Unanswered Questions

3,369 questions with no upvoted or accepted answers
10
votes
1answer
2k views

Update Dynamically Tkinter Widget Scale from Arduino Ports using python and firmata

I'm having trouble trying to get Arduino digital ports values and set these values into a Python Tkinter Widget Scale. I'm using Python and Arduino with Firmata. I'm able to access my arduino board ...
8
votes
5answers
2k views

Fluctuating readings of LM35 temperature sensor (+- 5°C) with Arduino UNO

I am trying to read a LM35 temperature sensor with Arduino UNO which I got as a gift. The issue is the fact, that my readings of sensor are, well, suspicious at least - they jump with each reading ...
5
votes
1answer
203 views

Working with multiplexers for constant voltage output

I'm working on creating a circuit where I'm trying to have the ability to switch multiple strands of LED rope on and off at a time using an Arduino and a multiplexer. With my current configuration, ...
5
votes
2answers
957 views

How can an Arduino Mega 2560+Wifi Shield 2.0 (SeeedStudio) receive data from database in a XAMPP server on my PC?

I'm trying to connect my Arduino Mega via Wifi to my XAMPP server. My main objective is get a value from my database and store it on a variable in Arduino code. With this new variable I'll be able to ...
5
votes
1answer
1k views

Leonardo-based tachometer?

I'm new here. I'm not a native speaker, so pardon my English. I just received my Arduino Leonardo today. I tried some basic calculations and stuff like blinking and LCD interfacing. Its interesting. ...
5
votes
1answer
2k views

Can an Arduino act as a GATT Server (Bluetooth LE)

I know it's pretty standard to set up an Arduino system as a BLE client, and use something like an app running on a smartphone as the GATT server, which receives the data and does something with it. ...
4
votes
1answer
997 views

Flash String Helper object as variable

So I have a Bunch of commonly used char arrays to build commands in my library. So to preserve memory, I have them put into flash, via PROGMEM ext, typedef const char PROGMEM ProgChar; ProgChar AT[] =...
4
votes
4answers
659 views

Thin battery to power arduino micro with nRF8001?

I'm building a project which needs to fit in a wallet. I have an Arduino Micro hooked up to a nRF8001. I attempted three button cells wired in series, which provided a solid 7.5 volts, but only 20mA. ...
3
votes
0answers
62 views

Weird Arduino Code Problem

I'm currently getting started with Arduino, so I do not have very much knowledge. In this project I have a receiver and a transmitter with 2 buttons. So, I'd like to switch something to on, when I ...
3
votes
0answers
68 views

Ultrasonic Flowmeter Using TDC-GP22 and Arduino Uno

I'm working on a project of Ultrasonic Flow Meter with TDC-GP22 using Arduino UNO. I used the library of leokoppel In my code,the configurations of the registers are copied from the Application Note ...
3
votes
2answers
252 views

Maze solving robot turning failure due to sensor distance to the corner increasing during the turn

At my school we have a project where we have to make a robot that can solve a 3D-maze using an arduino controlled robot that uses ultrasonic sensors to determine how to turn. The robot may not be pre-...
3
votes
2answers
902 views

SIM800L and Arduino Sleep - getting whimsy Serial output after 5 calls

i'm working on project where i'm trying to achieve that arduino parse caller ID so i can use it later to send SMS with sensor reading data. Somehow i made that code (with much googling) and it works ...
3
votes
2answers
610 views

DS1307 Real-Time Clock

I am trying to make an Arduino project based on the Sparkfun DS1307 RTC (real-time clock). There are a few issues with how Arduino libraries don't support checking if the Arduino board has been ...
3
votes
1answer
5k views

Uploading Arduino code, OTA, via connected ESP8266-12E running Esp-Link

1. A short preliminary introduction I'm deploying a small network of three MEGAs connected trough an RS-485 bus. Each MEGA is connected to up to 16 push-buttons (wall-mounted) and two relay-module (...
3
votes
1answer
1k views

Encoder + Bounce2 Library

I am working towards debouncing my keyes rotary encoder using the Bounce2 library found here ( https://github.com/thomasfredericks/Bounce2 ). I believe the problem lies in my code as there isn't much ...

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