Questions tagged [capacitors]
The capacitors tag has no usage guidance.
16
questions
-3
votes
1answer
54 views
Serial communication stops when powered with batteries?
Circuit explanation-
Arduino Uno connected to multiple sensors and to 16 x 2 LCD.
Uno's TX pin to ESP-01 RX pin.
Uno has been programmed to read values from sensors and display them on LCD along ...
0
votes
2answers
71 views
How to safely remove arduino nano from breadboard? [closed]
I did some prototyping with arduino nano in breadboard. And then after i done with the design, I was gonna implement it in a printed pcb so i need to remove the nano from breadboard. And this is when ...
-2
votes
1answer
76 views
What should the cut-off frequency be? [closed]
To convert a PWM signal to a DC voltage it must be filtered with a low pass filter. How can you know which cut-off frequency should be used and how do you calculate the values for the resistor and ...
2
votes
2answers
501 views
Why is AREF connected to a capacitor in the Arduino Pro Mini Schematic?
I'm currently looking at the Arduino Pro Mini schematic and have noticed that the pin AREF (analogue reference) is connected to a 0.1uF capacitor as shown below:
I have done some research and read ...
0
votes
0answers
59 views
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 ...
0
votes
1answer
76 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 ...
0
votes
1answer
112 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 ...
0
votes
1answer
72 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 ...
0
votes
1answer
822 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 ...
0
votes
1answer
2k 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 ...
3
votes
4answers
946 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 ...
1
vote
2answers
1k 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 ...
1
vote
1answer
290 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 ...
1
vote
1answer
208 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? ...
1
vote
2answers
2k 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/...
1
vote
1answer
120 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 ...
