|home >||Zero2 < Beeber > First-Step||16 July 2020|
|Beeber - by David Buckley||1986|
D0 - Right Motor forwards + Green LED D1 - Right Motor backwards + Red LED D2 - Left Motor forwards + Green LED D3 - Left Motor backwards + Red LED D4 - Right Bumper - pressed =1 D5 - Left Bumper - pressed =1 D6 - Right Eye (LDR) - bright =1 D7 - Left Eye (LDR) - bright =1 The umbilical is 10-way ribbon cable terminated in 2x5 IDC connectors. D1 D3 D5 D7 5v D0 D2 D4 D6 0v The white box between the User-Port cable and the 10-way umbilical holds a 74LS241 dual quad schmitt 3-state buffer.
It was intended to sell Beeber as a kit but my domestic circumstances brought work on Beeber to an end and when circumstances were better the market had changed, so Beeber was abandoned. All that was incomplete were the wheels which never got beyond simple wooden discs.
However during the 2020 Corona Virus lockdown I decided to finish Beeber. I cleaned up the wheels, bushed the bores with brass tube so they fitted the axles, turned a groove in each rim to take an 'O' ring tire, and sanding sealered and spray painted them.
Then for the first time I could test Beeber using a switch box I have. Since I didn't have any C-cells I made C-cell sized tubes from rolled-up paper to hold AA cells which are the same length as C-cells. Beeber drove very well, quite spritely, quiet and was very controllable.
On 13 July 2020 I wrote a simple Basic-Stamp-2 program (Beeber.bs2.txt) for Beeber. It works so well I might make more similar vehicles with additional sensors and onboard computers.