Sharp Digital IR Sensors GP2D15

Scott Portocarrero

Yo Yo Yo

I accidentally bought a digital sharp GP2D15 and it only has three leads coming out! Anybody have experience (code) for this sensor for the BS2

Mike Green

Read the datasheet for the device (do a websearch ... it's there). It just provides a logic high / low output (with a pullup). It works like a switch to ground with a pullup like shown in "What's a Microcontroller?". The datasheet shows the fixed distance where it goes from high to low and back again. Two of the leads are just +5V and ground.

Scott Portocarrero

Hi Mike thanks for the reply

I will try that

Prettybird

·· I happened to use sharp sensors for my mini monster boe bot (completed projects). They are analog output so you may have to convert them. They work great. I used a simple circuit using a LM 339 comparitor ic with a an ajustable input pot to ajust input trigger level. It put out a simple TTL hi low output. The range can be ajustable. I have seen them also use an ADC 0831 8 bit analog to digital convertor chip. The compatitor circiit is in the top left of my Boe bot accessory sketch and the adc convertor is includded in attachments below. Crustcrawlwer has some imfo on using the adc chip in their shareware programs.

Scott Portocarrero

Hey Bird

I am using the D15s not the D12s. The D12 is the same but analog the D15 are digital.

Thanks for the reply

Scott Portocarrero

I guess what my question is:

How do I interface this sensor (which is digital) with the BS2. I have three wires Vcc-5v positive, ground, and Vout. I am using a pull up resistor between Vcc and Vout. I am using pin 15 as my input. I am trying to program it just like the BoeBot IR emitter/receiver but using this sensor instead of a emitter on one pin and a receiver on another pin.

Franklin

Here's the datasheet.www.acroname.com/robotics/parts/SharpGP2D12-15.pdf the output goes high when an object is detected within 10cm of the sensor.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
- Stephen

Scott Portocarrero

I wrote a little program to see if that works and it always stays high

Scott Portocarrero

do you have a test program suggestion

Mike Green

Post your schematic and your test program (as attachments to a message).

Scott Portocarrero

Mike I have no way of getting a schematic to you. I hooked it up exactly the way it says in the documentation with a 10k pull-up resistor. As for programming here it is

Mike Green

You're certainly right about the test program being simple. It should work. The only thing I can imagine is that the sensor is connected wrong (like maybe the pins are backwards).

Scott Portocarrero

thanks Mike I had the Vout and Vcc pins backwards on the molex connector

Mike Green

It's amazing how often that happens.