2009:Electrical Main 1.17.2009
1.17.2009
Start time: 11:00
End time:
Members present: Michael H., Dave(Apples), Dave(oranges), Rika, Victor, Sean
Tasks Completed:
- Investigated Shaft Encoder - US Digital E4P-250-250-D-D-D-B
-Mounts on 1/4" shaft(press on, no set screw required)
-Mounts with 3-48 screws on flat plate or motor housing
-Needs +5 V supply, 18 MA for LED, 5 MA, for detector
-Output V high - 2.4, low - 0.4, with 2.7k ohms Pull-up resistor
-250 counts per revolution(CPR); at expected motor transmission output RPM of 350, this gives about 2917Hz output.
-Price - $22.95 - 1, $18.04 - 10
- Investigated a second shaft encoder for larger diameter motor shaft of 0.375" (3/8") which the mechanical subteam prefers
-US Digital E7P-180-375-S-H-G-3
-this accomodates .375" shaft and has a thru-hole and extra mounting ears.
-Price is $43.50 - 1
-Electrically the same as E4P above, except slightly higher current of 27mA.
-we don't need a lot of resolution, so we'll get the lowest resolution 180 counts per revolution (CPR) which should give about 2100Hz at 350RPM.
-outboard mounting ears have 0.116D holes.
- Found a banner sensor. Reciever specs are as follows:
- Part number: Q10RP6R - Q10 Series: Receiver
- Range: 1.8 m
- Input: 10-30V dc
- Output: Dark Operate (Means that the sensor activates when the beam is broken)
- PNP
- Cable length: 2 m (6.5 ft)
- Price: $36.80 - Emmiter specs are here:
- Part number: Q106E Q10 Series: Emitter
- Range: 1.8 m
- Input: 10-30V dc
- No outputs
- Cable length: 2 m (6.5 ft)
- Price: $31.28 - Finally re-made the BOM
- Decided that Hopper will have two banner sensors and that the conveyor will not require the full 8 sensors originally talked about.
- Put Brundy hardware on the batteries and Anderson pre-made pigtails.
Tasks In Progress:
- task
- task
Tasks to Complete:
- Design "homemade" shaft encoder for conveyor motors.
- Communicate sensor mounting to Mechanical teams.
- Experiment with mice as sensors for determining robot position by rolling along floor.
-Test interfacing... There are two ways to do this either use a PS/2 mouse and decode the packet (talk with programming about this), or take encoder readings straight from
encoders (if we use a ball mouse).
-Mock up ball mouse with encoder outputs.
-Determine how fast we can move a mouse and still not lose encoder counts.
Images & Additional Updates:
