Show Posts
Pages: 1 ... 8 9 [10] 11 12 ... 32
136  Using Arduino / Displays / Re: Arduino Uno + SeeedStudio Touch Shield + SeeedStudio SD Card Shield on: March 03, 2014, 04:44:41 pm
Have you tried contacting Seeed about the problem?
137  Using Arduino / Programming Questions / Re: Questions on a Seeed studio gprs shield v1.4 11A12 on: March 02, 2014, 03:43:21 pm
In very general terms:

First you need to decide how you are going to handle an incoming text. They can either be sent straight to the serial port of the modem, or to memory and a notification that one has been received sent to the serial port.

Once you have decided that you need to tell the modem using the AT+CNMI command.

Then you need to write the code to read the message from your chosen source, and act upon it.

Then send a message back to the sending number using the AT+CMGS command.

If you store the messages in memory you can typically store 50 messages on the sim so you need to consider some sort of housekeeping.
138  Using Arduino / Project Guidance / Re: Test GSM modem on: March 02, 2014, 03:27:41 pm
About half way down this page is a script to load onto the Arduino. Connect the RX / TX pins to pins 7 & 8 of the Arduino and the Arduino to the computer, and then open the Serial Monitor. Don't forget that the modems do draw quite a bit of power when actually working, although it does remind you of that on the link you provided.

The script is a simple repeater. Whatever you type in the Serial Monitor will be sent to the SIM900, and anything received from the SIM900 will be relayed to the Serial Monitor. Check the baud rates before you begin.
139  Using Arduino / Project Guidance / Re: which fan should i buy 12V, 0.15 amp or 12V,3amp? on: March 02, 2014, 02:19:36 pm
The amount of air moved is dependent on the speed of rotation and pitch of the blades, but that information is not to hand. Can you have a demonstration of the two types and make a decision then?

My only observation would be that 12V 0.15A sounds a little on the feeble side, model railway motors can draw more than that.
140  Using Arduino / Project Guidance / Re: which fan should i buy 12V, 0.15 amp or 12V,3amp? on: March 02, 2014, 01:27:25 pm
You are the one with the datasheets. What do they tell you about the different fans?
141  Using Arduino / Project Guidance / Re: Test GSM modem on: March 02, 2014, 01:07:28 pm
What product are you trying to connect to the Arduino? There are many (ok, a few!) that use the SIM900. A link would be useful.
142  Using Arduino / Programming Questions / Re: A working sketch for DS1302 real time module? on: February 26, 2014, 03:30:50 pm
This is the 'standard' clock chip read. Most I've come across all use the same address (0x68), all that changes is functionality - memory, alarms, etc.

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib

#include <Wire.h>
#include "RTClib.h"


void setup () {

  if (! RTC.isrunning()) {
    Serial.println("RTC is NOT running!");
    // following line sets the RTC to the date & time this sketch was compiled
    RTC.adjust(DateTime(__DATE__, __TIME__));

void loop () {
    DateTime now =;
    Serial.print(now.year(), DEC);
    Serial.print(now.month(), DEC);
    Serial.print(, DEC);
    Serial.print(' ');
    Serial.print(now.hour(), DEC);
    Serial.print(now.minute(), DEC);
    Serial.print(now.second(), DEC);
    Serial.print(" since midnight 1/1/1970 = ");
    Serial.print("s = ");
    Serial.print(now.unixtime() / 86400L);
    // calculate a date which is 7 days and 30 seconds into the future
    DateTime future (now.unixtime() + 7 * 86400L + 30);
    Serial.print(" now + 7d + 30s: ");
    Serial.print(future.year(), DEC);
    Serial.print(future.month(), DEC);
    Serial.print(, DEC);
    Serial.print(' ');
    Serial.print(future.hour(), DEC);
    Serial.print(future.minute(), DEC);
    Serial.print(future.second(), DEC);

The library I use is by JeeLabs -
143  Products / Arduino GSM Shield / Re: GSM shield not working with tmobile SIM on: February 26, 2014, 03:13:13 pm
Can you better explain the problems you're having? I bought an O2 sim at the weekend, put it in a pre pay phone, added £10 credit, put it in the GSM shield (granted not an official Arduino one...) and it works fine. When it can find a network signal that is!
144  Using Arduino / Sensors / Re: How to set up RTC module? on: February 25, 2014, 04:55:42 pm
Why? If you get it working then you'll become the expert on the subject!  smiley-grin
145  Using Arduino / LEDs and Multiplexing / Re: Simultaneous Functions on: February 25, 2014, 04:38:10 pm
If you are going to take someone else's (non trivial) code then it's courtesy to leave their name in it. Unless, of course, you are trying to pass it off as your own?
146  Using Arduino / Networking, Protocols, and Devices / Re: Receive and answer SIM900 GSM on: February 25, 2014, 03:02:37 pm
Well I don't know which one you have, but for instance this page has lots of transferable information:
147  Using Arduino / Programming Questions / Re: DS1307 RTC UNO sample code, set time HOWTO use with serial on: February 19, 2014, 03:59:24 pm
Which RTC library are you using?
148  Community / Bar Sport / Re: Chip off the old chip! on: February 18, 2014, 05:21:08 pm
Nice one. You must be chuffed!
149  Community / Bar Sport / Re: Famous Italian "exports" on: February 18, 2014, 05:19:55 pm
Leonardo da Vinci?

And if not him, then his paintings - Mona Lisa... (it's in Paris, doesn't that count as export?)

Failing that, a bottle of Orvieto followed by a bottle or three of Nastro Azzuro (made by, but not Peroni!)
150  Using Arduino / Programming Questions / Re: How to construct this program on: February 16, 2014, 06:10:53 pm
I've not tried the program but from a cursory inspection it's just a decoder. You point the ir transmitter at the receiver and it will display on screen the code being transmitted.
Pages: 1 ... 8 9 [10] 11 12 ... 32