Components » mbed Application Board

mbed Application Board

Application board for mbed NXP LPC1768

Hello World

Import program app-board-LCD

Example program printing text to the LCD on the mbed application board

Library

Notes

The new application board has been designed to enable the maximum number of potential experiments and projects, with the minimum footprint.

/media/uploads/chris/app_board_front_small_map1.png

/media/uploads/chris/app_board_back_small.png

Although that there are 2x20 way headers for the mbed for jumper wiring pins off-board, it's a fairly well encapsulated platform.

Where to buy

Feature list

128x32 Graphics LCD
5 way joystick
2 x Potentiometers
3.5mm Audio jack (Analog Out)
Speaker, PWM connected
3 Axis +/1 1.5g Accelerometer
3.5mm Audio jack (Analog In)
2 x Servo motor headers
RGB LED, PWM connected
USB-mini-B Connector
Temperature sensor
Socket for for Xbee (Zigbee) or RN-XV (Wifi)
RJ45 Ethernet Connector
USB-A Connector
1.3mm DC Jack input

1. 128x32 LCD

An example program to print text and variables to the LCD

Import program
app-board-LCD - main.cpp

00001 #include "mbed.h"
00002 #include "C12832.h"
00003 
00004 
00005 C12832 lcd(p5, p7, p6, p8, p11);
00006 
00007 int main()
00008 {
00009     int j=0;
00010     lcd.cls();
00011     lcd.locate(0,3);
00012     lcd.printf("mbed application board!");
00013 
00014     while(true) {   // this is the third thread
00015         lcd.locate(0,15);
00016         lcd.printf("Counting : %d",j);
00017         j++;
00018         wait(1.0);
00019     }
00020 }

Import library C12832

C12832 LCD with generic interface

A full featured test program :

Import program lab1

test program for mbed Lab Board

Demo for using bitmap graphic :

2. Joystick

An example program for the mbed application board that uses the joystick button. LED1,2,3,4 light in sequence with up, down, left, right, and pushing the button lights them all (as a 80's computer gamer, I want to call this "fire!")

Note: that the orientation is looking at the screen in landscape, with the row of connectors at the bottom

Import program
app-board-Joystick - main.cpp

00001 #include "mbed.h"
00002 
00003 BusIn joy(p15,p12,p13,p16);
00004 DigitalIn fire(p14);
00005 
00006 BusOut leds(LED1,LED2,LED3,LED4);
00007 
00008 int main()
00009 {
00010     while(1) {
00011         if (fire) {
00012             leds=0xf;
00013         } else {
00014             leds=joy;
00015         }
00016         wait(0.1);
00017     }
00018 }

Import program kill_the_bit

Classic Kill the Bit game for the application board. Press joystick down to kill off the leftmost LED, but if your timing is off more LEDs turn on. LEDs flash and speaker beeps when all LEDs are off.

3. 2 x Potentiometers

To be completed

4. Analog Out

Plug in a pair of earphones.

Import program
app-board-AnalogOut - main.cpp

00001 #include "mbed.h"
00002 
00003 AnalogOut Aout(p18);
00004 AnalogIn pot1(p19);
00005 
00006 int main()
00007 {
00008     while(1) {
00009         for(float i=0.0; i<1.0; i+=0.1) {
00010             Aout = i;
00011             wait(0.00001+(0.0001*pot1.read()));
00012         }
00013     }
00014 }

Play music from a *.wav audio file on PC speakers. See Application Board Waveplayer Demo for complete instructions.

Import program AppBoard_Waveplayer

A wave player demo setup for the mbed application board. Reads a wave file from a USB flash drive, and outputs to the onboard speaker (very low volume) and the analog audio out jack that can be connected to a set of PC speakers for more volume. A wave file for the demo is available at http://mbed.org/media/uploads/4180_1/sample.wav. Copy it to the USB drive. See http://mbed.org/users/4180_1/notebook/application-board-waveplayer-demo/ for more details and instructions.

5. Speaker

A frequency sweep. Press the fire button to to play it again!

Import program
app-board-Speaker - main.cpp

00001 #include "mbed.h"
00002 
00003 DigitalIn fire(p14);
00004 PwmOut spkr(p26);
00005 
00006 int main()
00007 {
00008     while (1) {
00009         for (float i=2000.0; i<10000.0; i+=100) {
00010             spkr.period(1.0/i);
00011             spkr=0.5;
00012             wait(0.1);
00013         }
00014         spkr=0.0;
00015         while(!fire) {}
00016     }
00017 }

Play music from a *.wav audio file on the speaker. See Application Board Waveplayer Demo for complete instructions.

