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1  Community / Exhibition / Gallery / Re: Simple Generic Nikon IR Hack. on: September 12, 2014, 02:49:03 pm
For information I updated this with some code so The Nikon now triggered by an SRF05 sensor.

2  Community / Exhibition / Gallery / Simple Generic Nikon IR Hack. on: September 09, 2014, 11:40:11 am
I modified a generic Nikon IR camera trigger. I want to use an Arduino to make this work so I can attach sensors and / or bluetooth communication. Bluetooth has significant advantages over IR. It works over greater distances in strong sunlight and through obstructions such as walls, vegetation etc... I posted the information here as it is an ongoing project to develop Arduino controls for my Nikon camera. (my specific camera is D5100).

3  Community / Bar Sport / What is a Gandalf circuit? on: January 05, 2014, 08:22:24 am
Evil power spikes, you shall not pass!  I was trying to explain to a beginner what  flyback and snubbers do and he said "yeah it's a Gandalf circuit, cool " So now we refer to them as that. Maybe it's not accurate but it helped him.
4  Using Arduino / Installation & Troubleshooting / FTDI cable works 1n Arduino 022 not in Arduino 1.0.5 [SOLVED] on: November 02, 2013, 07:54:36 am
error is
avrdude: stk500_getsync(): not in sync: resp=0x00

I'm using windows Vista with Arduino 1.0.5 on an Uno rev3. My problem is the FTDI cable works 1n Arduino 022 not in Arduino 1.0.5. I have updated the bootloader using optiboot in the 1.0.5 folder (using ICSP and AVR studio 4) Used the latest drivers from the makers website for the cable. By the way it works fine with an ordinary USB cable via the Arduino board's USB socket. I checked the Arduino trouble shooting section but no joy.

Can anyone please offer help for the problem?

Many thanks.

I played around more with this I got it working.
1. Copy old FTDI drivers from Arduino 022 to Arduino 1.0.5 and
manually get windows to install those for the FTDI
in System/ Device manager  (requires restart of Windows)

2. Start Arduino 1.0.5 and disconnect the FTDI cables reset
wire / pin so it is not connected to the reset pin on the
Uno board (I left it floating - maybe bad practice )

3. Upload the sketch, look for progress text. As soon as Uploading... appears
press the reset button. It should "Upload" successfully now.
Tip: hover your finger over the button to be very precise with timing.
5  Using Arduino / General Electronics / Re: I don't understand relays on: July 19, 2013, 10:17:03 am

There is a diagram and a video on the above page that may help explain how some relays work. It's a DC example but you wire the AC circuit the same way.

Here is another

6  Topics / Robotics / Re: What's next after Arduino? on: June 21, 2013, 04:19:00 am
I am also a beginner in Robotics but I've used Arduino for a while now.

I think you can do a lot more with Arduino type boards. I've started a project which sounds similar to what you suggest. A connection between smart phone / tablet  and an arduino controlled robot over bluetooth. I'm using the mega2560 board.

I'm sharing the project here as it develops: . It's very raw at the moment but I have made some progress and posted code and hardware designs.

7  Using Arduino / General Electronics / Re: N-MOSFET, PWM and DPDT to control speed and direction of Motor on: May 27, 2013, 07:55:47 am

I settled for this DPDT relay design and a X4 config of my mosfet circuit on perf-board see attached pics. Also with the higher freq PWM.

8  Using Arduino / General Electronics / Re: N-MOSFET, PWM and DPDT to control speed and direction of Motor on: May 23, 2013, 07:27:53 am

I used this code from the playground and it works fine = Lot  Less noisy PWM

TCCR2B = TCCR2B & 0b11111000 | 0x01;
//sets Arduino Mega's pin 10 and 9 to frequency 31250.

9  Using Arduino / General Electronics / Re: N-MOSFET, PWM and DPDT to control speed and direction of Motor on: May 23, 2013, 05:13:23 am
Coding Badly- I'll probably use pin 10 on the mega2560.

also thanks MarkT and afremont for the tips about the switching tranny and snubber. At the mo, I'm only using a couple of amps @12vdc, but I want have these scalable so in future I can use larger currents so snubbers will be needed then.
10  Using Arduino / General Electronics / Re: N-MOSFET, PWM and DPDT to control speed and direction of Motor on: May 22, 2013, 04:37:00 am
Coding Badly - Thanks for clearing up the singing thing.

 I'm using the arduino mega2560 I looked here for tips on altering frequency, but it looks advanced for an intermediate like me. Is there an easier way? I wonder if anyone wrote a library that does the register stuff in the background and I can just do something like

#include <lazyPWM.h>

setPWMfreq(int Hz);//

smiley although I guess I learn more playing directly with the timers.
11  Using Arduino / General Electronics / N-MOSFET, PWM and DPDT to control speed and direction of Motor on: May 22, 2013, 03:39:29 am

I'm making a small robotic car and designed this circuit on a simulator [attached]. It also works in real life, I get direction and speed control. However I have read many times on this forum that just because a circuit works doesn't mean it's a good design. Also the PWM makes it "sing" which I found a bit worrying - maybe it's normal?

Is this design reasonable and safe, and how could I improve it?

The MOSFET is a logic level type and is activated when 5v is applied to the gate. When the logic PIN of arduino is 5v it goes one way and logic 0 causes the DPDT relay to switch over and the motor goes the other.

12  Community / Exhibition / Gallery / Re: Relaxino on: May 09, 2013, 08:10:40 am
I thought I should post an update to this thread. I have written a beta Android app to work with this project over bluetooth. See where all the code is listed for free and instructions given, all open source. The beta App is also on google play

I hope it's useful. If you use it please link back to my blog.


edit: It doesn't have any adverts on in-app nags either.
13  Using Arduino / Sensors / Heart Talks To Brain, Thru Arduino, Via an android on: April 10, 2013, 03:09:11 pm
Pardon for the silly title.

Arduino heart sensor Beta project.

Currently using Grove heart rate sensor (Seeduino), Uno R3, BT blue smirf gold. Need to miniturise and reduce costs. Cost of android not applicable - best ideas appreciated.
Arduino code very simple


14  Topics / Science and Measurement / Re: eye blinking in Neurosky with Arduino on: February 28, 2013, 09:51:07 am
Try these links.


Arduino BT:


Robot Cntrolled by Mind:

Good luck
15  Topics / Robotics / Re: I need YOUR ideas!! on: February 28, 2013, 09:40:18 am
Have a look at this link: It would be nice to make it to do something useful. Apparently it's very robust - even pet and water proof!

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