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16  Topics / Robotics / Re: Dagu Rover 5 chassis robot demo on: January 18, 2014, 07:25:03 am
Dagu is now selling a new kit that fits on top of the Rover 5 chassis: the service droid. I got an early version and just started playing with it. At the moment it's remote controlled by another Arduino through nRF24L01 modules. But I will add a raspberry pi and camera and try to do some autonomous stuff.
17  Using Arduino / Motors, Mechanics, and Power / Re: Controll a stepper motor over the TfT Touchscreen on: January 15, 2014, 07:28:11 am
The technical details of the TFT show that digital pins 2, 3, 5, 6, 7 and analog pins 0-5 can still be used. I think the only way of connecting something to those pins is soldering wires to the pins on the bottom of the Arduino.
18  Using Arduino / Project Guidance / Re: Building a 2 WD Arduino controlled Robot. on: January 14, 2014, 08:48:13 am
Take a look at Ken Shirriff's IR library:

19  Using Arduino / Motors, Mechanics, and Power / Re: TIP120 on Arduino on: January 14, 2014, 07:27:34 am
If you want to switch the positive side you must use a PNP transistor. For example a TIP127.
20  Using Arduino / Motors, Mechanics, and Power / Re: L298N Motor Module on: January 12, 2014, 09:15:57 am

Because the A4988 is a stepper driver, it's not made to control DC motors but stepper motors.
21  Using Arduino / Project Guidance / Re: Can I use an Arduino in my project on: January 12, 2014, 07:26:57 am
There is an Arduino modbus library:
Only the Arduino Due (32bit Arm micro controller) has 2 analog outputs (12bit). The Due also has 12 analog inputs with 12 bit resolution. Other Arduinos (AVR based) only have pwm outputs and 10bit analog inputs.  So you would need additional hardware to accomplish what you want.
Bluetooth is pretty easy to accomplish, you can buy a bluetooth shield or just connect a bluetooth module to your Arduino. Programming them is pretty straight forward as it's just serial communication.
22  Community / Products and Services / Re: Are there any products that include Bluetooth? on: January 09, 2014, 04:35:28 pm
I've used a cheap HC05 bluetooth module that I bought on Ebay to control a robot:
23  Community / Products and Services / Re: Are there any products that include Bluetooth? on: January 06, 2014, 01:30:54 pm
The Arduino BT has bluetooth onboard:
But I'm not sure if it is still being made?
24  Using Arduino / Project Guidance / Re: which arduino board should i buy? on: January 02, 2014, 04:40:54 pm
The Arduino starter kit includes an Arduino Uno:
25  Using Arduino / Networking, Protocols, and Devices / Re: rf2401 problem with mega 2560 on: December 19, 2013, 03:37:33 am
I have absolutely no problems with the RF24 library and Arduino 1.0.5 IDE. Compiles without errors on my system. You sure that you have installed the right way?
26  Using Arduino / General Electronics / Re: nRF24L01 wireless communication on: December 02, 2013, 04:04:39 pm
From my experience you will only get a range of 1km with 2 modules with PA+LNA . And you will need to use the slowest speed (250KBPS) and have a line of sight between the 2 modules. There is a reason they are cheap smiley
27  Topics / Robotics / Re: ArduinoRobot.h and Wire.h on: December 01, 2013, 06:26:12 am
The ArduinoRobot.h library already includes the wire library:
28  Using Arduino / Motors, Mechanics, and Power / Re: DC 5V 28YBJ-48 Stepper Motor Question on: November 30, 2013, 05:34:07 pm
Those motors can be used for a robot, but it will be a slow robot...  I've done it smiley

I was using a 3S Lipo (+-12V), makes the motors run pretty hot. I haven't killed them yet. They are dirt cheap so can take the risk smiley
I did need to write code to slowly ramp up the speed else I could not let them run that fast.  And I used 2 74HC595 shift registers to control the 4 ULN2003 boards. So I only needed 3 pins to control the 4 steppers  smiley-grin
29  Using Arduino / Networking, Protocols, and Devices / Re: RF24: one loop takes 30ms :( on: November 24, 2013, 05:32:19 am
I just tried using radio.setDataRate(RF24_2MBPS); and that does speed things up. Still not as fast as I want but maybe that's the limit of the hardware (and my lack of coding skills :p ). Should have tried this a long time ago  smiley-red
30  Using Arduino / Networking, Protocols, and Devices / Re: RF24: one loop takes 30ms :( on: November 24, 2013, 05:02:22 am
When running the test sketches I have zero packet loss. I'm using modules with amp and preamp, each powered by its own 3V3 regulator and a 100µF electrolytic and a 0.1µF ceramic capacitor on the output of the vreg. I don't think that's the problem...
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