Import program AppBoard_Waveplayer

6. 3 Axis Accelerometer

Import program
MMA7660_HelloWorld - main.cpp

00001 //Uses the measured z-acceleration to drive leds 2 and 3 of the mbed
00002 
00003 #include "mbed.h"
00004 #include "MMA7660.h"
00005 
00006 MMA7660 MMA(p28, p27);
00007 
00008 DigitalOut connectionLed(LED1);
00009 PwmOut Zaxis_p(LED2);
00010 PwmOut Zaxis_n(LED3);
00011 
00012 int main() {  
00013     if (MMA.testConnection())
00014         connectionLed = 1;
00015         
00016     while(1) {
00017         Zaxis_p = MMA.z();
00018         Zaxis_n = -MMA.z();
00019     }
00020 
00021 }

Import library MMA7660

Library for the MMA7660 triple axis accelerometer

Import program app-board-Bubble-Level

This demo uses the application board’s three axis accelerometer and the LCD display working in graphics mode to build an electronic version of a bubble level.

7. Analog In

To be completed

8. Servo Motor

An example program that uses the two potentiometers to set the position of the servo motors. You'll need to supply 6v into the DC socket, (1.3mm, center/tip positive)

Import program
app-board-Servo - main.cpp

00001 #include "mbed.h"
00002 #include "Servo.h"
00003 
00004 Servo s1(p21);
00005 Servo s2(p22);
00006 
00007 AnalogIn p1(p19);
00008 AnalogIn p2(p20);
00009 
00010 int main() {
00011     while(1) {
00012         s1=p1;
00013         s2=p2;        
00014         wait(0.1);
00015     }
00016 }

Import library Servo

A class to control a model R/C servo, using a PwmOut

9. RGB LED

An example program that cycles the on board RGB LED through various colours.

Information

The RGB LED is common anode, so that "0" is on, and "1" is off. For PWM, the closer to 0.0 the brighter, the closer to 1.0 the dimmer. use (1.0 - value) to invert.

Import program
app-board-RGB - main.cpp

00001 #include "mbed.h"
00002 
00003 PwmOut r (p23);
00004 PwmOut g (p24);
00005 PwmOut b (p25);
00006 
00007 int main()
00008 {
00009     r.period(0.001);
00010     while(1) {
00011         for(float i = 0.0; i < 1.0 ; i += 0.001) {
00012             float p = 3 * i;
00013             r = 1.0 - ((p < 1.0) ? 1.0 - p : (p > 2.0) ? p - 2.0 : 0.0);
00014             g = 1.0 - ((p < 1.0) ? p : (p > 2.0) ? 0.0 : 2.0 - p);
00015             b = 1.0 - ((p < 1.0) ? 0.0 : (p > 2.0) ? 3.0 - p : p - 1.0);  ;  
00016             wait (0.01);
00017         }
00018     }
00019 }

Import program app-board-RGB2

Example program to cycle the RGB LED on the mbed application board through all colours

10. USB Device

Import program
USBMouse_HelloWorld - main.cpp

00001 #include "mbed.h"
00002 #include "USBMouse.h"
00003 
00004 USBMouse mouse;
00005 
00006 int main() {
00007     int16_t x = 0;
00008     int16_t y = 0;
00009     int32_t radius = 10;
00010     int32_t angle = 0;
00011 
00012     while (1) {
00013         x = cos((double)angle*3.14/180.0)*radius;
00014         y = sin((double)angle*3.14/180.0)*radius;
00015         
00016         mouse.move(x, y);
00017         angle += 3;
00018         wait(0.001);
00019     }
00020 }

Import program USBKeyboard_HelloWorld

USBKeyboard Hello World

Import program USBSerial_HelloWorld

USBSerial Hello World

Import program USBHID_HelloWorld

USBHID Hello World

11. LM75B Temperature sensor

An example program to read the current temperature from the LM75B and display it on the LCD

Import program
app-board-LM75B - main.cpp

00001 #include "mbed.h"
00002 #include "LM75B.h"
00003 #include "C12832.h"
00004 
00005 C12832 lcd(p5, p7, p6, p8, p11);
00006 
00007 LM75B sensor(p28,p27);
00008 Serial pc(USBTX,USBRX);
00009 
00010 int main ()
00011 {
00012 
00013     //Try to open the LM75B
00014     if (sensor.open()) {
00015         printf("Device detected!\n");
00016 
00017         while (1) {
00018             lcd.cls();
00019             lcd.locate(0,3);
00020             lcd.printf("Temp = %.3f\n", (float)sensor);
00021             wait(1.0);
00022         }
00023 
00024     } else {
00025         error("Device not detected!\n");
00026     }
00027 
00028 }

Import library LM75B

A simply library for the LM75B I2C temperature sensor

12. Xbee socket

Websocket over Wifly - Hello World - This example send messages to the mbed websocker server over a wifi connection using the RN-XV Wifly module.

