Shared Projects by dewhisna

18-Pin Shrunk DIP 0.550", 0.070" pitch (13.97mm, 0.1778mm pitch) (SDIP018-P-0550) Adapter to convert it to 18-Pin Wide DIP 0.600", 0.100" pitch (15.24mm, 2.54mm pitch)

This design has been replaced with Version 2: https://www.oshpark.com/shared_projects/QzN0O7fN.

This is an Arduino Compatible Interface Shield for interfacing with Blushless DC (BLDC) Motors having their own 3-Phase controllers with a PWM Speed Set Input. It supports either a two-signal 90-deg quadrature speed sensor or a 3-Phase Hall-Effect speed sensor input. It has support for an optical reflectivity sensor for Zero-Position/Index sensing or it can use an external Z-Pos Index Sensor. Supports both 3.3V and 5V logic with on-board level shifters.

ERRATA: The silkscreen labeling for the ‘direct’ vs ‘opto’ modes on the Z-phase source selection jumper JP6 are backwards. The pin marked ‘direct’ is the ‘opto’ input and the pin marked ‘opto’ is the ‘direct’ input. Also, I forgot to add a ‘ground’ test-point pin. Otherwise, everything works as expected. The Z-phase optical reflectivity sensor design on this board, unfortunately, is too slow and unresponsive for most motor applications. This version has been replaced with version 2 https://www.oshpark.com/shared_projects/QzN0O7fN, which allows for a faster reflectivity sensor input design, plus supports a hall-effect Z-phase input.

DO NOT BUILD this version. Use the new version instead.

NOTE: This version has been replaced by a new version.

Laser Control Board Arduino Shield for the Laser Vision System. This board interfaces the laser PWM power modulation and on/off logic, as well as the LaserEye Reflection Sensors.

ERRATA: The negative voltage inverter on this board is unstable and has issues, generally causing it to go up-in-smoke. The laser power switching circuit on this board switches the low-side of the power supply, but the PWM output is referenced to ground, meaning that the laser will always stay powered up, rendering the power switching circuit useless. Use the new version of this circuit instead, which works rather well.

OPT101 Based Laser Reflection Sensor with selectable gain jumpers and Ambient Light Rejection (ALR) circuit. Part of the “Laser Vision System”.

Simple 555 charge-pump circuit to create a negative tracking split supply voltage that mirrors the single supply input voltage.

It was an implementation of this design: http://www.syscompdesign.com/Negative-Tracking-Power-Supply_b_89.html for testing.

NOTE: This circuit isn’t stable and will generally go up-in-smoke. I advise forgetting this one and use the LM2662 based circuit instead, which works well.