Test setup
Testing video
Project 31 : Intercom System
Microphone test
Microphone and speaker with 1st stage amplifier circuit
Video 1
Project 30 : Wireless RFID Tracker
Early system setup
RFID Transmitter
RFID Receiver
Full system setup
System on PCB
Finished product
Project 29 : Bipolar Stepper Motor Driver
Driver using L298 and logic ICs
Video 1
Driver using L293D and PIC
Project 27 : 915MHz RFID Barrier Gate Interfacer
915MHz RFID Reader Interfacer
Early testing video
Project 26 : ADC and DAC Checker Board
Circuit setup
ADC0804 video
DAC0800 video
ADC DAC Board Version I
ADC DAC Board Version II 
ADC PCB Layout
Version II Video
ADC PCB Layout
Project 25 : Speed Boat Controller
Project setup
PWM output signal
Dual boat engines
Driver schematic
Early setup video
Tut 8 : First Order Circuit
Answers
7.4) Vc(t) = 40exp(-50t)
7.11) io(t) = 1.2exp(-3t)
7.40 a) Vc(t) = 4+8exp(-t/6)
7.54 b) i(t) = 3-1exp(-9t/4)
Project 24 : Leakage Current in High Voltage Application
System circuitry layout
High Voltage Set
HV SCADA early setup
Tut 5 : Superposition & Source Transformation
Answers
Q1. I = -0.125A
Q2. Ia = - 8 A
Q3. Io = 1 A
Q4.
Project 21 : Scanning Array Unit
8-wire unipolar stepper motor
Early project setup
Early project test
Early video 1
Early video 2
Test setup
Testing video
Finished product
Finished video
Tut 17 : LCD Big Characters
Big characters
PBP Program
'program to display big characters (numbers) on LCD
DEFINE OSC 20
@ device hs_oscDEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 4
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 5
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
TRISB = 0
TRISD = 0
nPos VAR BYTE
LCDOut $FE,$40,$01,$01,$01,$01,$01,$01,$01,$01 ' Cust Char #0
LCDOut $FE,$48,$1F,$11,$11,$11,$11,$11,$11,$11 ' Cust Char #1
LCDOut $FE,$50,$1F,$10,$10,$10,$10,$10,$10,$1F ' Cust Char #2
LCDOut $FE,$58,$01,$01,$01,$01,$01,$01,$01,$1F ' Cust Char #3
LCDOut $FE,$60,$1F,$11,$11,$11,$11,$11,$11,$1F ' Cust Char #4
LCDOut $FE,$68,$11,$11,$11,$11,$11,$11,$11,$1F ' Cust Char #5
LCDOut $FE,$70,$1F,$01,$01,$01,$01,$01,$01,$1F ' Cust Char #6
LCDOut $FE,$78,$1F,$01,$01,$01,$01,$01,$01,$01 ' Cust Char #7
Pause 500
LCDOut $FE,1
loop:
nPos = 0
GoSub Zero
nPos = 1
GoSub One
nPos = 2
GoSub Two
nPos = 3
Pause 2000
GoTo loop
Zero:
LCDOut $FE,$80+nPos,1
LCDOut $FE,$C0+nPos,5
Return
One:
LCDOut $FE,$80+nPos,0
LCDOut $FE,$C0+nPos,0
Return
Two:
LCDOut $FE,$80+nPos,7
LCDOut $FE,$C0+nPos,2
Return
Tut 16 : LCD Custom Characters
Most of the alpha numeric LCD like 16x2 character has ability to generate few custom characters. Custom characters on any 16x2 LCD provides the functionality of CGRAM (Character Generator RAM) where you can create your own characters for display. The codes for custom character generation using PIC16F877 microcontroller can be created using any custom character generator available in the internet. The custom character generation using PIC16F877 is in 8bit mode.
Custom characters on LCD
Battery character on LCD
We can program 8 custom characters when we are using 5x8 font in the LCD settings and we can program 4 custom characters when we are using 5x10 font in the LCD settings. The binary coding in the custom charactor generator can be written in HEX form as in PBP program below.
Custom character generator
PBP Program
'program to display some characters on LCD
DEFINE OSC 20
@ device hs_oscDEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTB
DEFINE LCD_RSBIT 4
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 5
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
TRISB = 0
TRISD = 0
LCDOUT $FE,$48,$0E,$15,$1B,$19,$1B,$15,$0E,$00 ' Cust Char #1: copyright
LCDOUT $FE,$50,$0E,$0E,$1F,$0E,$04,$00,$1F,$00 ' Cust Char #2: press
LCDOut $FE,1
Loop:
LCDOut $FE,$80+0,0
Pause 1000
LCDOut $FE,$80+1,1
Pause 1000
LCDOut $FE,$80+2,2
Pause 1000
GoTo loop
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