Brick - Moduł z fotokomórką, czujnik światła
Moduł z fotokomórką, bardzo prosty czujnik nadający się tylko do stwierdzenia czy światło jest czy go brak, nie nadaje się do dokładnych pomiarów. W zestawie z modułem znajduje się również przewód połączeniowy.
Dodatkowe informacje,schemat oraz sposób podłączenia do Arduino można znaleźć na stronie producenta: http://www.elecfreaks.com/wiki/index.php?title=Octopus_Analog_Photocell_Brick
Zastosowanie:
- czy jest ciemno czy jasno
- czy coś blokuje dostęp światła
- czy coś przerywa wiązkę lasera
What is a photocell?
Photocells are sensors that allow you to detect light. They are small, inexpensive, low-power, easy to use and don't wear out. For that reason they often appear in toys, gadgets and appliances. Theys are are often referred to as CdS cells (they are made of Cadmium-Sulfide), light-dependent resistors (LDR), and photoresistors.
Photocells are basically a resistor that changes its resistive value (in ohms Ω) depending on how much light is shining onto the squiggly face. They are very low cost, easy to get in many sizes and specifications, but are very innacurate. Each photocell sensor will act a little differently than the other, even if they are from the same batch. The variations can be really large, 50% or higher! For this reason, they shouldn't be used to try to determine precise light levels in lux or millicandela. Instead, you can expect to only be able to determine basic light changes
For most light-sentsitive applications like "is it light or dark out", "is there something in front of the sensor (that would block light)", "is there something interrupting a laser beam" (break-beam sensors), or "which of multiple sensors has the most light hitting it", photocells can be a good choice!
