Nostalgy feels me when I put my finger into a hole, turn down the dial and awits it to come back...

And why not to transform it as a Skype computer?

Size is the main difficulty. We cannot put a traditional motherboard (min 17x17cm) in such case. Fortunately Pico-ITX motherboards (7x10cm), as wide as a 2.5" hard drive, exist. It costs about 250 €, with no possibility to change CPU...

Next is the rotary dial. How to use it?

Solution : convert pulses as pad comntroller, following the scheme :

From the 2 signals the dial generates :

What does it do ?

• With JK flip-flops, we memorize each pulse on negative change from signal 2 as a channel : pulse 1 feeds channel 1, pulse 2 feeds channel 2, etc.
• We only keep the last fed channel : if we have 3 fed channels, we only keep channel 3
• The last fed channel waits for negative change of signal 1 to launch specific action (crossed circle)
• To stop action, we send Reset signal with a timer (capacitor) to switch off all JK flip-flops.

Rotary dial composes numbers

Webcam will me set in rear speaker

• Rotary dial phone
• Pico-ITX motherboard
• Compact Flash card
• Memory card (of place for it)
• Webcam
• MBED micro-controller

• Waiting for components

No idea...