5
votes
Accepted
Is it possible to read a USB port directly?
No, at least not in any remotely modern version of Windows.
Accessing hardware directly requires kernel privilege level, which ordinary application programs don't have. Think about it. It has to be ...
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4
votes
How to transition from battery to USB in a microcontroller?
There are two possible options based on the limited infomation you have provided
Consider storing data in Non-Volatile Memory.
Use a LDO such as TPS73633 that can support wide input voltage range ...
- 7,135
4
votes
Is it possible to read a USB port directly?
It assumed that this question is a continuation from How to transition from battery to USB in a microcontroller?. It is also assumed that your goal is to collect data using a PIC micro controller and ...
- 7,135
3
votes
Accepted
Send sensor signals to WiFi network
I would keep the sensors passive as transponders to a house wide rfid radar scanner. Changes in the sensor would change the code on the rfid of the sensor, thus reflecting back a different ...
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3
votes
Preventing a DC motor from stalling
Considering that this is a class project, depending on what you use to control the DC motor, you might be able to use current limiting. The technique is called current sensing.
When a DC motor is ...
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2
votes
Why we use GPIO for embedded systems?
GPIO stands for General Purpose Input Output. Lets assume you want to generate a pulse at pin 39 as in the below image. So when you wire the pulse to pin 39 the underline software will generate the ...
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2
votes
What is the advantage of using GPIO pins as sinks instead of sources?
This also has a historic reason:
Early microcontrollers' GPIO outputs were designed as open-collector pins with pull-up resistor because the technology used back then (NMOS) did not allow a different ...
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2
votes
Accepted
Tuning PID Controller
There are two answers here. First answer is the theoretical one. It doesn't matter what static power you apply. You could apply any number. The reason is that the plot of y(t) that you end up drawing ...
- 2,656
2
votes
How to resolve Keil uVision 5.0 compilation errors?
On Keil uVision goto Project > Manage > Run-Time Environment. You will get a screen like the following.
Your device is not properly configure as indicated by the Red box. Click on the Device + to ...
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2
votes
Accepted
How to select a micro controller for a low power application?
The critical parameters depends on the application. Beside Low Power, other critical parameters need to be considered. These may include code size, serial communication ports etc. Below is analysis ...
- 7,135
2
votes
Send sensor signals to WiFi network
I think you won't get this done without some kind of processor and customized firmware to convert the sensor signal to a digital signal for WiFi transmisson. The dongle is a good idea, but it provides ...
- 151
2
votes
Accepted
Preventing a DC motor from stalling
When you bump the plate on a thread off the edge, the plate tilts, inertia of the motor drives the plate to a larger angle. Deformed plastic grips much stronger than what motor can move. To avoid this ...
2
votes
Accepted
Can the Processor Cores on SSDs be Used for General Computation?
Yes, but if you have to ask, no.
SSD controllers run firmware contained in flash memory: it is the same kind of memory used for the SSD. If you know how to re-flash the controller, and know what i/o ...
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1
vote
Preventing a DC motor from stalling
I think it's the effect of "tightening the screw", a lot of friction distributed over a large area. Even if the plate doesn't bend, it will still accumulate a bunch of tension, and as a ...
- 6,115
1
vote
How to measure signal period with Arduino?
I'd comment instead, but I don't have the rep so I'll have to answer.
By attaching an interrupt to the rising edge of your signal you can increment a counter. You read the counter every X ...
- 51
1
vote
Multicurrency Ultraviolet counterfeit scanner detection machine
Not all currencies have ultraviolet features. Of those that do, the features vary.
Any ultraviolet features are determined by the issuing authority and are also influenced by the material the ...
- 9,712
1
vote
Embedded C Programming
This response is based on RX130 Capacitive touch development board as shown below
IDE: e2Stuido v7.5 and above
Toolchain: Renesas RXC toolchain
Board: RX130 Capacitive touch development board
MCU: ...
- 7,135
1
vote
Conversion from LSB to mg not making sense for accelerometer
I couldn't add a comment (new to the forum) so posting in the answer section. Bosch has since acknowledged this to be an error and updated the datasheet's errata.
They have added a 3/2 factor to the ...
- 111
1
vote
What is this device?
It looks like the devkit associated with the NodeMCU community.
If you turn it around with the metal portion facing away from you it should say something like "devkit v1.x".
It's a developer board ...
- 111
1
vote
Accepted
What is this device?
There should be writing on the top (metal) portion and/or some silk screening on the bottom. Either an ESP32 or (more likely) an ESP8266. That should give you enough info to get started...
- 248
1
vote
Accepted
DLX assembly synthax
Basically, "Rn" means "the contents of register n" and "(Rn)" means the "data in the memory location whose address is in register Rn".
For memory access, you can also add a constant to (Rn), so 4(R8)...
- 12.5k
1
vote
RTC interface with PIC16F877A
Ok firstly calm down, everything has an answer. you say you read and write data from real time counter by I2C debugger but can not by microcontroller; MCU stands between LCD and RTC right? and there ...
- 11
1
vote
Send sensor signals to WiFi network
The cheapest option for you to consider would be to use Esp8266 modules. They technically cost 1 USD. You can import a bulk (lot) order from aliexpress to make it cheaper. For you command centre you ...
1
vote
Bread board for STM32
If you don't want to solder wires to the microcontroller contacts looking into STM32 expansion boards. They look something like the following:
The above one is called STM32 discovery shield. You can ...
- 7,135
1
vote
Bread board for STM32
Based on the image I believe that the GPIO pins are already mapped to 0.1" (2.54mm) male connector pins. If my assumption is correct you have few options
Use 0.100" (2.54 mm) Female Header such as ...
- 674
1
vote
Why not only GSM (3G/4G/..)? Why do we need Bluetooth, Wifi,etc...?
Several reasons but mostly bandwidth and speed.
It makes sense to keep all communication channels as short and local as possible. This reduces likelihood of interference, channel contention and cost.
...
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1
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Why not only GSM (3G/4G/..)? Why do we need Bluetooth, Wifi,etc...?
Several reasons.
Firstly: They're designed for different purposes. It's basically the same reason individual power tools are usually better than all-in-ones. Sacrafices in one aspect are used for ...
- 1,304
1
vote
What is the advantage of using GPIO pins as sinks instead of sources?
Early TTL outputs (those typical of 74xx00 series logic gates) were capable of sinking (creating a current path to ground) more current than they could source (creating a current path to VCC). If you ...
- 446
1
vote
How can electrical noise be isolated in an Embedded System?
With a 20 ms pulse width you really should not be using interrupts directly.
The usual thing is to have some timer generating periodic interrupts at maybe 250Hz or so, then if on two consecutive ...
- 251
1
vote
What are the pros and cons of using Zibgee over BLE or vice versa for IOT application?
The present technology is all about IOT i. e with millions of devices connected over internet. Zigbee and BLE are two types of wireless communication which is used for interacting between two or more ...
- 11
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