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It has two configurations providing either 5VDC or 12VDC outputs.

Features

Power on/off Control

5-level Battery Voltage Display on Red/Yellow/Green LEDs

Low-battery indication

Low-battery shut-down

Uses replaceable, rechargeable Li-ion batteries

Specifications

Auto-shutoff Battery Voltage: ~3V

Low Battery Indication: ~3.2V

5VDC Version Max Current: ~1 A

12VDC Version Max Current: ~500 mA

Quiescent Current (sleeping): ~30 uA

No-load Current (on): ~10 mA

Credit goes to Dan Julio for making this open source. More info found here.https://www.danjuliodesigns.com/projects/bb1.html

PS2 keyboard to parallel ASCII with handshake (http://sbc.rictor.org/io/pckbavr.html) U1 ATtiny26(L) 20DIP300 J2 IDC14 J3 D_Mini6 (PS2 connector eg Mouser Part No 806-KMDGX-6S-BS ) R1,2,3 10k@R0805 J1 IDC6 (or Pin header) C1 100nF@C0805 C2 1.0uF@C0805

J2p1,2 GND J2p3..10 D0..7 J2p11 -> Stb J2p12 <- Ack J2p13,14 Vcc(5V)

J1 Serial programming 1..6 MISO, Vcc, SCK, MOSI, RST, GND

updated to add 2 more holes to the bottom

https://drive.google.com/file/d/1us6qhL1t99ipL4ohWROjktpYuVSQTXyr/view?usp=sharing

(gerber pack version: v1.0 20200705-0105)

Link to Hackaday project: https://hackaday.io/project/173730-stm32g473cxt6-breadboardable-minimal-system

This is a minimal system of STM32G473CxT6 MCU — all 48 pins, plus +5V power input, are exposed on a compact breadboard-compatible footprint (800 x 2500 mils). Although it looks like a glorified QFP-to-DIP adapter board, it actually has a few features that greatly improve Quality of Life while not adding too much to cost:

• Micro-USB connector
  • VBUS can be used to power the board
  • Data lines are connected to MCU
• Flexible power
  • Feed either VBUS or external 5V to on-board 3.3V LDO
  • TVS + reverse-polarity protection on +5V
  • Alternatively use external 3.3V and forget about 5V
• Cortex Debug Connector (2x5 keyed shrouded 1.27mm pitch)
• HSE (high-speed external oscillator)
  • Footprint for 4-pad SMD crystal + load capacitors
  • Alternatively free up the pins for GPIO
• On-board reset button
• BOOT0 handling
  • 47k pull-down + 1k pull-up (through jumper)
  • Since BOOT0 is multiplexed with PB8 on this package, this setup avoids accidentally back-driving external circuitry.
• Power LED (+3.3V) and “Blinky” LED (PC13)
• Silkscreen on both side clearly indicating pinout
• Headers can be soldered on both sides, although back-side male headers are preferred for breadboard compatibility

flex

FBA 1.7

Introducing a DIY tool to analyze NPN transistors. This device allows you to put in 3 resistors of your choice and measure the voltage drop across each of them (giving you an indirect measure of the current running through them). This allows you to experiment with current gain and saturation of transistors to understand how they are used in analog and digital circuits.

A DIY SR-Latch PCB. The middle breakout holes are for a Quad Nand Gate with the empty circle marking pin 1. Use this PCB to explore digital logic, memory, and how we overwrite memory.

DIP8 https://github.com/knicklux/Attiny_Programmer Short form

USFSMAX module for soldering to a main board.

Helper board for putting buttons and USB inside graflex-style clamp.

Allows an MLX90640 IR camera to be connected to a raspberry pi. Note that this adapter is made so the camera sticks out i.e. doesn’t go over the pi board like a hat would.

Adapts a DA-15 to the standard Atari SIO Jack, which is an option on the SDrive-NUXX, 1088XEL/XLD, and standard on the 576NUC+.

UNTESTED - Under development

This is an adaptation of TransistorTester to use the Arduino Pro Mini. Inspired and heavily influenced by Stefan Wagner’s implementation. This is the reason the resistor numbering starts at R3, for instance.

This version (1.4) fixes two numbering / pin assignment errors from the previous version. This also increases the size of the vias in the display connector and several other minor tweaks.

Bill of materials:

• 1x U1 - Arduino Pro Mini
• 1x U2 - 2.5v Precision Voltage Reference, LM4040DBZ-2.5, SMD SOT-23-3 footprint, Optional
• 1x U3 - I2C 0.96" OLED Display
• 1x J1 - 6-pin Female, 2.54mm Header Socket
• 1x J2 - USB Micro-B, Molex_47346-0001 (Used for power only)
• 1x J3 - 6-pin Male, 2x3, 2.54mm Header, Optional (ICSP interface)
• 1x SW1 - Push Button Switch 6mm (SW1), or 12mm (SW2)
• 1x R3 - 27k Ohm resistor, SMD 0603 (1608 metric) footprint
• 1x R10 - 2.2k Ohm resistor, SMD 0603 (1608 metric) footprint
• 3x R4, R6, R8 - 680 Ohm resistor, SMD 0603 (1608 metric) footprint, use 1% or better precision
• 3x R5, R7, R9 - 470k Ohm resistor, SMD 0603 (1608 metric) footprint, use 1% or better precision

References and Sources

• Article
• Original Code Repository: svn://mikrocontroller.net/transistortester
• Code Browser
• My code repository
• KiCAD repository
• Stefan’s Design

UNTESTED - Under development

This is an adaptation of TransistorTester to use the Arduino Pro Mini. Inspired and heavily influenced by Stefan Wagner’s implementation. This is the reason the resistor numbering starts at R3, for instance.

This version utilizes a “raw” ATMega328P with internal clock.

Bill of materials:

• 1x U1 - ATMega328P DIP (w/optional 28-pin narrow DIP socket)
• 1x U2 - 2.5v Precision Voltage Reference, LM4040DBZ-2.5, SMD SOT-23-3 footprint, Optional
• 1x U3 - I2C 0.96" OLED Display
• 1x J1 - 6-pin Female, 2.54mm Header Socket
• 1x J2 - USB Micro-B, Molex_47346-0001 (Used for power only)
• 1x J3 - 6-pin Male, 2x3, 2.54mm Header, Optional (ICSP interface)
• 1x SW1 - Push Button Switch 6mm (SW1), or 12mm (SW2)
• 1x R3 - 27k Ohm resistor, SMD 0603 (1608 metric) footprint
• 1x R10 - 2.2k Ohm resistor, SMD 0603 (1608 metric) footprint
• 3x R4, R6, R8 - 680 Ohm resistor, SMD 0603 (1608 metric) footprint, use 1% or better precision
• 3x R5, R7, R9 - 470k Ohm resistor, SMD 0603 (1608 metric) footprint, use 1% or better precision
• 2x C1, C2 - 100nF capacitor, SMD 0603 (1608 metric)
• 1x C3 - 10nF capacitor, SMD 0603 (1608 metric)

References and Sources

• Article
• Original Code Repository: svn://mikrocontroller.net/transistortester
• Code Browser
• My code repository
• KiCAD repository
• Stefan’s Design

Bluejay board