Project 46 : "Ding Dong" Infrared Door Sensor

 Testing mode

 38Khz transmitter circuit

38Khz receiver circuit

Testing video

Project 45 : Yamaha ECU Unit

Switching wiring box 

Yamaha engine 

 Yamaha and MCU(Arduino) unit

 Yamaha ECU Unit

 ECU and switching box

Engine placement

Project 39 : Electronic Piezo Vibrator


Piezo  fan blade model

 DC to AC Inverter Board

Inverter output waveform

Inverter output video

Testing inverter and piezo resonator

Project 38 : LED Driver Board

 Driver Board

LED Sets 

Test Setup

Test Video


Project 33 : GSM/GPRS Phone Modem


Mobile phone and GSM Sample

GSM/GPRS Modem test setup

Schematic sample 

AT Commands on screen

AT command testing video

Program codes

GSM SMS video