STAR-DELTA STARTER WITH VOLTAGE MONITORING USING PIC16F877

Note:

• Use variable resistors to simulate voltage errors
• Contactor Coils replaced with LAMPS

Features:

• Starts Motor on Star to reduce starting current and switches Delta after some time
• Monitors voltages and stops Motor when there is an Over-voltage or Under-voltage

Download Design files and Source code HERE!

SINGLE PHASE PREVENTER SYSTEM

FEATURES:
Switches of three phase supply when any Phase voltage dips below 200v
Switches of three phase supply when any Phase voltage rises above 280v
Switches system back on when voltages normalize
LCD to display STATE of system
Note*
Variable resistors in series with AC phases are to help simulate under and over voltages
Download Files Here!

AUTOMATIC BOOM GATE FOR TRAIN/ROAD INTERSECTION

FEATURES:
Shuts gate, turns traffic light red, sounds buzzer at start
Has four sensors all tied to the same 555timer
Uses PWM from Microcontroller for IR emitter
Has upper and lower limit switches to prevent gate from over shooting(these have to be activated manually during simulation)
Verifies to ensure that intruption is actually caused by a train(shortest train at highest speed determines shortest time that a train could possibly interrupt the sensor. Set to 5 seconds)
On detecting a train, Red traffic light comes on, buzzer sounds, gate closes
Note*
Red LED used in place of IR emitter(not available in ISIS)
Push button switch used in place of IR detector(not available in ISIS will have to be activated during simulation)
Download files Here!

DATA LOGGER

FEATURES:
Measures Voltage and Current values and logs them to EEPROM(bad idea)
Logs time and date together with measured values
 SETUP:
 At startup press INC key to set date, DEC key to set time
 In Date setup mode, press INC key to set year, DEC key to set month, AUX key to set day
 In Time Setup mode, press INC key to set hour, DEC key to set minute, AUX key to set second
 Use INC, DEC keys to increase or decrease values
Note*
Time may not be so accurate
Download Files HERE!

Automatic switch for indoor light(using human detection) and outdoor light(using photo resistors)

Component List:

• Resistors(3)
• AC source
• 5v battery/source
• Push button switches(2)
• Buzzer
• Light bulbs
• LED red
• LM044L display
• PIC16F877
• 1K  potentiometer
• RTD14005F miniature pcb DPCO relay
• DPDT switch
• Light dependent resistor
• ULN2003A

Features:

• System can be engaged or disengaged via start and stop buttons
• Implements a two way switching system with already existing switching system
• Immediately turns off outside light when the outside is bright enough, and on when place is dark.  Sensitivity can be carried with the potentiometer
• Automatically turns on light when person is detected in the room. 
• Sounds buzzer when person is not detected, and prompts person to move, just in case the PIR failed to detect person
• Turns of light after 10 seconds if no human is detected. This time can be varied in the code.

Download ISIS design file and code(.gcb, .hex,   .lst, .asm) here!

SINGLE PHASE AUTOMATIC TRANSFER SWITCH WITH OVER CURRENT PROTECTION USING PIC16F877

 FEATURES:

*May add frequency sensing

• Over current protection
• Over voltage protection
• Under voltage protection

Mode of Operation:
 The default source of power is the utility supply. In a situation where the utility supply voltage is below 210V or above 270V the system would start the generator and cut of the utility supply, provided that the generator voltage is also within the specified range. In a case where both sources are out of range, no power would be supplied until one of them comes into the voltage range.

The current sensor monitors the current drawn. When the current goes above 10A, the system is cut off completely, a message is displayed instructing that the fault be cleared and the reset button press afterwards.

The LCD constantly displays the Voltages of both sources, the current drawn as well as the states of both sources(whether they are on or off)

THE VARIOUS PARTS

Voltage Sensor:

 

Simple step down and rectification is used

Current Sensing:

Current is sensed using an acs712 current sensor from allegro

Power Sources:

Display Unit and Relay Driver:

Microcontroller:

Download Design files and Code here!

Microcontroller Based Automatic Three-Phase Change Over Switch

.......Work in PROGRESS!!

Features
Over voltage protection
Under voltage protection
Protection against Unbalance due to one or more phases going off
Etc etc.