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Monday, 29 October 2012
Bidirectional Visitor counter
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Wednesday, 10 October 2012
Automatic Bathroom Light
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Regards,
Ganesh kashid
MAX Technologies
Project : : AUTOMATIC BATHROOM LIGHTS
This simple circuit can be used as an automatic bathroom lamp controller. It disables the bathroom lamp at daytime and enables it at night. The circuit is built around a light-dependant resistor (LDR1), reed switch (S1), two transistors BC547 (T1) and SK100 (T2), a 12V 1-change over (C/O) relay (RL1), a step-down transformer X1 (12V-0-12V, 250mA secondary) along with some discrete components.
The working of the circuit is based on the opening/closing of the bathroom door. When the bathroom door is closed, magnet comes near the reed switch and shorts its terminals. Both transistors T1 and T2 stop conducting, and neither relay RL1 energises nor CFL lamp (B1) glows.
When bathroom door is opened, magnet moves away from the reed switch and opens its terminals. Both transistors T1 and T2 conduct, relay RL1 energises and CFL lamp (B1) glows.
When bathroom door is opened, CFL lamp (B1) remains on. After entering the bathroom do not close the door completely. If the bathroom door is completely closed, lamp (B1) is switched off.
During daytime, lamp operation is not necessary due to the presence of sunlight so LDR1 is used. Fit LDR1 near the bathroom window where it can receive sunlight (reflected sunlight is enough). At daytime if you open the bathroom door, resistance of LDR1 reduces and keeps both transistors T1 and T2 in cut-off state. Relay RL1 does not energise and lamp remains off.
At night, if you open the bathroom door, resistance of LDR1 is high, which keeps both the transistors T1 and T2 in conducting state. Relay RL1 energises and lamp (B1) is switched on. The power supply required to operate the circuit is derived from transformer X1.Like Us on FACEBOOK
Friday, 9 March 2012
Wednesday, 7 March 2012
Serial AVR ISP ( In System Programmer) Simple
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| My Prototype |
This is a very simple and easy to build programmer for Atmel microcontrollers from AVR family. The microcontrollers must support serial programming. This programmer is connected to a PC through the RS232 serial interface and can be used with the PonyProg.
Description of the serial programmer
The programmer is quite simple and it is based on the SI-Prog from the author of PonyProg software. The Zener diodes D2, D3 with the resistors R2, R3 reduce the voltage from the ouput pins DTR, RTS on the serial port to around 5V which is suitable for microcontroller (MOSI, SCK). MISO signal is connected directly to the input CTS pin. The Zener diode D1 with the resistor R1 drive the NPN transistor T1, which controls RESET signal. The AVR microcontrollers are in reset when the signal has low level. The resistor R5 works as a pull-up for reset signal. The resistor R4 helps to close the transistor T1. The programmer has standard 10 pins header.
Using PonyProg 2000
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| PonyProg I/O Port Setting |
When you want to program your microcontroller with the PonnyProg2000 you have to setup the program as you can see on the following picture. You have to select chosen COM port, where is connected your programmer.
Circuit Schematic
Schematic of the serial programmerIf you Wanna Buy it From Me then Just Leave me a mail.
And if wanna do it yourself and if need any PCB layout File Or any Query Just feel Free to Ask me
Thank you
Regards,
Ganesh Kashid
maxtechnologies.mumbai@gmail.com
www.max-technologies.webs.com
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