The output can be seen at

http:sockets.mbed.org/app-board/viewer

Import program
app-board-Wifly-Websocket - main.cpp

00001 #include "mbed.h"
00002 #include "WiflyInterface.h"
00003 #include "Websocket.h"
00004 #include "LM75B.h"
00005 #include "MMA7660.h"
00006 
00007 
00008 /* wifly interface:
00009 *     - p9 and p10 are for the serial communication
00010 *     - p30 is for the reset pin
00011 *     - p29 is for the connection status
00012 *     - "mbed" is the ssid of the network
00013 *     - "password" is the password
00014 *     - WPA is the security
00015 */
00016 
00017 WiflyInterface wifly(p9, p10, p30, p29, "mbed", "password", WPA);
00018 
00019 // accelerometer
00020 MMA7660 acc(p28, p27);
00021 
00022 // temperature sensor
00023 LM75B tmp(p28,p27);
00024 
00025 
00026 int main()
00027 {
00028     char json_str[100];
00029 
00030     wifly.init(); //Use DHCP
00031     while (!wifly.connect());
00032     printf("IP Address is %s\n\r", wifly.getIPAddress());
00033 
00034     // See the output on http://sockets.mbed.org/app-board/viewer
00035     Websocket ws("ws://sockets.mbed.org:443/ws/app-board/wo");
00036     
00037     // connect WS server
00038     while (!ws.connect());
00039 
00040     while (1) {
00041         // create json string with acc/tmp data
00042         sprintf(json_str, "{\"id\":\"app_board_wifly_EW2013\",\"ax\":%d,\"ay\":%d,\"az\":%d, \"tmp\":%d}", (int)(acc.x()*360), (int)(acc.y()*360), (int)(acc.z()*360), (int)tmp.read());
00043         
00044         // send str
00045         ws.send(json_str);
00046         
00047         wait(0.1);
00048     }
00049 }

HTTP Client over Wifly - Hello World

Import program app-board-Wifly-HTTPClient

An example program using the HTTP Client over wifly, creat

13. Ethernet Interface

NTP Hello World - This example fetches the the time using NTP, and prints it over the USB Serial interface. Be sure to have been through /handbook/SerialPC to make sure you have a serial console

Import program NTPClient_HelloWorld

Simple example demonstrating how to use the NTP Client to set the time

HTTP Client Hello World

Import program HTTPClient_HelloWorld

Simple example demonstrating how to use GET & POST requests with the HTTP Client

Websocket Accelerometer-Temperature demo - This example streams acceleration and temperature data to a websocket server. Visit app-board viewer to have a real time feed.

Import program app-board-Ethernet-Websocket

Modifed version from Samuel Mokrani Changed URL to push data to sensor page Added visualisation page URL as a comment

WiFly-xively-jumpstart-demo - Xively Jumpstart demo with WiFly module.

Import program WiFly-xively-jumpstart-demo

Xively Jumpstart Demo with WiFly module

14. USB Host

Important!

When using the mbed as a USB host, 15k Ohm pull down resistors are needed on the D+ and D- signals, as per the USB specification. This can be achieved by switching both switches the DIP switch to the "USB Host" position

SW1

Flash disk Hello World This example program writes the file "test.csv" to a USB flash stick, taking 100 samples (20 per second for 5 seconds) from pot1. The resulting CSV file can easily be plotted as a graph in Excel!

Import program
mbed-App-USBFlash - main.cpp

00001 #include "mbed.h"
00002 #include "MSCFileSystem.h"
00003 
00004 MSCFileSystem fs("fs");
00005 DigitalOut led(LED1);
00006 AnalogIn pot1(p19);
00007 
00008 int main()
00009 {
00010     FILE *fp = fopen("/fs/test.csv","w");
00011     printf("Create filehandle for test.csv\n");
00012 
00013     printf("Writing to file\n");
00014     for (int i=0; i<100; i++)  {
00015         fprintf(fp,"%.2f\n",pot1.read());
00016         wait(0.05);
00017         led=!led;
00018     }
00019 
00020     fclose(fp);
00021     printf("Close the handle\n");
00022     led=1;
00023 }

Details

Form factor	55mm x 86mm x 19mm (with mbed)
128x32 Graphics LCD, SPI Interface	Newhaven C12832A1Z MOSI:p5 nRESET:p6 SCK:p7 A0:p8
3 Axis +/1 1.5g Accelerometer,I2C Interface	Freescale MMA7660 SCL:p27 SDA:p28 Address:0x98
Temperature sensor	LM75B SCL:p27 SDA:p28 Address:0x90
5 way Joystick	ALPS SKRHADE010 Down:p12 Left:p13 Centre:p14 Up:p15 Right:p16
2 x Potentiometers	Iskra PNZ10ZA, 10k Pot 1 (left) :p19 Pot 2 (right):p20
2 x 3.5mm Audio jack (Analog In/Out)	CUI Inc SJ-3523-SMT Analog In:p17 Analog Out:p18
2 x Servo motor headers	PWM1:p22 PWM2:p21
RGB LED, PWM connected	Cree Inc CLV1A-FKB Red:p23 Green:p24 Blue:p25
Speaker, PWM Connected	MULTICOMP MCSMT-8030B-3717 p26
USB-B Connector	Neltron, 5075ABMR-05-SM1
USB-A Connector	MULTICOMP,USB-A-V
RJ45 Ethernet conenctor	Pulse Jack, J00-0045NL
1.3mm DC Jack input	CLIFF, FC68145S 1.3mm 6v-9v Centre positive