Unanswered Questions
179 questions with no upvoted or accepted answers
4
votes
0
answers
425
views
Rotary Encoder with interrupts - erratic behaviour
I'm trying to change my working rotary encoder code (stolen from here) to an interrupt-based code on my Mega2560. The trouble is that the result behaves very erratically, even though the physical ...
- 41
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
211
views
220v lightbulb gradual dimmer
I am trying to turn my incandescent bulb gradually,say its brightness should go from zero to 100% in 10 mins. In doing so I found the following code and it works well but it's not as gradual as I ...
- 31
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
653
views
Arduino nano clone problem with interrupt on falling edge on pin 2
I've s 1Hz square wave coming from a DS1307 SQW/OUT pin going into pin2 on the Nano that is set up as input with internal pullup enabled.
I've set up the interrupt on falling edge but I can't get the ...
- 2,522
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
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
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
130
views
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
2
votes
0
answers
464
views
External Interrupt and Input Capture pin | Arduino MEGA
I have a code for finding the rpm of one system calling here as engine , the engine have a hall sensor output and I have tried the following Code
#define SERVO_MIN 2000
#define SERVO_MAX 4000
struct ...
- 183