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1  Using Arduino / Storage / Re: EEPROM question on: March 23, 2014, 05:32:45 pm
Might be a little late smiley but we've added an external EEPROM to our new EtherTen/EtherMega boards specifically for storing the MAC address:
2  Using Arduino / Displays / Re: OLED 128x128 plz help on: February 16, 2014, 06:53:29 pm
I have one of the OLED displays and I'm trying to get it to display something    anything really .....
I am trying the examples from the library it compiles and uploads fine but just nothing shows on the screen its puzzling me as to why
I've tried it on an arduino mega 2560 and also an eleven  with no luck
I'm using 1.0.5 of the arduino software and I'm pretty sure i put the library in right but still just cant get anything to come up im connecting it up as the freetronics site says just for the OLED not worrying about the sd slot as of yet
my aim is to start off just making a clock out of it and add more bits in later currently is just a display to show of in the shop at work

any help or some "bare minimum" code would be much appreciated as I'm starting to think maybe i got a dud screen

If you have the Freetronics OLED there's a guide which includes wiring for the display and card socket here:

After wiring it to your Eleven as per the guide, and the display still doesn't work please email to organise a replacement.
3  Topics / Education and Teaching / Using Arduino-compatible boards as external programmers on: February 02, 2014, 09:40:29 pm
4  Using Arduino / Microcontrollers / Re: Multiple Shields on Arduino MEGA 2560 R3 on: January 03, 2014, 11:23:43 pm
For the record a good resource for comparing shield pin use is
5  Using Arduino / Motors, Mechanics, and Power / Re: Ardumoto not working on: December 31, 2013, 09:18:54 pm
Voltage at output point ? SFA would be about it. 16 V at Vin on the Ardumoto

Double-check your shield's header pin soldering for shorts, and also reduce the Vin to <12V. Max Vin for an Eleven is 12V:
6  Using Arduino / Motors, Mechanics, and Power / Re: Ardumoto not working on: December 31, 2013, 09:01:44 pm
Can you measure the voltage coming from the motor output terminals on the shield? If so, what voltage is there?
7  Using Arduino / Audio / Re: Sparkfun MP3 Player Shield Compatability Problem on: December 20, 2013, 12:39:59 am
Thanks Johnft, we must have either cross-posted or my meaning in my last reply wasn't clear. To alleviate the Pin conflicts I won't be using the LCD in the Stack.

No worries. Good luck with the project, sounds interesting smiley
8  Using Arduino / Audio / Re: Sparkfun MP3 Player Shield Compatability Problem on: December 19, 2013, 11:32:51 pm
First Post on the Arduino Forum , so no Flames please 8-)

I have a Sparkfun MP3 Player Shield and have downloaded the required Library.
On the WebPage for this Shield, it is stated that the Pin Layout on the Shield does not match the Pin Layout of the Arduino Board and requires re-mapping.
The WebPage states that a line of Code in the SD2Pinmap.h File needs to be changed from SS_Pin = 10; to SS_Pin = 9:
Looking into the Library Folder, there appears to be no SD2Pinmap.h File to modify!
Does this mean that the SD2Pinmap.h File has been superceded and the Website needs updating or is there another explanation?

My requirements are to operate a Model Railway Layout using this configuration;

Arduino Mega 2560R2
Freetronics Relay 8 Shield
Freetronics 16X2 LCD Shield
Sparkfun MP3 Player Shield

I know that I will end up with various Pin conflicts, (which is why I purchased the Mega), so I'm getting each Shield up & running separately and then attempting to remap the Pins and combine the Code later.

Any help is appreciated.

The MP3 player shield will definitely need manual rewiring, according to the schematic it also uses D6~D9 which will interfere with your LCD Keypad Shield.
9  Community / Products and Services / Re: New - IRTEMP: IR Temperature Sensor Module on: November 07, 2013, 03:34:08 pm
Which board is to be used with this sensor.
I wish to light a LED at a specific temp ?
thank you

Uno, Mega, Duemilanove, etc is fine - more information here:
10  Using Arduino / Microcontrollers / Re: Arduino Compatible(Eleven) on: October 23, 2013, 04:00:38 pm
From Jaycar. same where I bought the Eleven. Shouldn't it suppose to be just replace the chip in and it will work?

Yes it should. You can return the chip to Jaycar for an exchange or email for a replacement.
11  Using Arduino / Project Guidance / Re: Trimpot output to I2c on: October 19, 2013, 02:25:46 am
HI, I am a newbie and do apologize in advance if I sound stupid.
I have recently purchased Freetronics "Eleven" board and 8 channel relay shield.

I would like to switch them on and off sequentially and control the speed via the Trimpot.
Is it possible and what would be the best way to go about?

Thanks in advance

We have a tutorial that shows how to turn each relay channel on and off in the RELAY8: quickstart guide:

Please disregard the sketch in crossroads' post. Below is a quick sketch for you that takes the reading from analogue pin zero (which is connected to the centre pin of your trimpot. with the others going to 5V and GND) and uses the value as the delay between the sequential switching.
You can always add some code after reading the value for analogue pin zero to increase/decrease the delay period.

#include "Wire.h"
#define I2C_ADDR  0x20  // 0x20 is the address with all jumpers removed

int trimpot;

void setup()
  Wire.begin(); // Wake up I2C bus

  // Set I/O bank A to outputs
  Wire.write(0x00); // IODIRA register
  Wire.write(0x00); // Set all of bank A to outputs

void loop()

void sendValueToLatch(int latchValue)
  Wire.write(0x12);        // Select GPIOA
  Wire.write(latchValue);  // Send value to bank A
12  Using Arduino / Motors, Mechanics, and Power / Re: Basic Motor help (With motor shield) on: September 06, 2013, 12:22:16 am
Sorry, it's a 2-Channel H-Bridge Motor Driver Shield by freetronics.

Hi  zhongyan

You can't power the motor shield and board directly from USB.
If you're trying to run the whole lot from that 9V battery - check the voltage, as others have said the voltage drop through the IC won't help (and that battery won't last long either!)
For more see -
13  Community / Products and Services / New - 128x128 Pixel OLED Module for Arduino on: September 03, 2013, 11:43:57 pm
We're pleased to announce our new 128 x 128 pixel OLED module suitable for Arduino (and Raspberry Pi). With a 1.5" diagonal display and thousands of colours, it's perfect for all sorts of display requirements.
Furthermore there's complete support including libraries and getting started tutorials.
For more information please visit -
14  Community / Products and Services / New - Goldilocks: Arduino Compatible with ATmega1284P MCU on: August 25, 2013, 11:55:23 pm
For those who missed out on getting a Goldilocks board in the initial round of crowdfunding -
We now have a small amount available for direct sale -
Furthermore for Q&A, support and more see our Goldilocks support sub-forum -
15  Topics / Science and Measurement / Re: O Scope recomendation on: August 19, 2013, 12:20:14 am
What is your budget?
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