LEAP#314 AT28C EEPROM Programmer with Port Expander
The AT28C16 is an old-school 2k x 8-bit parallel EEPROM. Since it has parallel addressing and data lines, it opens a whole range of possibilities with discrete logic circuits (i.e. no SPI or I²C in sight).
I was inspired to explore more by Ben Eater’s use of EEPROMs for his 8-bit computer build.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#313 MCP23S17 Port Expander
The Microchip MCP23S17 is a 16-bit port expender that can be controlled for example from an Arduino over SPI (MCP23017 is the I²C variant). It supports digital input and output on all pins, and interrupts can be configured if required. As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#312 Matrix Firecracker
I was a bit dubious about the possibility of creating a decent firecracker animation on the 24x5 Matrix display. The additional PWM settings create another dimension, so the simulacrum is perhaps not so far off the mark. To light the firecracker, I want to use a real fire of course;-) As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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LEAP#311 The Boldport Club Juice
Juice is a battery replacement kit that uses a pretty nifty set of AA, AAA, A23 and CR2032 inserts to inject the required regulated power where a battery or two would normally be required.
Power can be supplied via the micro USB connector, or any other power supply that can be clipped or screwed on to the body of the Juice.
All the structural parts punch out from the classy PCB like a model plane kit;-) The box folds up and doubles as a “Juice box”.
As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub
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