How to send data from Raspberry Pi Pico to arduino nano?

Projects Programming
1

I want to send 2 data using NRF24L01 or Uarts, the data I measured from Raspberry Pi Pico to Arduino Nano. How can I do that?

2

Can anyone help?

3

A bump 16 minutes after posting the question ?

1 Like
4

I'm a little fussy, sorry.

5

A serial link would probably be the easiest

What have you tried ?

6

I find one example from book. But it did not work well for me. I will measurement datas from MPU6050 by using Pico and then i want to send them Arduino Nano.

import machine
import utime
AnalogIn = machine.ADC(4) # ADC channel 4
Conv = 3.3 / 65535 # Conversion factor
 
uart=machine.UART(id=0,baudrate=9600,bits=8,parity=None,stop=1 )
while True: # Do forever
 V = AnalogIn.read_u16() # Read temp
 V = V * Conv # Convert to Volts
 Temp = 27 - (V - 0.706) / 0.001721 # Convert to temp
 Tempstr = str(Temp) # Convert to string
 uart.write(Tempstr[:5]) # Send to UART
 uart.write(" Degrees C\n")
 utime.sleep(10) # Wait 10 seconds



#include <SoftwareSerial.h>
SoftwareSerial MySerial(2, 3); // RX, TX
String Temp;
char ch;
void setup() 
{
 Serial.begin(9600); // Monitor speed 9600
 MySerial.begin(9600); // Soft serial speed 9600
}
void loop() 
{
 if(MySerial.available() > 0) // Data available?
 {
 ch = MySerial.read();
 Temp.concat(ch);
 if(ch == ā€˜\nā€™)
 {
 Serial.print("Temperature = ");
 Serial.print(Temp); // Display data
 Temp="";
 }
 }
}
7

What does that mean ?

What happens when you run the programs ?
Why can't you read the sensor using the Nano alone ?

9

my goal is to write the code using pico. I will either communicate the pico with nrf or do it with this method.

10

Let the data I send be 100. I don't get 100. It comes in order 1-0-0.

[image]

11 
 Tempstr = str(Temp) # Convert to string

You are sending a String of 3 characters so you get three separate characters. Once received by the Nano you can convert the 3 characters to an integer using the toInt() function

See toInt() - Arduino Reference

1 Like
12

i will try and i will text thank you

13

i tried but the value coming to arduino nano is different.

import machine
import utime
 
uart=machine.UART(id=0,baudrate=9600,bits=10,parity=None,stop=1 )
while True: # Do forever
 Temp = 1 # Convert to temp
 Tempstr = str(Temp) # Convert to string
 uart.write(Tempstr[:1]) # Send to UART
 utime.sleep(1) # Wait 10 seconds





String Temp;
void setup() 
{
 Serial.begin(9600); // Monitor speed 9600
}
void loop() 
{
 if(Serial.available() > 0) // Data available?
 {
   Temp.toInt();
 Temp = Serial.read();

 Serial.print("Temperature = ");
 Serial.println(Temp); // Display data
 
 }
}

image

14

A couple of observations

   Temp.toInt();
 Temp = Serial.read();
  • You are converting Temp to an integer before you even read its value
  • the idea is to build the String from its individual characters and only then to convert it to an integer
1 Like
15

Is bits supposed to include start and stop, or is it data.
8-N-1
should probably be
uart=machine.UART(id=0,baudrate=9600,bits=8,parity=None,stop=1

1 Like
16

i tried it but the result same :confused:

17

Post the code that you tried

18 
import machine
import utime
 
uart=machine.UART(id=0,baudrate=9600,bits=8,parity=None,stop=1 )
while True: # Do forever
 
 Temp = 99
 
 Tempstr = str(Temp) # Convert to string
 uart.write(Tempstr[:2]) # Send to UART
 
 utime.sleep(1) # Wait 10 seconds










 	#include <SoftwareSerial.h>
SoftwareSerial MySerial(2, 3); // RX, TX
String ch;
void setup() 
{
 Serial.begin(9600); // Monitor speed 9600
 MySerial.begin(9600); // Soft serial speed 9600
}
void loop() 
{
 if(MySerial.available() > 0) // Data available?
 {
 ch = MySerial.read();
 int mubi = ch.toInt();
 
 Serial.println(mubi); // Display data
 
 }
}
19

Read the whole String into a variable and only once you have done that use the toInt() function to convert it to an int

20

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