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I want to set LED output hight (12V) when input from LDR and PIR sensor is hight only. how to use comparator with this circuit . Can I connect LDR and PIR to opamp? or I have to connect output from TR AND gate to opamp.
I connect LDR and PIR sensor to input of Transistor And Gate circuit and connect 4 LED 12V 1W to output . But LED is alway bright. when have no input from both sensor LED is little bright. So, I pull out input from LDR. when somebody pass PIR sensor it's more bright . And If have input from...
If LDR not dark then don't turn on LED of PIR Sensor. It like And Gate. I try to use circuit like this . I use LED 12V 1W 4 light so it is 4W. I test LED by connect to power supply it very bright. But when I connect LED to transistor 2N2222 in circuit it not bright. how to make LED very bright ?
I use LDR sensor for turn on LED when dark and I want to use PIR Sensor for check motion. If somebody pass the sensor then turn on more LED. And set all LED turn off when have light.
How to set condition turn on 1 LED if dark, turn on 2 LED if have motion and turn off all led when light...
I use LDR and Opamp automatic light like this image .
I want to connect this circuit with LED. So I'm not use Relay but I don't know how to connect LED instead Relay. I measure between pin C of BC549 and Vin it is 0V all the time. I measure pin C and ground it is 5V because Vin 5V to ground. I...
I want to connect PIR Sensor to ic 555 which output of PIR Sensor is logic "1" . But ic 555 will work when trigger pin change from "1" to "0". I want to use output of ic 555 to 12V. How to change input of 555 to work when input is logic "1" ?
LED blink 7 times when I press REC, PLAY button . It have no sound from circuit. when I press ERASE button hold to LED blink 7 times and I press REC button again it still blink 7 times as usual. How to use ISD1700 to record voice ?
I try to use ISD1700 like this **broken link removed** in page 16.
I want to use with microphone . I use Rosc pin 20 = 100k(ohm) . All Capacitor ceramic = 0.1uF. All capacitor electrolite = 4.7uF 25V. I don't use pin 2,3,17,27 not connect with anything. I don't understand how to connect...
I want to interface fpga Spartan 3 with SDRAM MT48LC16M16A2. but I'm not sure how to connect pin between SDRAM and fpga. I think FPGA don't care about pin because it can set pin in the VHDL compiler. I read SDRAM datasheet and see pin A0-A10, DQ0-DQ15. I don't know how to interface these pin to...
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