ultrasonic | Final project | Messaging library
kandi X-RAY | ultrasonic Summary
kandi X-RAY | ultrasonic Summary
An ultrasonic encoder / decoder for Python. Final project for COS597G.
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Top functions reviewed by kandi - BETA
- Play a chat
- Generate a bit frequency
- Convert a string to a sound list
- Close the stream
- Encodes a sound
- Encodes a string to a wav file
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Trending Discussions on ultrasonic
QUESTION
I'm working on a project for my computer science class. I've attached a camera and a distance sensor to my raspberry pi. the basic idea of the program is that that the pi will get a reading from the motion sensor and then depending on the reading it will take a picture with the camera and display a different camera effect and then keep updating the distance and the pictures on a loop.
My problem is that it will get stuck on the first camera effect that is activated, what I mean by this is if the distance sensor doesn't detect anything it will take a picture with no effect, if it picks up a closer reading it will display a negative, but if it doesn't detect anything initially it will continue to take pictures with no effect no matter what the reading actually is.
It also works the other way around as in if it detects something close it will continue to display a negative picture. I'm assuming what I did wrong has something to do with how I set up my loops.
...ANSWER
Answered 2021-May-21 at 17:58Try this:
QUESTION
How to find the time between events in a group?
For example, I have Streaming Source (Kafka) from which I get many columns. This stream is read into spark, preprocessed, cleaned and only these four columns are kept: "ClientTimestamp" ,"sensor_type", "activity", "User_detail".
Now, I want to calculate the total time for which the critical activity existed for each user.
...ANSWER
Answered 2021-Apr-12 at 07:32It looks like this could be solved by taking the difference between the maximum and minimum time for each User_detail within the Window. Also, a filter on the activity can be applied to ignore "normal" rows.
I do not see a reason why applying a custom function such as "calculate_time" is required here. Please note, I am not completely familiar with Python syntax, but your code could look like below:
QUESTION
I am beginner in Linux device driver. I am trying to implement a device driver for ultrasonic sensor (HC-SR04) using Raspberry Pi 4B with following details:
- OS : Raspberry Pi OS ( Raspbian GNU/Linux 10 buster ) ( version = 10 buster )
- Linux Version : Linux raspberrypi 5.10.20-v7l+ armv7l GNU/Linux
The problem now am facing is to create a microsecond delay for the trigger of sensor and also need to find the duration in microseconds of the ECHO signal. I tried with usleep() but it gives me implicit error which I couldn't solve even after trying the methods (like adding #define _BSD_SOURCE) explained in other forums. On searching it was found that jiffies are not able to give microsecond precision. The clock() function or sched_clock() both kept on giving errors.
It would be really helpful if any of you could suggest me a way to implement microsecond delay and count in device driver.
Thank You in advance.
[SOLVED]
udelay( ) solves the issue of microsecond delay with header linux/delay.h .
Another issue was of finding duration of a process in microseconds, which was solved by the following codes
...ANSWER
Answered 2021-Mar-09 at 10:10udelay() should be the function you are looking for.
usleep() is a function from the standard library and therefore not usable in kernel space. You will have to use linux timers. Refer to the documentation for more information.
QUESTION
I am using Sonic Pi 3.3.1 on my Windows PC and a Python script(Python3.7.2) on my raspberry pi(Raspbian Buster) that detects distance from an HC-SR04-Ultrasonic Sensor .The program then creates a tune with a pitch that ranges higher if the object is further away, this tune is then sent over OSC to Sonic Pi. External OSC is enabled on my windows PC. I also checked the Port and IP addresses, and they are correct.
I have tested my circuit extensively and I can confidently say this isn't the source of the problem, and that I added it for documentation purposes only at the bottom of my post for anyone who is interested, so I will move on.
My Python code:
...ANSWER
Answered 2021-Mar-04 at 14:40The problem is in the Sonic Pi que path, that receives the note from the python scipt over a UDP connection.More specifically it is in the sync statement of the que path. The sync statement is missing the senders Ip address and Port which is necessary when using multiple computers unlike in a local environment
You can either explicitly mention the Ip address like so:
QUESTION
I'm creating a drink dispenser that needs 6 ultrasonic sensors (HC-SR04) as shown in the image to check whether the user has placed their cup in the right spot. However, I do not have enough digital pins on my Microcontroller to connect the trigger and echo pins of all of them.
This is what the general code for these sensors looks like.
My question is, can I use the same line to connect all the trigger pins for the ultrasonic sensors as shown in the diagram? Or do the trigger pins have to be separate?
Theoretically, to me it should work, because all I need is the echo value of the sensor next to the right drink that they have chosen.
