Search found 8 matches

by richardv2
Mon May 12, 2008 8:36 pm
Forum: Robotics
Topic: Robot Line Sensor Question
Replies: 5
Views: 3155

Robot Line Sensor Question

I want to signal condition a phototransistor line sensor output to a digital input. Although I am using the PIC16F8680 chip, the answer should be valid for most PIC chips. If not, please let me know. I have designed, built and tested a bank of 8 IR Transmitter/ Phototransistor pairs. They all return...
by richardv2
Fri Mar 07, 2008 12:00 pm
Forum: Robotics
Topic: Line Following Sensor Arrangement Algorithm
Replies: 7
Views: 7399

If you do a analog setup... inputs would need to go into the analog port of a micro. In my picture above I have the optic sensor in the middle of 4 bight LED's.. the sensor is shielded with ducktape so the sensor needs to see the light being bounced from the ground. When I was testing my sensors, I...
by richardv2
Wed Mar 05, 2008 4:35 pm
Forum: Robotics
Topic: Line Following Sensor Arrangement Algorithm
Replies: 7
Views: 7399

So how does an analog line follower work?
by richardv2
Sun Mar 02, 2008 6:52 pm
Forum: Robotics
Topic: Line Following Sensor Arrangement Algorithm
Replies: 7
Views: 7399

Line Following Sensor Arrangement Algorithm

I'm building several line following sensor arrays. One is an 8-inline array with QRD1114 sensors spaced at 0.5 inches. The 'line' will be 0.75 inch electrical tape. I want a more precise reading, so closer spacing, allowing two sensors to react when both are over the line, will give me more readings...
by richardv2
Mon Jan 28, 2008 10:27 pm
Forum: Robotics
Topic: How Much Current for Line-Following Sensor QRD1114??
Replies: 2
Views: 2579

How Much Current for Line-Following Sensor QRD1114??

So I ordered a bunch of QRD1114's for a line-following robot to use as black/white sensors. Most schematics I've ever seen put a 270 ohm or 330 ohm current limiting resistor in a (regulated) 5-volt setup. So my math would be: I = E / R = 5v / 270 ohms = 18.5 ma and I = E / R = 5v / 330 ohms = 15.1 m...
by richardv2
Thu Jan 24, 2008 7:27 pm
Forum: Robotics
Topic: Motor Speed Steering Control or Servo Steering Control?
Replies: 3
Views: 2950

From what I've read, the main reasons for servos are:
Small package
Built in gear box
Good power/weight ratio
Built-in feedback

So for a small (light weight) robot, I would thing servos would be the way to go. I just have no idea at what weight it makes more sense to go with motor control.
by richardv2
Tue Jan 22, 2008 10:21 pm
Forum: Robotics
Topic: Motor Speed Steering Control or Servo Steering Control?
Replies: 3
Views: 2950

Motor Speed Steering Control or Servo Steering Control?

Fast Line-Follower Steering? Motor Speed Steering Control or Servo Steering? I want to build a fast line-follower. I've seen left/right motor only robots where all steering control is in the motors, and I've seen several with a steering servo and sensors out front and the hardware and motors in a tr...
by richardv2
Tue Jan 22, 2008 10:19 pm
Forum: Robotics
Topic: Fast Line-Follower Motor Selection? What to Look For...
Replies: 0
Views: 1714

Fast Line-Follower Motor Selection? What to Look For...

I want to build a fast line-follower. From details I seen through Google, it looks like 1 meter per second is atainable with the right hardware and software. My questions... How do I equate 1 meter per second with a specific motor? I know the math is easy - wheel circumference times RPM can give me ...