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Results tagged with arduino-nano
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user 359
The Arduino Nano is a small board based on the ATmega328 or 168. It has male headers, so it can be plugged directly into a breadboard. It is small and compact, and features a USB chip.
2
votes
Arduino self programming
You can write to the non-volatile memory of the microcontroller and then read it again during setup.
Another (perhaps simpler) option is to have an external eeprom chip in a socket to hold the setti …
- 3,267
4
votes
How to use digital pin as ground?
There is no need to separate grounds, you can connect all grounds together. In fact they are connected together on the board itself.
- 3,267
3
votes
how fast does loop() run in Arduino
the instructions between the end of loop() and the next run of it are a ret, jmp and a call.
You can consider the main function to be effectively:
void main(){
init();
while(1) loop();
}
…
- 3,267
0
votes
Breaking up for loop with ISR
Turn the loop into a state machine instead.
Wrap the entire loop body in a switch.
Every time you have a delay(t); make it a target for a case label and replace it with
startTimeout = millis();
c …
- 3,267
1
vote
Accepted
How to dynamically allocate arrays
serial.println doesn't work that way. Or more precisely + with string literal and an int does not create a concatenated string. Instead it treats the string literal as a char* and then does pointer ar …
- 3,267
3
votes
Calling I2C functions inside an ISR
The better way to do it would be to set a volatile flag in the ISR and handle that in the main loop.
This relies on you making sure the main loop never blocks so the flag can be check often.
volatil …
- 3,267
0
votes
Accepted
Arduino Nano + RC522 + w5500 Ethernet Module
If both modules use SPI then they should each have a separate pin connected to the slave select.
This lets you select which module you are talking to every time you start a communication. If the modu …
- 3,267
0
votes
Accepted
Rfid reader and SD card shield won't work together
SD cards (or really their breakout boards) don't tend to obey the rules with regards to SPI. In particular the MISO pin isn't set to high impedance when the slave select is not selected.
You can fix …
- 3,267
3
votes
Interrupts Problem with Flow sensor
A lot of peripheral libraries requires interrupts to be enabled, especially when they use timing or the I2C/SPI pins. Instead of disabling interrupts for the majority of the sketch, what you want to d …
- 3,267
2
votes
Connecting two Arduinos via I2C while I2C Pins A4/A5 are already in use
You can make the nanos use software I2C to isolate those I2C buses from the UNO's I2C bus. Then have the UNO be the master on it's own bus, requesting the data when needed.
Though if you go for softw …
- 3,267