Building the PCB
Building the PCB
Fit and solder the four wire jumpers first, then the other components except the PIC in ascending height order until only LEDs remain.
Fit all the LEDs to the board without soldering them.
The flats on the outlines printed on the PCB designate the LED
cathodes.
The shorter lead is the cathode for most LEDs, but you should confirm
this
if you are using LEDs other than those specified in the Parts List.
Fit the board to the (already drilled) front panel, artwork and
perspex,
using 10 mm long spacers between board and panel.
Fit each LED into and through the corresponding hole in the front panel
until it touches the perspex.
Solder the LED leads to the PCB.
Connect wires to the board for the serial port socket (DB9(S)), and connectors for the battery and the sensor.
Use a socket for the PIC. Fit the PIC only after you have checked that there is +5 volts on pin 14 when power is applied to the board.
Orientate the PIC socket according to the legend printed on the PCB. Take care to install the PIC the right way around, as either total destruction results or subtle faults develop in a PIC which is oriented incorrectly and powered up.
Connect the sensor and power up the completed board. Expect the
North
and zero speed LEDs to light.
Spin the sensor rotor by hand. Expect a non-zero speed and a changed
(invalid) direction to be displayed.
See Fault Finding if necessary.
Main board attached to front panel
NEXT: Calibration
