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).
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.
specify which version you want when ordering.
DC Motor Control Board: $20.00
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
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
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
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
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:
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
Sediment System Controller:
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:
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.
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!