LDR sensor

wafa86

Hi every body

I need your help in LDR sensor, I want to write a code on LDR and I need to read the value of lightness that the LDR sense and send it vai bluetooth, the problem is when I make serin to the LDR it take a value and cannot be uderstood, so it transmited vai bluetooth in rabish value. how can I use the basic stamp to convert the value of LDR into ASCII code and transmitted vai bluetooth?????

thank u

Franklin

Could you post links to the parts you are talking about. A LDR is a resistor, perhaps the sensor you are referencing has other parts that outputs serial but I don't know.

wafa86

I know the LDR is a resistor but it job in my circuit is to sense the light, I want to send the amount of light that it is sensing by convert this amount to ascii code and send it to the bluetooth how to do such a thing?

PJAllen

Using an "LDR" is covered in PBASIC Help under RCTIME and sending the value/result is covered in PBASIC Help under SEROUT.

Post Edit -- There is more information on LDR'ing in "Stampworks", too.

oscarkorner

There are two issues here:
- the amount reflected back to the LDR will also depend on the particulars of the object (meaning you can't accurately determine distance for an arbitrary object)
- background noise... there are some simple ways to get around this that I can tell you if you want.

If you are serious about measuring distance I would suggest ultrasound. It is also possible to do this with light but short distances are very difficult due to the high speed of light.

Moskog

oscarkorner said

If you are serious about measuring distance I would suggest ultrasound...

Where did this distance issue come in here?