Questions tagged [security]
The security tag has no usage guidance.
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How to add more lights and sirens to motion detector
I have a motion detector size of a cigarette box that rings bell or simple song when activated using a small remote control. We turn it on after closing the business to go home. We've had many ...
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Breaker with alarm
I am thinking about a theft alarm for an HVAC condenser. The condenser is installed outside and subject to burglary. I think a viable approach is detecting when it is detached from power.
The HVAC ...
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Pin-based security chips for Arduino?
These cryptocurrency wallets like Coldcard can be unlocked by a simple PIN, and are fairly safe. I believe that they use a security chip that stores information and only delivers with the right PIN. ...
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How do I protect the power supply from a short circuit inside a device?
I'm working on an electronics project which would be powered by a 12V power adapter.
I'm worried that in a case of a short circuit inside the device I'm making, the adapter could catch fire. Every ...
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Security device for camera sensor?
I am currently designing a raspberry pi interface board and while I was looking at the documentation for MIPI CSI camera ports I bumped into this sentence:
Camera sensors supported by the official ...
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LS7220 passcode IC
I bought the LS7220 IC which is designed to check passcodes.
For some reason, the pin 8 Lock Status Output does not illuminate the LED when I connect the power, and when I bridge the VCC in sequence ...
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LS7220 IC question for HIGH and LOW
I am learning about the basics of electronics.
I bought an LS7220 chip for a keypad lock, but using it turned out more difficult than I expected. I have attached it to a 9v battery at pins 9 and 14, ...
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A few questions on PIRs and other motion detectors
I grew up incorrectly believing that motion detectors (as part of burglar alarm systems) were designed to detect movement, when in actual fact it is the movement of a heated (like body heat) object ...
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Why does Intel's CCA (USB3 JTAG control scheme) not let a remote attacker own any system with a flash drive plugged in?
JTAG lets us read / write the architecture states on a CPU core. Intel's CCA let's us connect to JTAG with a USB3 port. So why could an attacker not execute code to trick a flash drive plugged into a ...
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Why do fire and security systems run at 27.6 V?
I have been looking at buying power supply units for a project, and I keep seeing supplies that output 27.6 V. It's an unusually specific number, so what they are used for, and why is it important ...
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Reverse engineer this old burglar alarm panel
I took apart an old magnetic door alarm, where when the contact is broken it counts down from 10 seconds for the user to input the code (which ranges from 1 to 8, there is no 0 or 9 key). This alarm ...
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GFCI outlet vs centralized differential circuit breakers
In North America, I'm told GFCI outlets have become common. They have an individual differential circuit breaker built-in.
In the European Community, differential circuit breaker are (mandatorily) ...
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Randomize PCB trace generation with Altium Designer
We are trying to create a tamper mesh as a flex PCB. This tamper mesh will consist of around 10 signal traces in order to detect a tamper.
One crucial point is that this tamper mesh should be ...
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SRM32H743 signed DFU updates
I want to implement signed software updates to my MCU. It is connected via USB and I am using the USB DFU to upload a firmware to it.
I want only signed firmware to be allowed to be uploaded to the ...
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how to make an obfuscated network cable
(EDIT): forest for the trees
This is why I love StackExchange! I have several great ideas to try, none of which were my original.
I asked here based on an assumption I probably shouldn't make: my ...
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