Is there a more preferred way to use less pins instead? I need 6 digital pins for 6 relays connected to motors
...ANSWER
Answered 2021-Feb-24 at 01:53generally, it is best to have a unique pin for every interrupt so that you can set up a unique ISR for each pin.
in this instance, as every sensor is identical, it should be ok. you might want to check that it is ok to connect all the outputs of the sensor together though, if one output is low will that cause a short if the others remain high?
if that's fine then you will need to add a bit of code that will basically loop through each sensor to see which one has caused the trigger
also, you will need to identify the sensor that has caused the trigger and make sure that it is reset as soon as possible after the trigger event. if not, the Arduino could miss another trigger event from another sensor if the first sensor isn't pulled high
QUESTION
I need to make this object following robot which uses 2 servo motors to move and a ultrasonic sensor to detect where objects are and where the Arduino should tell the servos to move. But, the problem seems to be that whenever the servo motors are trying to move forwards or backwards they just keep spinning. I've tried to check for loose wires but no wires seem loose, I've tried changing how I write the code but nothing has seemed to work yet...
Also here's some relevant code (not all):
...ANSWER
Answered 2021-Feb-03 at 08:20As paddy already pointed out your movements take very long.
The nested for loops will call delay(15) 181*181 times. That's 32716 times 15 milliseconds. A total of 8.2 minutes.
Another problem with your code is that you expect the servo to return from 180° to 0° within 15ms which is not going to happen.
Also don't need to call myServo1.write(pos) in the inner loop as pos is only updated in the outer loop. That's a total of 32580 uneccessary function calls.
You should learn how to write non-blocking code. There are plenty of resources available.
You might also develop a habit of checking your maths. Don't just delay. Think about what it actually means to delay 181*181*15ms!
QUESTION
Assume I have a STM32F4 with a system clock 8MHz, and time(TIM3_PSC = 39). I'm interfacing the ultrasonic sensor HC-SR04
I'm doing timer interrupt and would like to calculate the distance and the MAX distance that can be calculated.
So my work is : 1/8MHz * TIM32_PSC = 0.000000125 * 40 = 5uS is the timer period.
assuming the following code:
...ANSWER
Answered 2021-Jan-28 at 20:14I still don't understand what do left & rigth stand for in your code but here is the the way how I would implement it:
- Configure the timer in capture mode with 5 us ticks (or some other value). Don't start it. Enable capture and update (overflow) event interrupts.
- When you want to make a measurement, reset timer counter & start timer & trigger signal transfers (in case of multiple sensors, start all of them at the same time)
- Wait for capture event interrupts. This should work same for multiple channels (for multiple sensors).
- For each capture interrupt, get the corresponding CCR register value as
capture[n]. - Let the timer run. It will trigger the update (overflow) interrupt eventually.
- In the update (overflow) interrupt, look for the channels that you didn't get capture interrupts. The ones you didn't get interrupt are out of range. Stop the timer in update interrupt.
- For each captured channel,
distance = (capture[n] * 5) * 10^-6 * 340in meters.
QUESTION
There is a set of data that comes dynamically from the server and looks like this:
...ANSWER
Answered 2021-Jan-19 at 06:46QUESTION
I am new to pybricks and have found very little documentation to help answer my own query. I have written what I thought would be a simple program to spin my robot on the spot until the UltrasonicSensor sees something. It will then push forwards. If it is pushed backwards and sees a black line, it should try and swing out of the way.
The following code "works", but it's response to the Ultrasonic and Light sensors is significantly delayed:
...ANSWER
Answered 2021-Jan-13 at 09:01ev3.speaker.say(text) synthesizes speech as it goes. This is fun, but it is very slow. This is especially noticeable in a control loop like yours.
I'd recommend using ev3.speaker.beep() instead. You could even select the frequency based on the reflection value so you can "hear" what the sensor "sees".
QUESTION
I am currently working on a ultrasonic sensor (and Temperature but that is not important for this question) on my raspberry Pi, This is how I got it set up due to space constraint I am unable to use a breadboard. I have used the ultrasonic sensor before on a Arduino and it was working perfectly fine but I am new to raspberry and python coding so please do correct me if there is anything wrong with what I am doing.
Edit
Yes, I did solder the resistor to the Raspberry Pi it self as the board is only used for this function.
Below is the script that I am using to calculate the distance, it takes the reading of the last 10 value and calculate the average of said values.
...ANSWER
Answered 2020-Nov-27 at 04:14so after doing some troubleshooting on my part I have found that the solder on my resistor to on the raspberry pi board was not soldered on properly, so I after giving it proper solder, it was giving consistent readings now but the issue with high value did not change. it will still give high value so what I did to work around this problem is by having a filter, to filter out high value.
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Install ultrasonic
You can use ultrasonic like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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