Shared Projects

Apex optical board

This assembly will work with most 4 pin “Optical Infrared Water Liquid Level Sensor” sensors available on eBay and Amazon. Below shows the type of sensor you should use. Make sure the sensor operates at 5V.

With the sensor connected to the PCB and the PCB assembly connected to your apex using the supplied DIN 8 cable, plug in the 5V supply to the assembly. If the optical sensor is DRY, the apex will show CLOSED for the associated switch. If the sensor is WET, the apex will show OPEN. You can use a standard contact switch (float) in parallel with each of the 5 optical ports as a safety backup as long as the contact switch is NO (normally open) to allow the optical sensor to function first. All 6 ports can be used as a normal switch input if optical sensors aren’t needed or in any combination. Port 6 is only contact switch.

Note on sensor mounting. We have found the best performance is to mount the sensor horizontally. This allows water to drip off the clear lens easier and react faster. Pointing straight up works as well but could collect water on the lens. The least preferred method is pointing down since water can sit on the tip of the lens and delay triggering.

BOM: Install 390 ohm resistors to positions R1-R5 (P/N CF18JT390R) Install 6.8k ohm resistors to positions R6-R10 (P/N CF18JT6K80) Install diodes to positions D1-D5 (P/N 1N4004), note the end with the silver marking must be positioned with the marking on the PCB Install the 5 4 pin headers to J2-J6 (4-Pin XH2.54 2.54mm Shrouded Header, source EBAY) Install the DIN 8 connector at P1 (P/N MD-80SM) Install the power supply connector at J1 (3 pin DC 2.1 Power Jack Female PCB Socket Plug 5.5*2.1mm, source EBAY) Install the 12 port header to J7 (P/N OSTTC120162)

Power supply: https://www.amazon.com/gp/product/B00GUO5WUI/ref=oh_aui_search_asin_title?ie=UTF8&psc=1 PM1/PM2/APEX to board cable: https://www.ebay.com/itm/6ft-Mini-DIN-8-Pin-M-M-Male-to-Male-Beige-MD8-8-MiniDIN-MDIN8-Cable/301756594107 Optical sensors: Look on ebay or amazon for any generic 4 pin optical sensors. Note: they typically aren’t the greatest quality so pick up a few spares.

Version 2.4 which isolates and moves the SI7021 sensor from the MCU to prevent thermal issues with sensor.

Same as my other nes board just uses a 9 pin mini din for compatibility with hd retrovision cables. Requires either a passthrough scart cable with a genesis 2 mini din pinout or removing the capacitors and resistors on the rgb lines of the nes rgb board. Can use hd retrovision cables if cvbs line is wired up.

Micro RX based on the XN297L SOP8 chip.

Click the description button below to make the links work

Get the chip here

Find the BOM here

Find the parts map here

Top side pads : Top Left = Antenna Pad

Bottom side pads : From top left = gnd, cs, sck, sda, 3.3v

sample nfc testing board

Micro RX based on the XN297L SOP8 chip.

!!– DO NOT ORDER THIS BOARD–!!

This board has been replaced by this board

Replacement PEC boards for the Dyna FM3 Tube Tuner

CMOS/TTL Logic Probe

I generated the PCB files from Steve Adolph’s Eagle files from here: http://www.club100.org/memfiles/index.php?&direction=0&order=&directory=Steve%20Adolph/REX/info

Use Brian White’s Wiki page for directions on how to build your own: http://tandy.wiki/Building_a_REX

On order so not yet verified to be functional.

Feather Prototype for AP3602A 5v boost breakout with Molex con. for Honeywell HPM. Developed for the KnighLab SensorGrid project. This is very much a work in progress and will be going through updates as we iterate on the sensor node design.

Predicting Tracker

jst sensor

16x16mm 4 layer 4 in 1 BLDC controller