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Flashback : Prework
Log from TI-57 Programmable Calculator Hardware Retrofit
The more I read about the TI-57, the more I wanted to fix mine. Of course, these are easily found on a-large-well-known-online-auction-site for modest prices - typically $40 or less. Like most hobby projects, my goals were entirely devoid of practicality. ...

Flashback : Measurements
Log from TI-57 Programmable Calculator Hardware Retrofit
I carefully opened a TI-55 donor unit and inserted a 27ohm resistor in series with one of the digit cathodes. I captured the display sequence on my trusty LeCroy oscilloscope and dumped to the built-in thermal printer - TI-55 LED...

I didn't choose the MCU ... it chose me!
Log from TI-57 Programmable Calculator Hardware Retrofit
I like the STM32 ARM cortex MCU family. They are well documented, readily available, and cheap 'breakout boards' for them abound. The MCU retrofit must fit nicely in the space of a 28-pin 0.6" pitch DIP, so package size is key. The STM32F103 is...

Driving the Display
Log from TI-57 Programmable Calculator Hardware Retrofit
The TI-57 has a multiplexed 12-digit common cathode LED display. The corresponding 8 segments of all 12 digits are connected together; sort of. It turns out that TI economized on IC package pins by ”doubling up” the decimal point segment...

Day 2 (part 1) - Fabric, Access, Workshop and LEDs!
Log from Cultural Integrity (at the Dethrone Hackathon)
The big hacker day was upon us and the gears were in motion! Julia jumped into action during morning solo hacker time. She went to the Mission Fabric Outlet store to find our throne-worthy textiles, as well as coordinating with a participant...

Prerequisites and software
Log from VGA videocard for microcontrollers
Sometimes, when making your own devices on microcontrollers, there is a need to display huge amounts of information on a display and to use a bigger screen for ease of perception. Unfortunately, there are no ready-made and budget-friendly solutions for...

From prototype to product creation
Log from VGA videocard for microcontrollers
First of all, you should pay attention to the ROM used. The flash-ROM chip from an old computer motherboard has a finicky parallel interface where the address is written in two runs. This complicates the operating logic and increases access time. Additionally,...

Schematic
Log from "Perpetual" Wristwatch
It's have simple schematic, for save pins I used Charlieplexing(35 components in total): https://en.wikipedia.org/wiki/CharlieplexingIn this project i use for charging 12 light sensor BPW34S, on clear sun one cell make 0.5-0.6 V and ~2 mA, connect its...

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