New answers tagged raspberry-pi
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I tried two ways: with a pre-programmed SparkFun OpenScale and with a custom circuit with Arduino Nano. Both ways do without the Sense cables, which serve for more accurate readings. They also use 5V instead of 10V, which reduces precision but seems OK for my application (see Elliot Alderson's answer for an excellent guidance on calculating precision and the ...
2
Beware poorly-described web pages...there are fatal flaws in this circuit.
Transmitter fatal flaws
PWM signal into the transistor base should switch the transistor ON and OFF, acting as a switch. PWM frequency should accurately match the piezo resonant frequency (perhaps near 40 kHz). In this circuit, the transistor is ON all the time. Try it with the 10K ...
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This datasheet can be a bit confusing, but I have figured this out.
Here is the format of the Write Register command:
The actual command is 0x60 (bits abc zero as recommended in the datasheet)
From page 18:
The argument for the volatile memory access commands (RR/WR) «abc»
should be set to 0x0h, in order to get normal read-out and write of
the ...
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Just saw your edit, I'm gonna write a reply anyway.
It is probably due to your power supply and/or ground loops which inject noise into your circuit.
Make sure you are using an isolated supply and that the operating frequency is out of audible range (although it's not always easy to know as the control may change frequency upon the current drawn).
Avoid ...
2
Technically yes, it is possible to get the Zero to wake a computer over a USB connection. However, you need to have the Pi-Zero version 1.3, because earlier versions didn't have ID pin connection and didn't have reversible VBUS hardware, although there are hacks that can reverse the USB port in older models.
To get the Zero to wake up a computer, you need ...
1
According to schematics, the setup you have made is not okay \$V_{REF1}\$ cannot be higher than \$V_{REF2}\$.
below is the typical application. In your case,
\$V_{REF1}\$ = \$3.3 V\$ and \$V_{REF2}\$ = \$5 V\$
from datasheet:
To support translation, \$V_{REF1}\$ supports 1.2 V to \$V_{REF2}\$- 0.6 V. \$V_{REF2}\$must be
between VREF1 + 0.6 V to ...
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With Scott's recommendation, I'm going to try adding the level shifter and see how that works out for me. Above schematic is with the added level shifter.
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I recommend using a COTS System on Module (SOM) to help with your problem. A SOM (sometimes called Computer on Module--COM) is a small board that has all of the essentials like the processor and supporting ICs as well as some connections to an external carrier board.
In my experience, it is much easier to design a carrier board and develop custom software ...
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Bit of background first:
Generally, USB itself is not a bus over which a device can be really woken up if it stopped working completely, because it's a host-polling based bus, i.e. the host PC must inquire the keyboard in regular intervals. If that host is completely shut down, nothing one can do.
However, being a host for a USB keyboard is relatively easy,...
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You must change the level shifter. The XU4 is very picky. I had a level shifter very similar to your - probably exactly the same, but mine has blue pcb - and couldn't make it work. Then I bought the proper one and things worked at first try.
There are plenty shops both in EU and US, if you can't buy in Korea.
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+1 for the Clear question, associated data and response for queries in the comment.
Can I power a Raspberry Pi with \$24V\$ through a TLE4271?
Let us look at some tables in the Datasheet.
The TLE chip comes with several features. Do you need all of them? Do you have many TLE in stock? anyways, let us see whether...
The TLE can supply sufficient ...
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The IRFB3006PBF should work fine although it's QUITE an overkill, pretty sure the datasheet you linked is for a different transistor though (that one should work fine too and I think that's the one you meant to ask about). The graphics in the datasheet should help you determine how much current can the the unloaded transistor pass at a given GS voltage, in ...
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RC car ESCs are designed to work with RC car transmitters, most of which have a 'trigger' that is pulled to go forwards, pushed back to brake, and pushed back twice to go in reverse. The neutral position is part way between full reverse and full forward, but may not be in the center because the driver might want more forward than reverse. The neutral point ...
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