 
{
  g.clear();
  var t = new Date();
  var time = t.getHours()+":" + ("0"+t.getMinutes()).substr(-2);
  var secs = ("0"+t.getSeconds()).substr(-2);
  g.setFontBitmap();
  g.setFontVector(20);
  var timeWidth = g.stringWidth(time);
  g.drawString(time,(g.getWidth()-timeWidth-12)/2,10);
  g.setFontBitmap();
  g.drawString(secs,(g.getWidth()+timeWidth-8)/2,26);
  g.flip();
}

function onInit() 
{
  clearInterval();
  // Setup SPI
  var SPI1 = new SPI();
  SPI1.setup({ sck:B3, mosi:B5 });
  // Initialise the LCD
  g = require("PCD8544").connect(SPI1, B13 /*DC*/, B14 /*CE*/, B15 /*RST*/, function(){
    setInterval(draw, 1000);
  });
}

onInit();

[/codesyntax]

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Espruino

Espruino Pico and Nokia 5110 display example

by shedboy71
written by shedboy71

These displays were used in old Nokia 5110 cell phones. It is a 84×48 pixel monochrome LCD display and you can use it for graphics, text or bitmaps. To use the display, you will require 5 digital output pins. Another pin can be used to control the backlight.

lcd5110b

lcd5110a

The display driver is a PCD8544 chip (which is another name for the display), and you can safely run the display off 3.3v

Here is the connections I used

Connection

LCD pin Espruino Pico
GND GND
LIGHT N/C
VCC 3.3v
SCLK B3
DN(MOSI) B5
D/C B13
CE B14
RST B15

 

Schematic

here is a schematic

pico and nokia5110_bb

 

Code

[codesyntax lang=”javascript”]

SPI1.setup({ sck:B3, mosi:B5 });
var g = require("PCD8544").connect(SPI1, B13 /*DC*/, B14 /*CE*/, B15 /*RST*/, function() {
  g.clear();
  g.drawString("Hello",0,0);
  g.drawString("World",0,5);
});

[/codesyntax]

 

Links

1pcs/lot nokia5110 LCD Module microcontroller development

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Espruino

Espruino Pico

by shedboy71
written by shedboy71

This piece of hardware is the Espruino Pico which is designed to be programmed in Javascript ,the Pico is designed to plug right into you computer’s USB type A connector, or a USB extension lead.

espruinopico

The Pico has the following feature swhich I found interesting

Features

22 GPIO pins : 9 Analogs inputs, 21 PWM, 2 Serial, 3 SPI, 3 I2C
All GPIO is 5 volt tolerant (Arduino compatible)
Two on-board LEDs and one button.
STM32F401CDU6 CPU – ARM Cortex M4, 384kb flash, 96kb RAM

espruinopico1

You need to setup a com port, I have tried this on Windows 7 and Windows 10

Non-Windows XP Users download version 1.4.0 drivers. Unzip the file, run the executable, and then go to C:\Program Files (x86)\STMicroelectronics\Software\Virtual comport driver in Windows Explorer and double-click either dpinst_amd64.exe for 64 bit systems, ordpinst_x86.exe for 32 bit.

There is a nice webide that can be added to chrome as follows

 

Start the webdide and click on the connect and select the correct com port

espruino ide1
Code Example

This simply switches the 2 led’s on and off
[codesyntax lang=”javascript”]

var on = false;
var off = true;
setInterval(function() {
on = !on;
LED1.write(on);
off = !off;
LED2.write(off);
}, 500);

[/codesyntax]

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