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Senseo coffee automation (ATtiny 85, SG90)

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Tired of waiting in front of your coffee machine until it heats up? 3rd version of my Senseo coffee machine automation.

Updated at source: Jan 2, 2022

Model information

Third go at automating my Senseo coffee maker: turn it on, wait for it to heat up, pour a cup of coffee and turn it off again.

First try was simple but hard to set up and not very reliable when pushing the buttons:

Next iteration was robust and running for a couple of months; only drawback was slow speed for the steppers to turn the M5 pushing rods:

This version of much faster and still reliable ;-) :

Main features:

Simple electronics based on a attiny85 and SG90 servos
Increasing force of servos with double threaded 8mm pitch about 20mm custom thread (pushing force >10N measured)
Additional latching circuit court zero power consumption at idle
Electric setup: old phone battery with Tp4056 for charging, latching circuit from electronoobs (see source link below, with IRF9540N and 2N2222 as transistor drop in replacement), small boost converter 3.7V → 5V, actual attiny85.
Safety feature: program only starts if cup is in place (switch attached to machine)
Code for flashing attiny85 is included, it is Arduino based. I'm not a programming hero; I've derived it on the “useless machine” code from bra lark over at thingiverse
Small wiring writeup for attiny85: Pin 0: 1st servo, pin 1: 2nd servo, pin 2 safety switch (needs to be pulled low for “go”), pin 4: controlling latching circuit (needed to learn the hard way that pin 3 does not work for this… since it seems to be “high” on boot)

Source links: