3servos_and_more.txt

glui sensor workshop @ tesla - berlin 2007

(für Wiki Neulinge - so editert man's)

Dienstag 24.4.07

Einführung:

signal flow from physical to virtual domain

analog-to-digital conversion

Analoge Sensoren:

Resistive Sensoren (Biegung + Druck)

Sensor-Interface

Mittwoch 25.4.07

RC-Filter:

How to connect a IR distance sensor:

+ = Supply; T = Ground; S = Input

Pins of Hall Sensor:

Verstärker:

Operating Amplifier with Dual and Single Supply.

Single Supply requires virtual ground.

Too much amplification results in a sensor that is very sensitive where movements result in an overly high voltage that is clipped.

Donnerstag 26.4.07

Digitale Sensoren:

Encoder: dual pulse train. Count pulses for angular increments. Look at phase relationship to get direction

Button/Switch: use pull-up or pull-down resistors

IR-Lichtschranke:

Motor mit Optokoppler:

Some sensor and motor images from the previous days

Freitag 27.4.07

New firmware for PWM @ 50Hz - for pins 9 and 10 (doesn't work with 8 Chip)

Servo Motors are controlled by PWM too, but there the pulse width doesn't control the speed of the motor. Instead it defines a position that the internal control loop tries to reach and then to maintain. Not the full range of pulse width is used but only 5-20% (roughly, depends a bit on the servo)

Using the arduino as standalone version with a servo (code for the ide): arduino_standalone_servo.txt

Stepper Motors:

Standalone version for the arduino using 3 (perhaps even more servos).

So this about setting the second timer to 50hz for the third servo. This timer controlls output 5.

3servos_and_more.txt

Post-Processing/Software Strategies

Projektspezifische Arbeit

Samstag 28.4.07

Projektspezifische Arbeit

20:30 Präsentation

Kontakte der Teilnehmer