Docker stuff

Removing all docker containers in one go

docker container rm `docker ps -a | cut -f 1 -d " " | tr "\n" " "`

We are using command line substitution with the ``, and populating the container ids inside it. The cut gets the first field from docker ps, that is the id, and the tr replaces the newline with a space, so that we get all ids in a single line.

Btw, this will also work in the new Linux Subsystem for Windows(LSW) command line, its able to see the docker container created from windows command line.

A simple timer switch using a potentiometer

 

A draft, not yet complete...

A digital timer that uses a potentiometer and ADC to select a time interval. The input triggering circuit is isolated from the mains using an optocoupler.

BT136 triac

MOC3061 optocoupler

pic12f675 - the cheapest microcontroller i could find, with an ADC.

The potentiometer is missing in the circuit below, its connected to the ADC

For the source code, see https://github.com/manojmo/pic_micro/blob/master/pot_minutes_calc.c

Based on the potentiometer voltage read from the ADC, it calculates the ON time, turns on the triac, waits till the ON time expires, then turns OFF the triac.