High performance electrical conductance observing/graphing tool. Uses the plotter in the Arduino IDE to observe changes in electrical conductance that occur in plant tissue in vivo and in situ. The stimulus expected to produce said conductance response can be called telepathically transmitted empathy (telempathy), but a more religious term for it is “faith”. By changing electrode types and DUT to your own preferences, this may be used in numerous other ways as well. It is designed for extreme sensitivity applications if you follow the instructions in making the shield hermetically sealed and keep the PCB from contamination indefinitely. This device is capable of detecting nano-ampere changes in high impedance DUTs it drives. Its current drive is limited to about 10 mA if R5 is bypassed (shorted out), but R5 in the given design limits current to a few microAmps for the expected application.

Uses UNO A6 and A7 (ADC6 & ADC7) that the advanced UNO boards have started including on J2 pins 1 and 9 (BaiTe, CNEWTEC) and an additional connector that SainSmart uses. Provides for wireless which is not in the BOM nor in the sketch- you’ll have to shop for that and use/program it without our help right now. That footprint follows the HC-05 convention. With the Arduino 101 which uses its own BLE wireless, the HC-05 footprint can be used with a wifi device of the same pinout as a HC-05 so you can have two different wireless means of communication IF YOU MAKE SKETCH CHANGES TO DO SO. If using this with Arduino 101 or for some other reason 3.3V appears on ICSP1 pin 2 of your MCU, follow instructions for J2 pins 4 and 5 jumpering with solder and wire or pin from pin 5. If your MCU operates at 3.3V but 5V appears on your MCU ICSP1 pin 2 (I’m thinking of Arduino Zero), you’ll also have to remove JP6 to keep from shorting 3.3V to 5V. Note that power will then only be reaching this board through a single pin instead of 2 pins, doubling whatever voltage drop there is between the two boards. Hopefully that extra voltage drop will be insignificant, but then again, it may prevent the HC-05 type wireless module from working.

Modifying for 3V will mean you cannot use in 5V environment unless the mod is unsoldered and reversed, since I didn’t find room on the board there for a slide-on/off jumper. However, if you don’t mind a sliding jumper dangling off the edge of the board, you might be able to fashion such a jumper for easier interchangeability between 5V and 3V systems.

Note that in 3V systems, Q1 and Q2 MAY need to be shorted across D-S, which would reduce sensitivity an unknown amount. Until I get things working in a 3V environment, I won’t know specifics any better than that.

Near the MSOP-10 packages, there are divits/holes so the builder can use straight pins to assist holding those packages steady while soldering them down (the “M” in MSOP stands for “microscopic", don’t you know). Assist holes also are with U2.

Inspired by the deeds and words of our Lord Jesus Christ when He made the fig tree wither overnight with a curse and by the findings of Cleve Backster using the GSR aspect of a polygraph machine. The details found at http://gwaamc.com should be consulted for further info before deciding to build this yourself. You’ll also find the BOM there. Note that I am able to keep those files more current than the project as available here since this project can ONLY be updated here when a new order is placed, so ordering from gwaamc.com will ensure you have the most advanced version of this training aid available.

Currently awaiting prototype PCB’s for testing, so build at your own risk.

https://github.com/adafruit/Adafruit-Radio-FeatherWing-PCB

butterfly boards with cutouts

An Arduino shield to demonstrate programming an LCD display - with toggle switches!

Commodore A501+

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Check out the build log!

Teensyboy—Arduinoboy with Teensy 2 and accompanying breakout boards

An RGB LED strip controller using a wemos to control them using a Blynk program from a cell phone.

Mechanical version of ETROC

Details check

https://dl2sba.com/index.php/funk/sdr/303-local-sdr-up-and-running-2

This is the Controller Flash to my 16-bit computer. It will take in the instruction, the micro-step, and the special register flags, and then return the control lines.

See Jim Wright’s 16-bit CPU

A totally useless 9mm diameter Cortex M0 MCU board, with a few pins brought out. There’s SPI and I2C available.

PCB to cable board for Photometrics BSI power connector (Cui PD-40).

Model T EEPROM

http://tandy.wiki/Teeprom
BOM: https://www.digikey.com/short/pbch8c
Sled: http://www.thingiverse.com/thing:3723135 or http://shpws.me/Rm6Y

Maybe it’s done!

Version c8

BOM: https://www.digikey.com/short/pbc8cw
Sled: http://www.thingiverse.com/thing:3723135 or http://shpws.me/Rm6Y
http://tandy.wiki/REX

Version c6 has been tested and verified working. The electronics have not changed since that version, only the shape of the outside edge of the pcb and polarity hole and the footprints of the stagger-row pin header ports.