SigOS: Hardware: Difference between revisions
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| Line 13: | Line 13: | ||
** Either wire from CdS photoresistor | ** Either wire from CdS photoresistor | ||
** Wire color: Green | ** Wire color: Green | ||
** Function: Variable voltage into GPIO P1 of Control Board A/D converter | ** Function: Variable voltage into GPIO P1 of Control Board A/D converter, voltage is inversely proportional to ambient light level | ||
* Pin 2 | * Pin 2 | ||
** Other wire from CdS photoresistor | ** Other wire from CdS photoresistor | ||
Revision as of 18:18, 5 December 2024
The Signal Operating System is designed to operate on low-cost hardware. This encourages extensive use for Signals and Detectors throughout most railroads, large and small.
Components
Control Board
CdS photoresistor
A CdS photoresistor is a light-sensitive resistor. It detects the ambient light at the signal head, which SigOS uses to control the brightness of the WS281 LEDs.
- Pin 1
- Either wire from CdS photoresistor
- Wire color: Green
- Function: Variable voltage into GPIO P1 of Control Board A/D converter, voltage is inversely proportional to ambient light level
- Pin 2
- Other wire from CdS photoresistor
- Wire color: Yellow
- Function: +3.3 volt power
- Part number: GL5516
- Characteristics: Bright light 5-10k Ohms, dark 0.2M Ohms
- Source: Amazon.com