Differences

This shows you the differences between two versions of the page.

--- 2022_ball_presence_sensors [2023/01/19 22:57] – [First Prototype] tell
+++ 2022_ball_presence_sensors [2023/01/19 23:20] (current) – [Third Version: custom PCB] tell
@@ Line 49: / Line 49: @@
 ===== Second Version: DIO Tester + Proto PCB =====
+We then rushed out a slight variation on the DIO Tester board, one that incorporates a tiny area of
+"protoboard"  holes, along with multiple holes for the Signal, +5, and Ground from the PWM/DIO cable.
+{{ ::dioboard2022-oshpark.png?direct&400 |}}
+We fabricated these at oshpark.com.  The board project can be [[https://oshpark.com/shared_projects/GGFh8RU8|found and ordered here]]. (Re-uploaded in 2023 because it somehow fell off my oshpark page)
+With to trace cuts and some careful placement, the banner adaptor circuit can be fit into this proto area.  We built several of these, including two that went to Houston for FIRST Championship.  But building the circuit in proto area tended to take rather long.
+{{ :img_20230119_220742539.jpg?direct&400 |}}
 ===== Third Version: custom PCB =====
+We looked into doing a complete PCB for the banner-sensor adapter circuit, but never completed it.
+One idea for that board was to include two transistors, signal LEDs, and DIO output connectors.
+That's right, two.  There are actually two output wires from these sensors.
+The stock standard black-colored Banner Engineering proximity sensor, available from digikey, has both normally-open an d normally closed contacts.
+The yellow ones we were given by another team has a normally-open signal, and another signal wire that seems to indicate when the signal on the first wire is reliable, or if the light returned from the detected object is weak.
+Hooking up both outputs to the control computer could enable it to determine if the sensor is connected properly, but the software would have to be different for the black vs. yellow versions.