Control functions:
Control Function trimr R1 contrast LCD Button S1 backlight LCD Button S2 reset max. temperature Button S3 reset min. temperature
Pins X2 and X3 are not used in this software version.
Eagle 4.03 (displayed bitmap may not give accurate dimensions 85x54mm)
Part Value
C1 15p
C2 15p
C3 100n
C4 100n
C5 100n
C7 33u
D1 LED3MM GREEN
IC1 PIC16F627/04P
IC2 78L05
JP1 femmale jumper 16pin
to (for connection between LCD and the board,)
JP4 (LCD is supposed to have male jumper 16pin soldered)
Q1 crystal 4MHz
R1 25K
R2 1K0
R3 10K
R4 330
R5 10K
R6 10K
R7 10K
R8 10K
S1 button
S2 button
S3 button
X1 W237-02P (screw connector 2pin/5mm)
X2 W237-02P (screw connector 2pin/5mm)
X3 W237-02P (screw connector 2pin/5mm)
X4 M09H (Canon 9 male to the PCB)
LCD LCD (with backlight) 2x16 chars HD77480 controller compatible
Otherwise Power source could be from 7 to 30V.
WX LCD Display is designed for displaying data captured from the PIC WX full weather station. Connection between this module and the weather station is made by direct cable RS-232, or simply by connecting pins 5 and 2 of the weather station and WX LCD Display module.
Every time when data from weather station are received LED flashes shortly. After powering up LED flashes once which idicates succesfull inicialization. If LED is steady in ON state there is probably a problem with comunication between processor and LCD module.
This module displays actual temperature, presure and humidity. And (in addititon) maximal and minimal temperature reached since last reset of those values (by buttons S2, S3). Data on LCD are refreshed just after receive from the weather station.
Program accepts following comands from RS-232 inteface:
^V sends software version text
^U sends EEPROM contents
^D writes follwing bytes to EEPROM (but there has to be min 80miliseconds delay between bytes)
^R sends processor's registers contents (for debugging)
^r sends WX registers contents (for debugging)
characcter ^ means ESC key - all commands are composed as two keys commands first is ESC and next is one letter from above table
For download EEPROM contents and upload back into processor's EEPROM use of Piceerw program is recomended. full installation 1.4MB; exe only, needs ocx libraries (36kB)).