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Questions tagged [capacitors]

The tag has no usage guidance.

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Testing a capacitor with a nodeMUC Lolin V3

Apparently it's possible to test the capacitance of a capacitor with an arduino. In this thread, someone tries to do the same on a NodeMCU but the conclusion is that it's enough to get the change in ...
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1answer
46 views

How would I go about powering addressable RGB LED light strip? [Arduino Nano] [closed]

The addressable RGB LED I have is WS2812B. I plan on controlling the LEDs via an Arduino nano. I have a total of 188 LEDs to supply power to. Would I require anything between the addressable RGB LED ...
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1answer
66 views

How can I power a NeoPixel ring and strip through Arduino MKR1000?

I currently have a MKR1000 which is connected to 1 ring with 8 neopixels, 1 strip with 20 neopixels, 1 microwave sensor, 1 speaker, 1 rotary encoder. I am running the NeoPixel positive and negatives ...
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1answer
66 views

Capacitors, Arduinos and Saving Data

In short, I have programmed and wired a speed/odometer and all is working well. However, I need to save data from the components/sensors once a power button is pressed, which has led me down the road ...
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1answer
523 views

How to keep a pin LOW for a small amount of time after pushing a button and while device is booting?

Context I keep the board in deepsleep mode and want to wake it with different buttons. I need to know which button has been pushed on boot. The board is immediately put back in deepsleep mode ...
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814 views

Fixing NRF24L01 with capacitors

Recently I have bought some NRF24L01 transceivers. I can't get them working (the connection is quite unstable and only works sometimes). I've found out in the internet that the best way to fix that ...
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1answer
1k views

Reading values from TTP229 capacitive touch sensor on arduino

I would like to be able to read the raw capacitive sensor values from a TTP229 chip through i2c in Arduino. I have one of these breakout boards to play with : My goal is to get values similar to ...
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4answers
614 views

Is the ShiftOut tutorial on the official Arduino website really wrong regarding the capacitor?

I'm talking about this tutorial "Serial to Parallel Shifting-Out with a 74HC595" from the official Arduino website. It provides the following schematic: I've read a couple of times now, that the ...
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2answers
648 views

Purpose of capacitors in this project

I'm currently working on a project where I am making a wheeled robot using the Hack-e-bot library on the arduino. The circuit board which I have planned to put together through soldering will ...
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1answer
251 views

Decoupling cap for self-powered LED matrix and LED strip

Should I add a decoupling capacitor to my RGB 16x32 LED matrix powered directly via the 5V pin? When I display a spectrogram, the current load is fluctuating quickly in the 100-250 mA range (on ...
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1answer
157 views

PWM water pump flow control - should I use capacitor for MOSFET? [closed]

I want to control flow level on 12V water pump with PWM pin, I'm using IRF520N MOSFET for that (and dedicated 12V power supply). Should I use some capacitor on MOSFET output to "smoothen" voltage? ...
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2answers
851 views

Correct Capacitors to use with L7805 Voltage Regulator

I am making my own arduino. I am in the process of hooking up power to the Atmega328. In both these articles they use the L7805 voltage regulator with two 10uF capacitors. https://www.arduino.cc/en/...
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1answer
97 views

Resistors/capacitor used in connecting 23LC1024 SRAM 1 Mbit

Yesterday I received by 23LC1024 SRAM with 1 Mbit memory. I tried to search for some libraries and ways how to connect it. So I searched around on internet first for the connections and saw some ...