Unanswered Questions

4,224 questions with no upvoted or accepted answers
5
votes
0answers
72 views

nRF24L01 continuously reading closed pipe

I am testing communication between two nRF24L01 modules. The receiver is getting the transmitted message but is also continuously reading (null) data from a closed pipe? I am using the RF24 by TMRh20 ...
5
votes
0answers
614 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 ...
5
votes
2answers
7k views

DC Motor Speed Measurement using Rotary Encoder

I have written the following code to measure the speed of a unidirectional DC Motor.I have attempted to measure the time between successive interrupts in order to calculate speed. boolean check; ...
5
votes
1answer
1k views

Converting Arduino Uno with Ethernet Shield sketch for Arduino Yún

I'm new to the Arduino Yun and I'm trying to convert a sketch written for the Arduino Uno with a Ethernet Shield. The sketch does HTTP posts to Azure Mobile Services. I've added in the Bridge.h and ...
4
votes
0answers
487 views

Arduino WebSocket Client "Connection Failed"

I use this code to connect Arduino MKR1000 to API through Web Socket, but it didn't connect to the server. Can any one help me to correct the code. This is the Arduino code: #include "Arduino.h" #...
4
votes
1answer
5k views

Arduino Ethernet shield server and client at the same time

Hardware: Arduino Mega 2560 Rev3 Ethernet Shield Rev3 A sensor Goal: Take value from sensor, upload it to ThingSpeak. Host a web page on the Arduino. Question: I've done both things in the past. ...
4
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. ...
4
votes
1answer
570 views

Can I reuse crystal frequency of Arduino?

If I use some IC which requires clock frequency like 16MHz, can I take one from Arduino? Or this it too high frequency to travel to neighboring board?
3
votes
0answers
37 views

SD Card Initialization Failed, cannot add inactive module

Just to preface I am not that great at coding or anything and I am currently building sensors off of Oregon State University's Smart Rock sensor code, so the code I am being used is not mine. I am ...
3
votes
0answers
84 views

Send/Stream BLE (Bluetooth Low Energy) data with high data rate with Arduino

My project is to transfer an image wirelessly via BLE from my Sparkfun EDGE board using the Arduino IDE to another laptop. In the following, for simplicity, I have reduced the program to transmit ...
3
votes
0answers
66 views

Average of 10 readings, wrong

I am reading from loadcell and calculating the average of last 10 readings. But when the load cell reads something more than 3800 g the average gets negative, how? The mass I read are not negative ...
3
votes
0answers
60 views

Servo wont work with LED code!

I'm basically trying to combine my servo code and my LED code but whenever I add my servo code the LED refuses to turn on at all. I am super new to arduino sorry if this doesn't make any sense! Servo ...
3
votes
0answers
29 views

My LED display fails with MSGEQ7 output stuck

I have an Arduino setup with a pro-mini, a MSGEQ7, and a auto-gain mic. Even if I remove the audio input to the MSGEQ7 remains the same in the 890s (out of 1024). It's the same on each of two new ...
3
votes
0answers
91 views

How to adjust Partition Scheme Wemos D1 mini pro?

I bought myself a WEMOS D1 mini PRO (16MB) for creating a quite large project. As I'm writing code, my memory is starting to grow. When I looked at the Flash size in Arduino IDE, the only options I ...
3
votes
0answers
88 views

Black screen when using higher SPI-speed for RA8857 LCD-controller

I'm using an Arduino Due that talks via SPI to an LCD (800x480) with the RA8875 controller chip. The most recent datasheet I could find is: RA8875 datasheet. Everything works as expected when using ...

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