Mini Sumo
- first one
Slider
Shows really wide 1" diameter HP printer rollers for wheels.
Wheel gears are seen on the extreme inside of wheels.
5 ea. 250 mAh NiMH batteries used for testing. Now have several
6-cell battery packs (purchased from SurplusGizmos.com).
Single screw removes battery pack for quick replacement.
Aluminum base, Brass frame. Left front edge sensor just visible.
Bottom View - shows slots for the two front edge sensors.
Four black screws tie the frame to the base plate. Two silver screws
hold the MCU board in place.
Note: Black area by the largest silver screw (upper right in photo)
is now the rear edge detector (cutout).
Motors from older GM8's. Running at ~8.4Volts.
Brass gears from 1/3RPM AC motors, approximately 48:1 ratio from motor
to wheel.
Small green switch (on left) to sense front panel moving now mounted
inside of the "body".
What seems to be a brass "wheel rim" is actually the brass part from
a 'slot-pentium mounting' countersunk for a screw.
PIC16F84A/04 running with a 16 MHz crystal, not a typo. Soon to be
upgraded to a PIC16F72 or PIC16F74.
78DL05AS LDO regulator (SurplusGizmos.com). Runs the MCU and all sensors.
TA8080K full bridge motor drivers, 2 ea. (SurplusGizmos.com) run from
full battery.
2 unknown vendor IR receivers mounted sideways, to be further restricted
in view.
Power Switch, Reset Switch. Two small LED's to see front edge
action. Larger LED is rear edge detector activity indicator.
Right front edge sensor made up of salvaged PC-serial mouse parts.
Trying to show how low it sits.
Only about 2 inches high.
About 8.5ozs in weight for this view.
Front View - shows black IR receivers in temporary mounting; front
panel temp also...
Those motor caps (0.1uF) are needed. Tried to run without them
but the motors are actually spark-gap generators
and really cause the interrupts to go nuts. It would run fine (without
them) as long as interrupts weren't turned on.
I needed interrupts so in they went.
---
Daryl (Slik) - Everything is soldered in place or bolted/screwed down,
including the body.
A body attempt...Now finished.
Gizmo's PCB material, $0.80 cost.
The front panel does stick out a bit - It's hinged see hinge pin/hole
at right front panel.
Behind it is a "pushing" switch hopefully to detect pushing or being
pushed.
This thing is now truly ugly, it needs a better body.
Weight: (by my small kitchen scale) Just under 11 oz.
Now visible: batteries & cable ties and sensors peeking through
the other front panel.
Added: Single rear edge detector.
This Page Updated: July 01, 2006 - PTB