Add the locking Mechanism on the Motorbike Alarms

After making alarm addition of the touch sensor circuit of motor security, many readers ask me to add the locking mechanisms to this alarm. Thus, if the alarm has been activated, the alarm will keep activated even though the motor’s key is turned off. The addition of a locking mechanism like this actually is very…

Simple Serial Downloader for AT89S51/AT89S52

SDownldr.exe is a software to program a AT89S51/AT89S52 serially through the parallel port. This Software is included in the Microcontroller Project Circuit diagram for this ISP downloader is as follow: The Serial Downloader circuit above using the power supply from the parallel port. However, not all parallel port capable of providing enough current for this…