This updated Bare Bones Schematic is currently at version 1.4
and is subject to change without notice. It replaces versions 1.0,
1.1, 1.2, and 1.3. Use the blog's search feature to find any future
The suggestions from this thread, and some from another thread
are now incorporated into the circuit to maximize Propeller chip
performance, reliability, and facilitate ease of assembly for
The circuit allows lower power operations, mainly 3-volts with
two (1.5 volts each) AA batteries, and experiments at lower
voltages. Bare Bones is a good reference circuit and starting
point for many projects.
By itself, Bare Bones is considered to be a simple machine
project with provided software on the schematic and the ability
to communicate with a serial terminal, providing virtual
The program runs in rcfast (~12 mHz) and at 1200 baud
to blink a serial terminal LED on and off.