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Results tagged with arduino-uno
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user 49068
The Arduino Uno is the most common of the Arduino boards. It is based on the ATmega328P microcontroller.
1
vote
Serial communication between nodemcu and Arduino Uno
Arduino UNO is 5v logic and esp8266 is 3.3v logic. You need a level shifter for them to be able to have bidirectional serial link. Alternatively you can just use a voltage divider between Arduino Tx …
- 521
2
votes
Send button only works when pressed immediately after
It looks like the line : while (digitalRead(but) == HIGH) {} will capture the processor in a loop until "but" is pressed. So if you press the send button immediately after using "but" it might see th …
- 521
1
vote
the boxservo works contrary to the code
You have probably installed the box servo backwards so that when it tries to open it actually closes and vice versa.
- 521
-1
votes
esp8266 ip address issues
If you configure the esp as an access point then it should also be the DHCP server and be supplying ip addresses to it's clients. Only if you configure it to be a client station itself (eg. connect t …
- 521
1
vote
Accepted
TX pin sends wrong data in Arduino Uno
Since you have already tried SoftwareSerial, also try inverting the serial protocol via SoftwareSerial. Sometimes a device uses inverted serial protocol and you don't know it.
So initialize inverted …
- 521
0
votes
Accepted
Daisy chaining of multiple blocs of 4x(8x8) MAX7219 matrix
Try using @Majenko 's MAX libary https://github.com/MajicDesigns/MD_MAX72XX . It allows you to specify how many modules are to be addressed.
- 521
1
vote
Ethernet shield connected to local network, not to internet
Find a server that doesn't automatically switch modes to https as google does. If you put 64.233.187.99/search?q=arduino%20HTTP/1.0 in your browser you'll see that it switches to https.
If make …
- 521
1
vote
Using Arduino Wifi Shield to Receive Signal
Look for the Web Server example in the arduino IDE. That will give you a starting point to allow you to control the arduino via a web page. This tutorial is also very in depth : https://startingelec …
- 521
0
votes
Accepted
It gives some glitching on 7 segment display
You are continually incrementing the pin variable via pin++, but you are never resetting it to the start (2?) when a new number is to be written. So it might work the first time but never after that. …
- 521
0
votes
Using Library LoRa.h with Wemos D1 R2 for Lora Shield
When you change boards you must also update your pin connections in software. When you initialize the Lora Shield, you probably specify a few data pins. Those pin numbers cannot be assumed to remain …
- 521
-1
votes
Serial communication from Arduino to ESP8266 NodeMCU works, but from NodeMCU to Arduino isn'...
The problem may stem from Arudino boards being 5v logic pins while ESP boards are 3.3v logic pins. 3.3v high might not be enough for Arduino to see the data.
- 521
0
votes
Accepted
Can I connect this LED Matrix to a ESP8266 Huzzah directly?
The Huzzah is a great board but I don't think it is capable of driving a large led matrix by itself. Adafruit also makes a led matrix feather wing which could enable the huzzah : https://www.adafruit …
- 521