Light Sensor and LED Display Expansion Module
Sensing |
Actuation |
| • Light Dependent Resistor |
• 5 LEDs |
Description
This expansion module is equipped with a light dependent resistor (LDR)
and five LEDs - green, yellow, orange, and two red. The LDR forms one
half of a voltage divider, the value of which is sampled by one of processing
module's analog channels. All five LEDs are controlled by lines from the
processing module that can be dedicated to pulse-width modulation so as
to vary the intensity of each LED independently.
Schematic Diagram
[PDF]
[Protel]
Printed Circuit Board Layout
[PDF]
[Protel]
Parts List for 100 Pieces
| Vendor | Vendor Part # | Qty. | $/Unit | Description |
| Digikey | 67-1695-1-ND | 200 | $0.19 | Surface mount (1206 package) red LEDs. |
| Digikey | 67-1696-1-ND | 100 | $0.19 | Surface mount (1206 package) orange LEDs. |
| Digikey | 67-1358-1-ND | 100 | $0.27 | Surface mount (1206 package) yellow LEDs. |
| Digikey | 67-1002-1-ND | 100 | $0.21 | Surface mount (1206 package) green LEDs. |
| Digikey | ??? | 500 | ??? | Resistors for use with LEDs. |
| Digikey | ??? | 100 | ??? | Resistor that forms the other half of a voltage divider with the LDR. |
| Radio Shack | 276-1657 | ~20 | ~$2.40 | CDS Photoresistor Multi-Pack, containing an assortment of light dependent resistors. |
| Newark | 33B093 | 100 | $1.85 | FCI/Berg 91900-21125 Conan 25-pin 1mm pitch header for connecting with processing module. |
|
|
|
|
|
|
|
|