15h
comment Why no self-hosted email? (Snowden, Lavabit, Hushmail, NSA)
@user2284570 yeah, it's a good idea to always have a local copy of your email (e.g. synced via imap) and assume that all cleartext email is subject to search by the security services. Only PGP or S/MIME can solve the latter.
21h
awarded Critic
23h
comment ISO27001 and Linux/Ubuntu
Ask them if you can run it in a VM.
1d
comment Is it possible to multiplex SIM cards using a CPLD?
You could take the IC as a starting point. That datasheet has reminded me that there are two different SIM voltages: electronics.stackexchange.com/questions/35358/… - which makes it a huge pain to drive. You might be better off with high-speed bidirectional analog switches in the data and clock lines.
1d
comment Is it possible to multiplex SIM cards using a CPLD?
ICs exist for this which may save you work: ti.com/lit/ds/symlink/txs02326a.pdf
1d
comment Is USB charging such a hard problem?
USB charging wasn't really properly specified and standardised until 3.0. Hopefully in a few years we'll all have smart chargers with C cables.
1d
answered Why no self-hosted email? (Snowden, Lavabit, Hushmail, NSA)
2d
answered What are the advantages of build scripts?
2d
comment Is it normal for a transistor running a motor to be very hot?
@SpehroPefhany the transistor fail, or the finger?
2d
comment Is it normal for a transistor running a motor to be very hot?
Try a 100ohm and then a 1k.
2d
comment Is it normal for a transistor running a motor to be very hot?
What resistor do you have between the arduino and the base?
2d
comment MOSFET Switching without gate voltage / LED Strip
Other way round: connect the gate directly (or via a small resistor of a few hundred ohms), and put the 10k between gate and ground. As Nick says, it picks a voltage from stray capacitance, the human body, static in the air, and passing radio waves.
2d
comment Is it normal for a transistor running a motor to be very hot?
You may be using too much base current: what base current and motor current are you using?
2d
comment MOSFET Switching without gate voltage / LED Strip
Connect the gate to ground. Does it turn off? "Disconnected" is not the same as "zero volts".
2d
comment Not congratulating a colleague because of her BSc final project
@MichaelHampton you are correct, this is the real issue that the app is not the thesis. When I did my degree, the code wasn't even a marked deliverable. The marks were awarded solely on the basis of a 10k-word document describing the work. I put a lot of time into the document and little into the code, and got a good mark and some nonworking code. The questioner might form a different opinion if he read the thesis itself, along with the university's marking advice.
2d
comment Is testable code better code?
Exactly. Consider the contrapositive. If it's untestable code, it's not tested. If it's not tested, how do you know whether it works or not other than in a live situation?
2d
answered Use an apostrophe to shorten word?
2d
comment Home automation protocols to use for wifi
Note: the reason people use zigbee and zwave is that wifi power consumption is far too high for long-term battery-powered devices.
2d
comment Solar powered charger circuit for a single LiFe cell
Have a look for matching application notes, such as ti.com/lit/an/slyt466/slyt466.pdf
2d
comment Solar powered charger circuit for a single LiFe cell
I'm not really sure what the 5V intermediate stage gives you. What size battery and solar cell are you contemplating?
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