Unanswered Questions
193 questions with no upvoted or accepted answers
4
votes
0
answers
718
views
ArduinoDue - Matlab: SerialUSB.write() sends ASCII?
I'm trying to get some binary data from an Arduino Due to Matlab.
Basically this is the setup:
Due:
byte usbMsg[33]= {0};
// filled with dummy as example
usbMsg[1] = '00000001';// in[3];
usbMsg[2] =...
- 2,522
3
votes
0
answers
204
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 ...
- 155
3
votes
0
answers
713
views
Getting atsam3x8e (Arduino Due) to work
I decided to make a pcb based on the atsam3x8e (microcontroller used in Arduino Due). For the design I copied most of the layout that I found on this site and looked at the official Arduino Due ...
3
votes
1
answer
2k
views
Creating a sine wave with a DAC and feeding it back
I want to produce a digital sine wave, send it to DAC0, and then receive it back as input on A0 and plot the graph. I am using an Arduino Due. I wrote the following code:
#define maxSamplesNum 120
#...
CommunityBot
- 1
3
votes
0
answers
378
views
Connecting Arduino Due's DAC output to pc sound card with protection
I would like to connect the DAC outputs of my arduino board to my pc sound card input so that I can use my sounds card as an osciloscope.
I have two questions:
1- if I don't use an amplifier, how ...
- 241
3
votes
0
answers
129
views
Reading Reveive Hold Register from USART in SPI Mode on Arduino Due
Sending with this function here works fine:
uint16_t usart0spiTransfer16(uint16_t spiMessage16) {
uint16_t sdo = 0;
byte firstByte = spiMessage16;
byte secondByte = (spiMessage16 >> ...
- 2,522
3
votes
0
answers
242
views
Why doesn't PWM work on arduino in this code?
I am trying to control a dc motor speed with PWM. When I test it with simple program like spin in one direction with set PWM value it works. If PWM>70 the motor will start spinning and max is 255.
...
- 2,522
3
votes
0
answers
323
views
Arduino Due upload firmware issue
I have Arduino Due on SAM3x8e. I'm on Ubuntu 14.04. Before today I uploaded firmware via terminal using those commands:
$ stty -F /dev/ttyACM0 speed 1200 cs8 -cstopb -parenb
$ /home/q/apps/devel/...
- 151
3
votes
0
answers
883
views
Arduino Due native programming port
Arduino does not recommend to program the Due board via Native port as it is not reliable:
If the MCU crashed for some reason it is likely that the soft erase procedure won't work as this procedure ...
- 111
3
votes
0
answers
1k
views
Interfacing WM8731 code to Arduino Due
WM8731 codec was successfully interfaced with Atmega328 like variants in Arduino. It was first done successfully by Open music labs who are the makers of the breakout board for WM8731. Taking this ...
- 2,522
3
votes
0
answers
331
views
Help to understand multiple PWM working together
I'm very new to arduino related stuff so this question might be really easy to answer.
I don't understand how multiple PWM outputs are supposed to work. Look at the pic.
In the first(1) case we are ...
- 131
3
votes
0
answers
767
views
tone() and PWM limits
I'm developing an active sonar using Costas arrays and Golomb rulers. I need the Arduino to switch between frequencies very quickly to shorten the length of the ping, both to improve processing and to ...
- 38.8k
3
votes
1
answer
785
views
ov2640 with 18 pin and no arducam shield
I bought this ov2640 camera module with 18 pins and I don't have shield to insert it to. I am looking for a library or working code on this my camera sensor but all I kept getting was arducam examples ...
- 31
2
votes
0
answers
331
views
ESP32DevkitC-V4 interfacing ADS8698 (18 bit ADC)
I am currently working on an SPI interface to measure the voltage of an amplified sensor bridge signal. I am using an ESP32 module to control the device. Since I am logging the data to an SD card, I ...
- 21
2
votes
0
answers
130
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On initialising PWM with registers on my Due, why does unrelated duty cycle input influence my output?
I am finding that setting duty cycle on PWM channels 4 or 5 has an influence on whether channel 6 generates output. The following is a design of experiments view of my tests and results, where the ...
- 295