Unanswered Questions
94 questions with no upvoted or accepted answers
3
votes
0
answers
498
views
SPI communication between two Ethernet Shields (W5100)
I am a newbie to the world of IoT, I want to ask...
Is it possible to connect two Ethernet shields with SPI? And if yes, how can I codes them?
I have reference from http://www.gammon.com.au/spi and ...
- 31
3
votes
0
answers
640
views
ESP8266 and Arduino bidirectional streaming from and to a website
I was looking for some easy tutorial on bidirectional communication via ESP8266 connected to Arduino UNO. I want to send and receive strings from and to JQuery based website.
However, I couldn't find ...
- 109
2
votes
0
answers
577
views
Sending an image captured using ov7670 using arduino and serially transmit it to python
I am working on using an ov7670 camera module with arduino uno,capturing the image frame wise and transmitting the image serially line by line of each frame to python for image processing, however i ...
2
votes
0
answers
547
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Why can't an Arduino/ATmega328 act as an SPI slave at anywhere approaching the maximum speed claimed in the datasheet?
The ATmega328 datasheet claims a maximum SPI slave speed of Fosc/4. For a chip clocked at 20MHz, that would be 5Mbps.
However, my tests show that even with no processing whatsoever in the interrupt (...
2
votes
0
answers
103
views
Is a PWM phase duration set with OCR1A a reliable way to communicate values to other Arduinos?
I am working on communicating 4 switch states across multiple Arduinos using only one pin. It must be as fast as conceivably possible.
Currently I have a master Arduino reading all 4 switches (...
- 177
2
votes
0
answers
71
views
Problem displaying data sent from Arduino Mega to Arduino Mrk1000 using serial communications
I've been doing a personal project.
The idea of the bigger project is to feed my fish using a robot.
My specific problem is that I would like to see some data from the various sensors that I will be ...
- 3,198
2
votes
1
answer
994
views
Communication between two Arduinos using ENC28J60?
How can I connect and send data between two Arduinos using ENC28J60 ethernet adapters on both of them? Is there any guide or example code for me to take a look from or any library I can use to achieve ...
CommunityBot
- 1
2
votes
0
answers
133
views
SPI Arduino slave not recieving data correctly
Using an STM32L476RG Nucleo microcontroller board as the SPI master and an Arduino mega as a slave with pin 52 for SCLK, pin 53 for SS and pin 51 for MOSI on the Arduino. There is no issue with the ...
- 21
2
votes
0
answers
174
views
nRF24L01 +pa +lna link does not communicate
I’m trying to create a link between two nRF24L01 units. Each nRF24L01+-based module (purchased) is connected to Arduino Nano on a custom-designed PCB.
The printed wiring is per the hardware ...
- 61
2
votes
0
answers
2k
views
Real range of long range transceptor LORA RA-02 SX1278 with Arduino UNO
I'm working in a project where I have to send data from long distances (about 1 km) between 2 Arduinos UNO which are powered by computer's USB ports. The place is a small city with no large buildings. ...
- 21
2
votes
0
answers
496
views
why is memcpy of unsigned long killing my sampling speed?
I'm using a Mega 2560 to communicate with a mixture of analog (i.e. measured via analogRead()) and I2C based sensors. Sampled data is placed in a 16 byte array, then written to an SD card once a 512 ...
2
votes
0
answers
270
views
Creating PPM signal from 4 integrers
I am currently building a MultiWii based drone, I have built the emisor-receptor that interface 4 analog signals(4 potentiometers to control the drone) and it works perfect, the receiver(arduino Nano, ...
- 2,522
2
votes
0
answers
104
views
Can I configure pairing for HC-05 and Arduino, and use the HC-05 without Arduino after?
I have a system that is outputting data via its serial, and I need to relay that data to my PC wireless-ly. If I were to setup an Arduino and HC-05 at the system's side to relay the data, that would ...
- 21
2
votes
0
answers
92
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Unicast image transmission using Xbee
I've been working on image transmission using XBee S2B Pro modules and Arduino Mega. Main task is to transmit a jpg image taken by a jpeg serial camera at the transmitter and send it to a microSD ...
- 2,522
2
votes
0
answers
2k
views
Reading +IPD response from serial.read() using Arduino UNO and ESP8266
I have a python server running on my PC and I am using an Arduino Uno (wifi enabled by a ESP8266 chip) as the client.
I can make the the server and client communicate using AT commands as shown below:
...
- 21