BreadBoard | Inversion of Control and Dependency Injection for Perl | Dependency Injection library

I'm making a project that requires an lcd, and the project was working fine on my breadboard for testing. I moved it to my final product, but now my lcd stops displaying text after a few minutes, or when the potetiometer value is too low. One thing that really gets my attention is that if the potentiometer is fully high, the lcd doesn't clear by itself. When I lower it, it happens again. I have a refresh rate in this project as well for about every 250 milliseconds. Here is the code for my project along with it's schematic.

schematic -

code -

I have assignment which have the following requirements: 10% Connect a button to a digital input 20% Connect a potentiometer to an analog input 20% Connect 3 LEDs of your choice to PWM outputs (place them in a row on the breadboard). See the pin overview (Lenker til en ekstern side.) for which pins support PWM 10% Read the value of the potentiometer ten times per second 30% Use the read value to set the brighteness of the LEDs. The lowest 1/3 sets the brightness of the first LED, the middle 1/3 sets the brightness of the second LED and the last 1/3 sets the brightness of the last LED. Meaning: Knob fully turned off = no LEDs are on. Turn it slowly and the first LED fades in as you turn, then the second LED fades in and finally the last LED fades in. 10% Holding in the button sets all LEDs to full brightness. Releasing sets them back to the potentiometer value.

I have managed to achive the LED_1 to fade up to in 1/3 and the LED_3 to fade correct at 3/3. The problem I am stuck with, is that I can't figure out why LED 2 wont fade correct? You can see my code below with a screenshot of the circuit designed in tinkercad. I havn't written any code for the button yet. Any solutions?

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.

I am working with a DragonBoard 410C using Android 5.1 and Kotlin to experiment with the GPIO pins on the 40 pin low power connector. The library I'm using is using the sysfs interface for interacting with the GPIO pins which requires opening various pseudo files in /sys/class/gpio/ directory tree and reading and writing values to those files, see accessing GPIO low power connector on DragonBoard 410C running Android

My understanding is that I can provision a GPIO pin as Input and Edge triggered which would allow me to wire up a simple circuit with a momentary contact switch and be able to detect when the switch is pressed.

However the documentation I've found indicates that I need to use the poll(2) system service or the select(2) system service on a file descriptor for the /value pseudo file of the GPIO pin I am using in order to detect when the Edge is detected, e.g. /sys/class/gpio/gpio910/value.

How do I use the poll(2) or select(2) system services with a file descriptor in Kotlin? Is poll(2) the same as ready() method of FileReader?

Perhaps something similar to the Java WatchService functionality is needed? http://www.java2s.com/Tutorials/Java/java.nio.file/WatchService/0060__WatchService.poll_.htm

What I am planning, unless this is the wrong approach, is to have a utility function, something like:

I'm trying to make a simple morse code in Arduino, using a breadboard, one buzzer and two buttons. When button1 is pushed, the output of the buzzer should be a sound signal for 200ms. If the other button (button2) is pushed, the output of the buzzer should be a sound signal for 400ms.

Also when button1 is pushed the program should print "." to the screen. Similarly, print "-" for the longer output.

This is my code:

So recently i started to learn C++ and Arduino. For my training i use an IC22 Display which I connected to my breadboard. I tried creating a simple countdown timer from 20 seconds all the way to 0. However I ran into a problem where the IC 22 Display would still display the number 0 everytime it the countdown goes below 10. So 9 would be 90 and 8 would 80.How do i remove the 0 from my display? Could someone check what is wrong with my code?

I am not sure why Qt is outputting this to me. The code compiles, and all the syntax is formatted correctly. I have tried looking at different forum posts, but I am unable to pinpoint the error.

I am currently testing with a breadboard, circuit, and light bulb; all the hardware works and I am able to capture a voltage in the Arduino software (I can add the Arduino code if need be).

The issue I am having is that I can't display a voltage in Qt. I am using an Arduino Uno and an Arduino Voltage sensor (VCC <25V).

voltage_sensor.pro

I am trying to communicate with a Vending machine using MDB Protocol with the help of Arduino Mega and I am partially successful in doing so.

The circuit that I am using is attached here

While the circuit diagram is shown below

The Arduino Mega is communicating with laptop via Serial 1 and the vending machine communication is done via Serial 2 of Arduino Mega.
USART is being use for communication.

The strange issue that I am facing is, the communication with the vending machine starts sending data only when brown colored wires A and B are initially not connected(which are connecting Arduino TX to Vending Machine RX). Once I see the data coming from Vending Machine, I short wires A and B and Arduino Starts sending data to the vending machine too.
But if Wires A and B are connected on the start of a vending machine, the vending machine doesn't send any data to Arduino and hence no communication takes place. I want to make it work without manually connecting wire A and B every time.

I have tried replacing Optocoupler PC817C with

• PC814
• 4N35
• 6N137 High Speed Optocoupler

I tried replacing Hex Inverter with

• 74HC04AP

I tried putting a mechanical and then solid-state relay between wires A and B and tried connecting them via external input but nothing happens
I tired adding an optocoupler as a switch between wires A and B and tried controlling it via firmware.

I even tried replacing the hex inverter with hex buffer HCF4050BE and a NOT Gate but regardless of any combination of mentioned components the issue remains the same, it only works if Wires A and B are initially not connected and then shorted once data starts coming from the vending machine.

I am using MateDealer's code.
I want to automate this manual process and need a simple solution for that.

I have been on this issue for more than 3 days now after I got my SSD1306 I2C in the mail. I have a Tiny Programmer from Sparkfun, which I use with a breadboard.

This is my pin layout: pin2-->SDA, pin3-->SCL. The documentation on the SSD1306 Arduino library states that I have to use these pins even though I know the SDA is pin5 and SCL is pin7. The power and ground are being jumped to the OLED from the Tiny Programmer.

The main issue I am having is that the OLED is not coming on or displaying the text.

The code I am using for this is: