Unanswered Questions
217 questions with no upvoted or accepted answers
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
206
views
How to filter out "jumpy" readings sent using Bluetooth
I'm using App Inventor to continuously send orientation values (as strings) to my Arduino, which are read using Serial.parseInt(). Using simple IF statements (if value > threshold), I'm trying to turn ...
- 2,422
3
votes
0
answers
74
views
Why RTU bridge timeout even though answer is received?
I'm testing the following code as a bridge between https://sourceforge.net/projects/qmodmaster/ and https://pypi.org/project/pyModSlave/.
As hardware, I'm using a NodeMCU 1.0 and a USB/TTL converter.
...
- 31
3
votes
0
answers
191
views
Grove LCD display not working with arduino rev 2 wifi (Unknown error at address 0x3E)
I am trying to connect Grove 16x2 LCD (White on Blue) to my Arduino uno rev 2 wifi.
So far, I've tried hd44780 library's ioClass examples, but nothing worked. I've then decided to scan ports and when ...
- 31
3
votes
0
answers
156
views
How do I Continuity Test/Troubleshoot a Linksprite RS232 V2 Shield?
I have a Linksprite RS232 v2 adapter (which uses a MAX232 chip), as per this image. I have soldered on the headers and tested the pins to make sure there are no solder bridges. I have set the jumpers ...
- 139
3
votes
0
answers
692
views
ATtiny85 + HC-05 + Oled = smart watch
I am using an ATtiny85 for making a smart watch. Bluetooth module HC-05 with ATtiny85 pins PB3->TX, PB4->RX and it works. Secondly I have connected a 0.96" OLED on PB0 (SDA) and PB2 (SCL) and this is ...
- 1,595
3
votes
0
answers
700
views
Serial does not work when LiquidCrystal library is used
I have been struggling with a LCD for 6 hours straight - I've had many problems including random characters showing up, and this time (not quite sure what changed, I tried so many things) as soon as I ...
- 2,522
3
votes
1
answer
1k
views
3.5 inch TFT LCD connection diagram with mega r3
Forum post
I would like to ask if someone has this shield fully working?
My biggest problem is the touch screen that I couldn't manage to make work.
Here is the code I am using:
// ic: ili9327
#...
CommunityBot
- 1
3
votes
0
answers
1k
views
Sending binary data to Matlab via serial
I would like to exchange data via Xbee. I've set up a communication based on strings between the Arduino and a Matlab software.
Unfortunately this kind of communication isn't enough robust and ...
- 2,522
3
votes
0
answers
883
views
Hiduino as a Serial-USB midi coverter
I have an Arduino Mega2560 configured to Hiduino, which makes the Arduino a driverless class-compliant MIDI interface.
I am currently converting RS232 serial I/O data to midi data using the 'hairless ...
- 61
2
votes
0
answers
85
views
Arduino code intermittent
Have an alarm for "tea time", "lunch time" and "tea time". Works well at times but occasionally it gets stuck on the alarm not resetting, other times it does not trigger ...
- 544
2
votes
0
answers
163
views
Arduino Uno not interfacing with GSM SIM900A Module
I am using an Arduino Uno with a SIM900A module. I want to send a simple SMS but it is not working, as it either has no response in Serial monitor or there are reversed question marks. I have attached ...
- 1
2
votes
0
answers
99
views
How to show repeated result on LCD while button is pressing
my results are here.
0 press--"a"
1st press--"b"
2nd press--"c"
3rd press-- still showing "c"
When button pressed 3rd time, It must be repeated to show "a&...
- 5,514
2
votes
0
answers
161
views
TFT Screen with Arduino UNO does not display as expected
I have a 3.5" TFT LCD communicating in parallel connected to Arduino UNO.
I expect it draws a white circle on a black background but all it does is to show a white screen.
How to fix this?
main.c
...
- 173
2
votes
0
answers
949
views
How to know if GPS module is dead?
I can't make function the NEO-6M-0-001 GPS module, this is the third one that already bought! I'm using an ATmega2560 as microcontroller for obtaining the data from the module and seems that the ...
