Circuit to take a flickering LED and amplify to the signal to drive larger loads, such as LED tape.

DS1339 Real Time Clock with optional coin cell battery backup

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 very close to “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 driving a high impedance DUT. Its current drive is limited to about 10 mA if R5 is bypassed (shorted out), but the value of R5 in the given design limits current to a few microAmps, consistent with the intended application.

I am currently making a change to free up pin D4 for the SD card. I’ll get that revision up here by Aug 10, 2019.

Observing anything, even a plant, that is producing a voltage is not supported, which means that using this device for Plant Electrophysiology will combine both the voltage and conductive aspects of the DUT into something indecipherable relative to the intended purpose. In contrast and greatly different, there is a product called Plant SpikerBox (that has been confused with this GWAAMC project) which observes only the voltages produces by certain plants that respond physically to physical-dimension stimuli. That product doesn’t apply the electrical current to the DUT required to observe conductance. This GWAAMC device does apply that current, but it will also be affected by voltages produced by the DUT because those voltages will affect the resultant current. The claim being investigated by this GWAAMC device is that non-physical dimension interactions can cause plants to respond with a change in their electrical conductance rather than them responding with voltage. The claim by those investigating in the Plant Electrophysiology field is that some plants produce a voltage response to physical dimension stimuli - not all that unexpected nor exciting, I’d say, even though it is a fairly new field of study, to be sure.

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 then 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 3V3 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. If your soldering skill set is from repair like mine is, you could be in for a surprise soldering onto a new board - whatever plating you ordered on the pad leaches into the solder you apply and instantly causes its melting point to increase 10-20 degrees from bare naked solder, un-wetting the pad if you don’t have the temperature high enough to overcome it. It happens while you try to place each component onto new pads that are plated with any metal (like gold) or alloy (like a solder-ish tinning) dissimilar to the solder you’re using. In a word, your solder becomes less eutectic by cross contamination with whatever the fab house plated the pad with. Additionally, gold and lead do not play together in solder (“embrittlement”), and neither does lead and bismuth (fail by SnPbBi)…double tinning is the fix to wash gold plate off, no remedy is available for the PbBi contamination. That one sure blindsided me. Pick and place fiducials have now been added in case you decide to contract the soldering to a pick and place fabricator.

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 ordering with the gerbers at gwaamc.com will not only ensure you have the most advanced version of this training aid available, but allow you to order from any fab house you choose.

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

board “trinketm0fader_35mmad” Using Adafruit Trinket M0 and Adafruit 35mm slide pots.

For NeopixelTester project

https://github.com/todbot/NeopixelTester

Small board to hold modifications to the R3500D sense antenna circuit. The modifications improve the cardioid antenna pattern.

See Project Page

R1,2,3 - 75ohm 4 - 4.7kohm C1 - .1uf Grounded the unused 7374 pin. THX Mobiusstriptech

A breakout board for Analog Devices' 8x12 analog cross-point switch

Hackaday.io Page

Order from Tindie

Source at github

A breakout board for the Dallas/Maxim i2c logarithmic potentiometer

Hackaday.io Page

Order from Tindie

Source at github

Tilt sensor power and data bridge

Owi robot Driver controller board.

Ethanol flex fuel sensor controller board.

V3

• Moved CAN_ACC to OBD-II CAN3

1930 breakout PCB with power, data , & clock LEDS