raspberry pi

  1. Khisraw

    Accessing Raspberry Pi4 USB port with Python

    Hello All, I am using Raspberry Pi 4 which comes with 4 USB ports. For my project, I have two mics and both will be connected to Rsp via a USB port. I need to be able to choose which Mic needs to be ON. So basically I need to be able to switch/choose which USB port I want the sound to come in...
  2. Khisraw

    Audio detection with Raspberry Pi4

    Hi All, I am working on a project to detect sound from a mic and process that sound in Raspberry Pi4B. The Mic(Link below) has a digital putout. https://www.sunrom.com/p/sound-sensor-module-mic The Raspberry Pi4B doesn't have an ADC so, in theory, the Mic module should be ideal. The question...
  3. bibble235

    PiScope

    Looking to make a Pi Scope as described at https://www.instructables.com/PiScope-Raspberry-Pi-based-Oscilloscope/ I am happy with the building of it but currently do not know enough about electronics to not use the list of components on the site. I wondered when it comes to components such as...
  4. C

    Help Finding Relays to Buy for a Raspberry Pi

    I'm building a custom "wallbox" for my 1952 seeburg jukebox. This custom "wallbox" will be a Raspberry Pi inside the jukebox, which'll let me make song requested from my phone. The jukeboxes original wallbox sends song requests by rapidly pulsing a 48V signal (it gets 48v from the jukebox for...
  5. A

    The USB ports on Raspberry Pi 4 goes blank for a few seconds and returns back to normal

    Hey there, I'm using Raspberry Pi 4B and running OpenCV on it. I have attached webcam for video steam to detect objects using OpenCV, also, a mouse and keyboard. I'm facing a very unique problem here, when I run the python script containing the OpenCV program, it runs smoothly without any...
  6. Ethical23

    What devices/sensors do i need to monitor energy consumption on an app using an SBC???

    Should i use the Energy Meter or can i use a breaker?? I'm thinking about: Raspberry Pi B 4 AzureIoT (Cloud Platform) NodeMCU 8266 (Wifi module) I Know that in this case i need to used an AC to DC converter. Can you help me with this???
  7. yogesh nandurkar

    which OS is good for low boot in raspberry pi

    hi there, i am working on raspberry pi project. the project is to make GUI on raspberry pi. peripheral inbterface keyboard, mouse, LAn Cable. requirement is our raspberry pi should ON/OFF in number of times in a day and for that it should on within a second. i konw it is not possible in...
  8. E

    [help] LED matrix demonstration for climate change

    Hello! I'm a junior undergraduate pursuing a degree in electrical engineering and I have a project idea I've been doing some research on. I have some experience in mBED microcontroller programming and design (like PWM and serial connections). I also have some experience in PCB design and...
  9. D

    Step Down Circuit help

    So, I'm replacing my head unit with a raspberry pi4 and a touch screen. I plan to have a switch for running it off the car battery without a key. and some type of warning system to say if the battery is getting too low to start the car. The car would supply 12V 15 A on accessorie and 10 A...
  10. C

    How to extend serial communication on Raspberry Pi?

    Hello I would like to get distance data by attaching multiple lidar distance measuring sensors. like the picture below. However, the Raspberry Pi appears to communicate one-to-one with the sensors of the TXD and RXD. How do I configure my test circuit if I want to do serial communication...
  11. L

    With this power bank [output 5V / 2.4A] mainly for charging Phones and Tablets... Can power Raspberry Pi 3B+

    https://trust.com/en/product/21795-primo-powerbank-20-000-mah With this power bank ^^^ [output 5V / 2.4A] mainly for charging Phones and Tablets... Can power Raspberry Pi 3B+ [power supply output 5.1V / 2.5A] and Raspberry Pi 4,...??? In the worst situation, if Not working,... what may...
  12. D

    Using potentiometer to adjust volume on usb speaker

    So I am currently trying to build a multi-platform portable. I'm using a raspberry pi zero w. I have a USB speaker with its own audio card inside. I am attempting to use a potentiometer to allow volume adjustment. With the soldering points on this speaker board, I am unsure what to attach to the...
  13. E

    how to properly make a charging circuit -- 2s 7.4V to 5V 2A

    I have 2 18650 li-ion cells, each at 3.7v (in case you don't see the pictures, they are available here : https://raspberrypi.stackexchange.com/posts/121847 ) and this bay with this white connector I saw on youtube that depending on the length of the cell, we can know whether they have...
  14. noname1234

    Searching Transistor which transforms 3.3v to 12v (level shifting problem)

    Hello there, I am trying to control my ws2811 led strip with my raspberry pi 4. But unfortunately the strip requires 12v and the gpio pins of the raspberry pi can only provide 3.3v. Thats why I am looking for a transistor that can take 12v (I have a 12v powersupply) and switch it on and off...
  15. K

    Understanding power protection circuit in Raspberry Pi

    The attached schematic is taken from the Raspberry Pi drawing. I am trying to understand how it works and I am pretty much stuck with it. I guess the purpose of the resettable PTC fuse and the TVS diode is clear, being as overvoltage protection. It looks quite obvious that the transistors are...
  16. S

    Raspberry Pi Conversion of ADS1115 output to PPM

    Hi! How do you convert an ADC reading from an MQ3 sensor using ADS1115 to ppm? I am trying to measure the amount of alcohol. This is the link to the datasheet of the MQ3 sensor https://www.sparkfun.com/datasheets/Sensors/MQ-3.pdf . I am getting ADC values which ranges from 3000-4500 when not...
  17. hopalele74

    Is this a good way to dim a 5-inch LCD for my Raspberry Pi?

    Hi. I'm trying to make a DPI display to work with my Raspberry Pi. First, I searched around and found out that the 555 timer IC is a good way to control the brightness of the display. And since the background LEDs needs around 23V to function, I've included a step up converter. It's for a LCD...
  18. W

    Raspberry Pi triggers relay before power is turned on.

    I bought a relay like this today for my raspberry pi, and I am encountering a very strange issue. I connected the 5v output to the VCC pin, the ground to ground and a GPIO pin to the IN pin on the relay. I opened python and assigned 'led' to 'LED(15)', which is very standard. THAT triggered the...
  19. M

    Please help me with getting the values from the digital meter to raspberry pi

    I am doing a project on automating a hydroponic system to grow tomatoes. I need a TDS sensor to measure Total Dissolved salts. I searched a lot for a sensor but I was not able to find a sensor that satisfies my requirement. I need a sensor that can measure high ppm. But, the sensors are only...
  20. W

    What does the datasheet say about the relay?

    I'm busy with a project that uses a Raspberry Pi zero and a relay. I've tried 2 relays and neither worked. I'd like some help to understand how to choose the correct relay, as well as which one will work. First, I used this one: SSR-100DA. I connected the input to the Pi, and the output to my...
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