Timeline for Need Help- Burglar Alarm System
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
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| Aug 18 at 6:24 | comment | added | Reva Kantaria | So I tried calculating the required base resistance using Ohm's Law. My PIR sensor has an operating voltage of 5-20 VDC, with output voltage of 3.3 V. And I got the base resistance near to 1.3 k. So a 1k base resistor can still do the job and ensure the transistor is saturated? | |
| Aug 17 at 20:35 | comment | added | Justme | @RevaKantaria An 1k resistor might work. Whether it is the best or not, and according to which definition of best, is completely another thing. And unknown. | |
| Aug 17 at 20:29 | answer | added | D.A.S. | timeline score: 0 | |
| Aug 17 at 19:21 | comment | added | Reva Kantaria | I'm new to this so I'm not sure which resistor is best for my needs. But as per my current understanding, a 1k ohm resistor will work best when connected in series? | |
| Aug 17 at 19:14 | comment | added | Chester Gillon |
In the schematic only one side of S1 is connected, and the switch therefore appears to have no effect. What is the intended purpose of the switch?
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| Aug 17 at 19:11 | comment | added | Reva Kantaria | Yea it has an inbuilt resistor | |
| Aug 17 at 19:09 | history | edited | Reva Kantaria | CC BY-SA 4.0 |
added 82 characters in body
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| Aug 17 at 18:28 | comment | added | Jens | Does this LED have an integrated resistor? If not, either the transistor or the LED will not survive. | |
| Aug 17 at 18:27 | review | Close votes | |||
| Aug 19 at 15:46 | |||||
| Aug 17 at 17:54 | comment | added | Russell McMahon♦ | Be sure that the PIR pin out is correct as shown. It looks different to normal- they are usually positive output negative or perhaps negative output positive.Yours may be as shown but maybe not.| Be sure that the transistor pin out is as shown for your verdion. You show top to bottom collector base emitter this can vary among models. | |
| Aug 17 at 17:50 | comment | added | Voltage Spike♦ | Can you post a schematic? | |
| Aug 17 at 17:31 | answer | added | Justme | timeline score: 1 | |
| S Aug 17 at 17:17 | review | First questions | |||
| Aug 17 at 17:50 | |||||
| S Aug 17 at 17:17 | history | asked | Reva Kantaria | CC BY-SA 4.0 |