Electroteach

Sometimes Grammarly is used to verify spelling and grammar. However, there are occasions when I choose my own rules.

Thu Dec 19 18:39:06 2019
Sometimes something is donated but on receipt, it appears not to work. In this example, it was a bedside radio. The manual may not be present and the item may be too old to find on the internet. So the dismantling process is started. The item may be composed of many sub-modules and some of them may be identifiable electronic sub-units such as keypads, rotary controls for volume, motors (DC or stepper) and so on.

Shimano MF-Z012 freewheel 5 speed 14-28

Teeth are 14-17-20-24-28.
Here is a code snippet for a Haskell program.

bg :: [Double]
bg = (/) <$> [22.0, 32.0, 46.0] <*> [14,17,20,24,28]


Shimano-Mf-Z012

wikipedia:integer sorting
I was specifically interested in 'selection sort' as an example of teaching different methods of achieving the same result. Compare this with a bubble sort type of operation where each successive pair is tested and the largest value is (re)placed on the right-hand-side (RHS).
Example input was 9,4,7,2,5.

wikipedia:comparison sorting

entry into amateur radio as a young person

74hc595

yaesu page on FT857D
For the manual you can Google

ft-857d manual


PM42M_Stepper_Motor

check this out

521H 7 segment display is available in common cathode and common anode versions.
521h
Pins 3 and 8 are treated as connected together - the common pins.

Segment letters are enumerated clockwise from the top, G is the middle segment.
The display colour is red.
One current (active) project uses shift registers, 74HC595, to minimise the number of IO pins used on the micro-controller.