raspberry pi

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. D

    choose the right for grape sorting project with image processing ...

    hello every one i want to do the grape sorting project for some educational goals ... i doubt to which camera will work for that project ... any body can help me to choose the right camera pls ... the project will work like this youtube link
  16. nightcrawler218

    Which power supply to use for Raspberry Pi?

    As far as the official specifications are concerned an rPi can be powered with supplies from 5V to 12 V. Typical current for 5V supply is 2A. Total power required for an rPi is 10W roughly. I have two power supplies (5V, 2A) and (10V, 1A) which one to be used so that the pi dissipates less...
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