mbed application board

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Schematics¶

mbed-014.1_b.pdf

Feature list¶

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

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 }

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 }

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 }

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 }

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 }

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 }

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

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 - This example fetches a web using

Import program HTTPClient_HelloWorld

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

14. USB Host¶

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 }

USB 3G Modem : NTP Client Hello World This example uses a Vodafone USB 3G Modem to connect to the internet and fetch the current time using NTP

Details¶

Form factor	55mm x 86mm x 19mm (with mbed)
128x32 Graphics LCD, SPI Interface	Newhaven C12332A1Z 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

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