Have a question on Arduino? Ask our expert Simon Monk

I am converting my remote controlled golf cart to follow me on golf course.

It is exactly like the build that Benjamin Heck did on episode 38, Robo luggage.

I already have Adruino uno, transducers and receivers and Mosef. I am a

automotive technician for 20 years now. But new to putting electronics together

and coding. Any help on the build would be greatly appreciated. Carl

I need to know how to interface with an ultrasonic sound sensor and the program to write to use it in Arduino Uno.

i want to build a robotic car, can you give me any ideas?

thank you.

how to use the uln 2003 darlington transistor array?

To use the ULN2003 (http://www.ti.com/product/uln2003a) you will drive the inputs (1 - 7) with a digital line from Arduino or other MCU.  Matching output pins will interface with hi voltage/current device.  Pin 8 is ground (DC).  Pin 9 is a Test/Turn on ALL pin.  THis must be left floating (No connect) or pulled HI. or connect to a pull up and toggle with a digital pin or pushbutton to ground.  Be aware of the current limitations of each channel and entire package.  If you need more current draw than one channel can handle, you can tie two or more port together.

Regards,

Dave M.

Hi Shelton,

I bought an HC-SR04 ultrasonic sound sensor off eBay a while back and found that I could just connect up the lines (gnd=gnd, vcc=5v, trig=D12 and echo=D13) and run the demo. super easy. I think the listing included a link to download the library.

Here is a place to buy it too, and they include a link to the library, as well as a bit of an explanation: http://letsmakerobots.com/node/30209

Cheers,

-Nico

Any question that starts 'what is' probably just needs a trip to Wikipedia

As far as shift registers go, a common usage with an Arduino is to have a serial-in-parallel out shift register to drive lots of LEDs.

See this: http://www.codeproject.com/Articles/144606/Arduino-Platform-Working-with-Shift-Registers

how about I start off with a simple line following robot?

what do i need to know to make one?

Hi Shelton,

I noticed that you can buy a line follower sensor on eBay: http://www.ebay.ca/itm/Arduino-Infrared-Line-Track-Follower-Sensor-Shield-/200659792466?pt=LH_DefaultDomain_0&hash=item2eb8417252

You can probably buy similar things in many other places too.

You would still need the basic drivable base, which can be bought in kits as well, or you can hack a remote controlled toy car, which is often a lot more affordable.

Here is someone who did that: http://www.instructables.com/id/Arduino-motor-drives-cheap-toy-car/

I bought a toy RC Hummer a few months ago for just 9 bucks for exactly that reason

So maybe step one could be to get an Arduino controlled car going. You could even just follow that instructable to get to that point. And then add the line following bit.

Good luck, hope it goes well. post some pictures

Cheers,

-Nico

I actually live in India so these are worth a lot of cash,for the price of one line follower sensor i could byy an arduino so are there any ways to make it cheaper??

like build it using ldrs and leds?

btw what is a flip-flop in computer terms?

A Flip Flop is a IC (Chip) that will have two states for a given input.  When toggled, the output pins will trade states or Flip Flop states. Switch from hi to lo or one to zero, and vice versa.

Hi Shelton,

Yes, it should be possible to build your own.

This blog shows details on what they did to make a line following robot, and includes a diagram of how the sensor works, with a circuit diagram.

http://www.ermicro.com/blog/?p=1097

Hope that helps

Cheers,

-Nico

Hi Shelton,

Yes, it should be possible to build your own.

This blog shows details on what they did to make a line following robot, and includes a diagram of how the sensor works, with a circuit diagram.

http://www.ermicro.com/blog/?p=1097

Hope that helps

Cheers,

-Nico

thanks a lot !!

i also have an arduino, can it be used to make a line followin robot??

an arduino uno