This is an old revision of the document!
During the 2018 season, we hand-wired a little board to break out and debug the Digital I/O wiring to the break-beam sensor. This project is about a PC Board to replace that, and for other DIO testing and wiring.
* Review DIO (Digital I/O) in the roborio digital IO section.
Here's a perfboard prototype and a sketch of what we're building (click for a bigger image):
We might or might not include the test button.
What's on this board:
- Connectors
- * Female 3-pin socket for cable to RoboRIO
- * Male 3-pin header to connect to switch, device, or sensor.
- Yellow LED indicates that power is present on the DIO cable. This is an instance of a Basic LED circuit
- Red LED lights when the signal is “low”, perhaps because it has been connected to ground by a switch or sensor. This is a slight variant on the Basic LED circuit
Not on the prototype, but hinted on the shematic: additional male headers. The break-beam sensor needs two things wired up: the source and the detector. Sometimes we won't install the actual headers, but will just solder individual wires into the holes - but we can still use the same fabricated board blank.
Schematic
Before reading this section and studying the DIO tester schematic, you might want to review:
- Introduction to Electrical Schematics