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Updated 03/10/2009

Specialty Boards

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These boards were designed to meet specific needs of various customers.  I offer them here just in case there are others out there who might find them useful.








SapFlow Power Board: $21.00


This is a board (2 are shown) that I designed to be used to power miniature heaters that are used to measure the flow of sap movement in trees.  The board will power up to three heater probes and is stackable.  The terminal blocks are removable to make it easier to wire up.  There is also a test point to attach a volt meter to in order to set the probe(s) current (which is adjustable).


There are 2 versions of this board available.  One where the three heater probes are configured in series and one where the probes are configured in parallel.  The series version draws less current but if one probe fails, all three probes fail.  The parallel version draws more current (and requires a heat sink - provided) but the other probes will not fail if one fails.


Please specify which version you want when ordering.


Info Sheet




DC Motor Control Board: $20.00


This board was designed to run a standard DC motor forward or in reverse by using 2 TTL signals - one for forward, one for reverse.  The board is powered by the incoming power for the motor.  There are 2 pushbutton switches on the board that you can use manually control the motor.  Can drive DC motors up to 30V 5A (with adequate heat sinking).


Info Sheet



Shade Controller: $65.00


Here is a board that you can use to control your motorized window shades.  This board has two 10A relays – one for up and one for down.  There are 4 fused terminals for each direction meaning this board can simultaneously control 4 shades.  It is designed to work with motors that have a common and 2 “hots” – one for each direction, and will control both AC or DC motors (not mixed, though).  There is a remote 3-button switch attached to the main board via a 6-wire straight-through telephone wire.  The 3 buttons are for Up, Down & Stop.  When either the Up or Down button is pressed, the associated relay is activated providing power to the 4 Up or Down terminals for a user-determined amount of time.  This time is set using by inserting resistors into sockets on the board.  See Info Sheet for a table that shows time interval/resistor values.  When either the Up or Down relay is activated, the board will ignore the Up or Down buttons until the time interval has completed.  The Stop button will interrupt the time interval and stop the movement.  The board also has provisions to be controlled remotely.  There are 2 terminal blocks on the board – one for Up and one for Down.  A switch closure at either terminal acts the same as pressing either the Up or Down buttons.  This allows you to interface this to a computer via a relay board for automated control.


Info Sheet



PIC16F876a Demo Board: $85.00


Are you just learning how to program PIC Microcontrollers with PICBasic Pro?  Here is a nice demonstration board that will show you how to use a PIC16F876A to control an LCD, servo motor, and a relay as well as how to perform and display 10-bit A/D conversions and use an EEPROM.  This is a board that I wish I had when I was first getting started.  Comes with example software in PICBasic Pro.  Requires 9-24VDC at 200mA (min).

The board comes with the microcontroller, a 256K EEPROM and a 2-line X 8-char. backlit LCD.  With this board, you can learn how to:


  • Control the onboard 10A relay

  • Read a pushbutton

  • Control a servo motor (servo not included)

  • Display information on the LCD

  • Do A/D conversion (10-bit)

  • Store and retrieve data on an EEPROM

  • Store and retrieve data from PIC memory


Included with the board are example programs in PICBasic Pro that will show you how to do all of the above.  One program shows you how to read a voltage (0 – 5V supplied by on-board potentiometer) and display the decimal 10-bit result (0-1024) and convert it to mV (0-5000).  Another demonstrates how to control a servo in real time, log the motion to the on-board EEPROM and then replay the servo motion from memory.  You can modify these programs for many different purposes. 


Info Sheet


Miscellaneous Boards:


Below are examples of special boards that I have designed for some of my customers.  If you are interested in any of them or something similar, please contact me for pricing.


PIC Prototyping Boards:

These are boards that I designed to help me prototype my PIC-based circuit boards.  I have one for the PIC16F876, PIC16F628 and the PIC16F676.


Inverter Delay Board:

I designed this board for a customer that had a DC to AC inverter in his truck that was always on.  However, when he started up his truck, it would send the inverter into a fault condition due to the initial fluctuating DC voltage.  The board I designed had an adjustable delay setting that delayed the power-up of the inverter up to a minute after he started his truck which eliminated his fault condition.


Sediment System Controller:

This was designed for a university environmental toxicology laboratory to control the water delivery to an aquatic sediment toxicology study.  At specified times during the day, it would fill a reservoir and them empty it into the test chambers.


Hot Tub Control System:

This board was designed to replace the electronic controls for a damaged hot tub controller.  It will control a heater, sterilizer, light, blower, a 2-speed pump and a jet pump.  It is available for both air switch operation as well as electronic control with digital display.


This is just a few of the special designs that I have done.  If you see one you like or would like me to modify or design a new board for your special needs, please let me know!

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