ldr

I hope you can help me - I¨m sure it's not too complicated, I just know yet how to ask my Arduino to read it. 

So, I'm playing peek-a-boo with my robot (arduino, light sensor and a motor)

and I need to tell my arduino to read that:

If the value of the LDR (which is usually around 600) goes below 100 (for more than 2 sec) and then above 400, it should trigger the motor. 

Thanks a bunch, 

I have built my first robot after advice of  LMR start here. So my robot is navigating with help of IR sensor and has those standard geared motors.

 I'm wondering if picaxe can read information from motors if the robot gets stuck. I guess motor makes some noise in such a situation?Can pushing against some obstacle with rubberwheels on harm picaxe?

I would be grateful for any piece of advice!

Hello,

I would like to know if the PIC12F675 from microchip can control 2 LDRs, a buzzer, and a LED. I know it might sound a simple question but this is for my starting project with Microchip and C programming.

If it is possible I would appreciate if someone could tell me how to wire the components to the PIC.

Thanks, GranTotem

:D

Hi, well got my robot to follow light, to see if everything was working fine, but the weird thing is, instead of changing direction in real time, it only changes direction when i reset my arduino board, same thing happens if i watch the serial monitor.

for example

it prints out 500 to the serial monitor

keeps printing 500, even if i change the light source.

Hey i plan to make a robot that has no brains at all. but the LDR's are not working! they were working in the previous appliance (outdoor light) but not now with a battery,motor and an LDR and it won't work! here is the schematic for my robot.

                                                                        Can you please tell me what is wrong!

Hey everybody. I am a long time lurker on this site and I would like to thank you all for all the valuable information here. I have built a start here bot and a few more complex things of my own. Now I am trying to build a very small sized robot with a picaxe 08m.

I am a beginner in electronics. I know how to hook up a LDR and read the input, but I would like to know if there is a possibilty to hook up 2 to 1 input. The problem is I am short 1 input on my robot and all the other picaxe pins are in use. The 2 ldrs would be used as left and right eyes in a sense.

The other day I found this in our local garbage dump:

I have been trying to figure out its wiring diagram using a multimeter.

hello folks..

i took a look at the easy aurdino robot using LDR found at this location 

http://letsmakerobots.com/node/2164

i am making the same using AT89S52 controller. I wanted to ask how is can I interface the LDR using ADC 0808. I mean what clock frequency should i be using and how. Also how can i implement turning of the chasis without jerks.

I am turning the chasis by stopping one motor and letting the other run.

Ahoy me hearties!

I'm working on a bot that will have a lot of sensor requirements. It must be able to sense objects both at the top and the bottom of the frame. Since I don't want to have to keep track of 8+ sensors, I was hoping to combine some of the sensor inputs.

For example, the bot will react the same to an object sensed at the bottom as one at the top, can I combine them?

Will this schematic work? And if so, will the adc reading be a sum of both sensors, or merely the highest one?