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Issue 1.0 16/12/99
5.2Wheelpilot WP30 PCB Assembly
Introduction. The PCB Assembly is a generic item which can be used for
Wheelpilots WP10 and WP30 and for Tillerpilots TP10, TP20 and TP30. The differ-
ent versions are created by applying different components to the common PCB. The
circuit diagram for the TP20 / 30 and WP30 PCB is given in Drawing No. E03372.
Supply and Regulation. The WP30 is designed to work from a 12 V source.
Protection against incorrect polarity is provided by D1 and D4. Capacitors C1and C3
are used as reservoirs to hold up the supply voltage and reduce any supply dips.
Protection against over-voltage spikes is provided by Resistor R2 and Zener Diode
ZD1 and Regulator REG1 provides a 5V regulated supply. Transient Voltage
Suppresser TVS1 protects the MOSFETdrive transistors, TR10 to TR13, from voltage
spikes greater than +16V.
Microprocessor.Light Emitting Diodes LED1 to LED4 are driven from the micro-
processor IC2 Ports P0.0 and P0.2 to P0.4 and turn OFF when the line goes HIGH
via the transistor switches TR2 to TR5. When the transistors are off, resistors R32,
R34, R36 and R38 provide a low current path for the LEDs to provide low level night
illumination. The Audio Resonator AR1 is self resonating and switches ON when Port
P0.5 goes HIGH via the transistor switch TR1 and resistors R59 and R60. The con-
trol key lines on Ports P4.0 to P4.4, normally pulled to +5V via resistors R7 to R11,
are “scanned” by the microprocessor to detect if any of the switches have been oper-
ated and pulled the line LOW.
NMEAdata inis optically isolated by IC5 and then fed into Port P2.4 of the micro-
processor. Transistors TR6, TR7 and TR8 and components D6, D7, D8, R17, R18
and R19 form a switch, protected from high voltages, driven from Port P0.1 of the
microprocessor. The switch is used to apply the synchronisation pulse
(HR200_SYNC) to the NMEAline for products employing a Hand (Remote) Controller.
The Links, L1, L2 and L3, are used to configure the Microprocessor to either
Wheelpilot or Tillerpilot operation and to model versions 10, 20 or 30 in accordance
with the table below:
N / C - Normally Closed (soldered)
N / O -Normally Open (unsoldered)
Microprocessor Reset. Integrated Circuit IC6 is an integrated reset generator for the
microprocessor which produces a reset LOW pulse of approximately 50mS duration
at switch on and whenever a 5v supply failure occurs. In addition to the reset provid-
ed by IC6, the microprocessor has a built in watchdog timer which will create a reset
if a software crash occurs for any reason.
Model
Link 1
Link 2
Link 3
TP10
N /C
N /C
N /C
WP10
N /O
N /C
N /C
TP20
N /C
N /C
N /O
TP30
N /C
N /O
N /O
WP30
N /O
N /O
N /O
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