Imagine that you want to have a kind of "automated control" for a trolley (i.e. a golf trolley). What kind of automation system would you use?

The basic requirements would be the follwoing ones:

- Trolley is stopped, you push it and it starts due to the force of the push.

- The trolley accelerates in order to reach the speed at which you're walking.

- When the trolley is having the same speed than the person walking behind it the force on the trolley handle is almost nul and the trolley runs at this speed.

Hi all,

Hi I have problem with reading value from 3 ultrasonic sensor. I use Atmega644P and trig is conected to PD5-PD7, but echo from all sensors conected to PD2. I tried read value and wrote to LCD. When I disconnected all sensors the some values are on LCD, but when I connected all sensors and click to reset the LCD is clear.

I've got two sets of phototransistors and infrared emitters put together to make two IR distance sensors. They are both connected in the same way, both powered by my Arduino Uno, both with the same resistor, etc. But when I check the values I'm getting from them, one of them ranges from about 980 - 1010, with the higher value closest to the sensor. The other, however, goes from about 350 - 570, with the higher value the furthest from the sensor.

With a bit of circuitry can this IR phototransistor replace the following sensor? 

IR phototransistor:http://arduino-direct.com/sunshop/index.php?l=product_detail&p=209

Sensor:http://www.robotshop.com/ca/dfrobot-flame-sensor.html

I plan to interface it with an Arduino

For robots that have multiple types of sensors, like adding touch sensors, light sensors, temperature sensors, and a mix, which is easier, Picaxe or Ardunio? Or is there a better microcontroller or setup? I know Lego's NXT has these abilties, but I wanted to know what other setups are out there that work really well or are the easiest to work with or put together.

UPDATE BELOW!

-----------------------------------

I have an idea for a really fantastic little project (IMO :) I'll show it later, but I have run into a little challenge that I did not see when I woke up in the middle of the night with the overal concept crystal clear in my head.

I need a "probe" - a small thin stick - like a long fat needle - to move forward towards an object, and with none, or only a slight touch, register when it touch the object.

Hi,

I want to take my Bliss Robot to the next level of "object avoidance". Please note that I just want the "next level", not the "ultimate level" (yet) ;-)

I got some advice from ignoblegome but I would like to openly ask which would that "next level" may be. I have seen several things out there:

Hey,

Has anyone successfully implemented object detection using IR for a range greater than 5cm. I am building a robot project from scratch with the personal challenge of making all parts homemade. The brainboard and motor controller were succesfully built but now that i want to do object detection using IR (without getting the sharpe module) I have issues with ambient lighting and range.

hay guys me again!

just wondering what the pros and cons of both of these sensors are and the one i should use in my first project.

Playing around with a small project, of a time-lapse-recording that should track a cloud in the sky, I got to think of Pinhole cameras - and I was thinking if any one had tried to play with the technique

For some time now ive been trying to get m sharp ir sensor to work with my arduino.
its all plugged in and fine but no matter what is infront of it the data will keep bouncing around 1000.

................................................................................................

Honeywell's datasheet on the HMC6343 compass states that tilt compensation is made using data from a built-in three axis accelerometer. I thought that a cheaper three-axis magnetometer- accelerometer combination is much more reasonable for small scale projects, so my question is: What kind of calculations do I need to perform to get a decent degree of accuracy?