12 replies to this topic

[chevi99]

i basically want to develop an obstacle detector. Which netduino board will suit ma goal. i will also be using an ultrasonic laser sensor to inspect the environment for obstacles, will also use and LCD display message and also be needing a sound output too. Pls help!!

[Paul Newton]

Hi - Welcome to the Forums,

 

I am using some analogue sensors from Sharp which use Infra-red light to give distances between 10cm and 80cm.

I am also using some digital Sharp sensors that just detect the presence of an object close by.

 

Both of these type of sensor are connected directly to the Netduino with a single input pin (analogue or digital as appropriate),

they work well for me on the Netduino plus (v1).

 

Since all they need is the normal IO pins I think any classic (not Go) Netduino should work straight out of the box.

 

This page has a link to the sensors - http://forums.netdui...4-dfrobot-buggy

 

Hope this helps - Paul

[beastyboy]

Paul,

 

I think the GO with a Shieldbase could easily achieve the same, maybe not as cheap but definitely doable.

 

Cheers Olaf

[Paul Newton]

Paul,

 

I think the GO with a Shieldbase could easily achieve the same, maybe not as cheap but definitely doable.

 

Cheers Olaf

Yes I agree - Go plus shield base would work fine.

Choice probably depends on final form of the project and price.

Paul

[chevi99]

i have purchased the netduino 2 and also an lcd from sparkfun and hc-sr04 sensor. but the problem is both the lcd and the sensor requires 5v i can't make them work at the same time. how do i get them to work simultaneously. that is the dislpay should show distance.

[jrlyman3]

If you're saying that you haven't been able to hook up both the LCD and the sensor because there is only one socket on the shield connector for 5V, then I've had the same problem.  My solution was to create a couple "Y" cables.  They allow me to connect multiple devices to the 5V, 3.3V and/or GND pins.

 

If that;s not what you're saying ... then say more ...

 

John

[chevi99]

If you're saying that you haven't been able to hook up both the LCD and the sensor because there is only one socket on the shield connector for 5V, then I've had the same problem.  My solution was to create a couple "Y" cables.  They allow me to connect multiple devices to the 5V, 3.3V and/or GND pins.

 

If that;s not what you're saying ... then say more ...

 

John

yes john exactly. So are u saying if i create a "Y" cable my problem will be solved. So how do i go about this? is it difficult to make one?

Chevi99

[jrlyman3]

I like to use "breadboard jumper wires".  They come in M/F, F/F, and even M/M configurations.  You can get them from a bunch of vendors on Amazon for a few dollars.  One way to do a "Y" cable would be to cut a couple M/F cables in half, strip the ends, twist them together, solder it together, and shrink wrap it.  Use one male end (to plug into the Netduino) and 2 or more female ends to receive the wires from your devices.

 

Another way that I've done it is to solder a jumper wire with a male end to a piece of female header with 3 or 4 sockets.  Solder all the pins together and put some shrink wrap on it if you want.

 

Do you have a soldering iron?  I took a quick look on Amazon and I don't see any premade jumpers.

 

John

[sfx]

John,

 

This is a great idea! I've thought about how to do this myself, but your idea of using headers sounds like the cheapest and simplest approach I've heard. Nice work!

 

However, can I ask what you mean by "shrink wrap"? Are you referring to electrical tape, or something else?

 

Nathan

[chevi99]

I like to use "breadboard jumper wires".  They come in M/F, F/F, and even M/M configurations.  You can get them from a bunch of vendors on Amazon for a few dollars.  One way to do a "Y" cable would be to cut a couple M/F cables in half, strip the ends, twist them together, solder it together, and shrink wrap it.  Use one male end (to plug into the Netduino) and 2 or more female ends to receive the wires from your devices.

 

Another way that I've done it is to solder a jumper wire with a male end to a piece of female header with 3 or 4 sockets.  Solder all the pins together and put some shrink wrap on it if you want.

 

Do you have a soldering iron?  I took a quick look on Amazon and I don't see any premade jumpers.

 

John

Great idea John i've been abel to create my own Y cable i just took 3 male jumper wires twisted the ends together and amazingly it worked

tnx for the idea

chef

[chevi99]

can i make my speaker give a warning message like "WARNING OBSTACLE AHEAD" i know about making musical beats but is there a way a computer voice will speak rather than beep?

[beastyboy]

There some mp3 modules on the market you could use for that.

[zei0]

Paul,

 

I think the GO with a Shieldbase could easily achieve the same, maybe not as cheap but definitely doable.

 

Cheers Olaf