Unanswered Questions
289 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
76
views
Can I use regular pins (Example: D2, A3, etc...) as serial (RX, TX)?
Python/Arduino Beginner here...
I have a DFplayer I am trying to hook to my Arduino and I want to hook it up through the regular pins instead of the RX and TX pins, but I've not been able to find ...
- 41
4
votes
2
answers
732
views
Bluetooth communication not working with DC power but works with USB power?
I am running an HM-10 Bluetooth Low Energy (BLE) module to transmit serial data (using SoftwareSerial) from an analog sensor onboard my Arduino Uno to a serial terminal app on my Android phone. When I ...
CommunityBot
- 1
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
608
views
PCA9685 - Hardware problem with diode?
I'm working on a project, where I need to run several high-torque servos. For that I bought come of these PCA9685 boards.
I hooked everything up with my arduino and connected an external 5V - max 3A ...
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
0
answers
1k
views
TRIAC Pulse driver for Spot Welder (help needed with programming)
I have designed and built a transformer driver board for my spot welder. It is powered from mains electricity (230 V) and consists of the following segments: triac drive and protection, zero cross ...
- 31
3
votes
0
answers
93
views
Correctly Powering Lilypad Arduino
I am trying to correctly power a Lilypad Arduino that is attached with an HC-05, Lilypad temp sensor, and Amped pulse sensor. So far I have found that powering by plugging the Lilypad into my laptop ...
- 31
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
214
views
Atmel SAM MCU (on Arduino Due) only boots after second power up
I am using an Arduino Due as a prototyping board for a microcontroller project. The due has the chip Atmel ATSAM3X8E, with an ARM Cortex-M3 core. I am programming the flash directly using Atmel Studio ...
GrixM
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