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Unanswered Questions

4,279 questions with no upvoted or accepted answers
6 votes
0 answers
300 views

Handling non-standard I2C read response lengths with Wire library

I'm trying to read from a Sam&Wing XW12A 12 channel touch sensor IC using I²C. The IC responds to an address read packet with 16 uninterrupted bits representing its state. However, since I²C ...
6 votes
0 answers
642 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 ...
6 votes
1 answer
156 views

Adafruit_LEDBackpack library interfering with analog input reading

I'm trying to do something I think would be simple. I'd like to read the input of a electret microphone board and update the Adafruit 24-segment LED Bar Graph. I got each individual item working ...
6 votes
0 answers
1k 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
1 answer
210 views

First Uses of Digispark can't get past upload error

Windows 7 (64Bit) Parallels VM on Macbook Pro running BigSur. Arduino version 1.18.19, Digispark ATtiny85 Micro USB. Loaded Boards Manager http://digistump.com/package_digistump_index.json and updated ...
5 votes
0 answers
529 views

Internet in ESP32 is not working with IPv6

I am using ESP-WROOM-32D in STA mode with Arduino IDE(2.0.5) ESP32 board(2.0.9). I am trying to do http post request with ESP32. Router that provides internet supports only IPv6. Here I am getting ...
5 votes
0 answers
196 views

Why does arduino use a PWM range of 544 to 2400?

I learned in school that typical servos use a simple PWM system to control a servo. To do this, we would generate a 1000ms pulse to put the servo at 0 degrees and 2000ms pulse to set it at 180 degrees....
5 votes
0 answers
1k views

How to set ESP32 RTC clock source

According to the manufacturer's link below, the default RTC timekeeping in the ESP32 is supposedly based on Internal 150 kHz RC oscillator. Apparently, there is another option called Internal 8.5 MHz ...
5 votes
0 answers
339 views

SPI between Master arduino and Slave arduino

How can I send the string from Slave SPI to Master SPI? I want to write code in Bare Metal. The problem which I am facing is I can't make out what will be my blocking function in Master SPI code when ...
5 votes
0 answers
2k views

Modbus TCP/IP using Arduino uno and ENC28J60 module

I have this project where I need a modbus tcp server that will host a series of sensor data for other modbus client devices to read. I use this Library by Andresoarmento This is the code i am using ...
5 votes
0 answers
2k views

Clion Arduino plugin: Error:Could not find Arduino SDK (set ARDUINO_SDK_PATH)

I am trying to setup CLion as my workspace for my arduino. I have installed the two Arduino plugins for CLion, generated a new sketch project, but I am getting cmake errors on opening the project. ...
5 votes
0 answers
7k views

Why is Wire.onReceive() called during requests?

I'm building a complex I2C-based networking protocol and have noticed that the Wire.onReceive() handler is called both for I2C read and write operations. When the master writes to the slave, it is ...
5 votes
1 answer
1k views

How to send HTTP requests to specific port using Ciao?

I currently have a working REST client on my Arduino, but the requests always go to port 80. How do I make it send the request to a specific port? This is my current code: /* File: RestClient.ino This ...
5 votes
0 answers
1k views

Manchester 433MHz Nano to ATTiny85

My transmitter is a Nano, the receiver is a Tiny85. I use a Logic Analyzer to check if stuff is moving, I can clearly see data coming in at the receiver. The receiver does not 'decode' the data, man....
5 votes
0 answers
409 views

DHT22 reading weird values

I just hooked up a DHT22 I had laying around in a parts drawer to test something and it is giving out some crazy wrong values, I am running the adafruit library's unified example and this is the ...

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