Adrunio as I2c slave
- Thread starter wagp
- Start date
#include <Wire.h>
In your Arduino:
#define SLAVE_ADDRESS 0x29 // e.g. slave address,any number from 0x01 to 0x7F
void setup()
{
Wire.begin(SLAVE_ADDRESS);
}
{
// Then in main body send your data to your PICAXE master
}
OR
#include <Wire.h>
void setup()
{
Wire.begin(2); // join i2c bus with address #2
Wire.onRequest(requestEvent); // register event
}
void loop()
{
delay(100);
}
// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent()
{
Wire.write("hello "); // respond with message of 6 bytes
// as expected by master
}
In your Arduino:
#define SLAVE_ADDRESS 0x29 // e.g. slave address,any number from 0x01 to 0x7F
void setup()
{
Wire.begin(SLAVE_ADDRESS);
}
{
// Then in main body send your data to your PICAXE master
}
OR
#include <Wire.h>
void setup()
{
Wire.begin(2); // join i2c bus with address #2
Wire.onRequest(requestEvent); // register event
}
void loop()
{
delay(100);
}
// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent()
{
Wire.write("hello "); // respond with message of 6 bytes
// as expected by master
}
westaust55
Moderator
It is noted that the OP is using a 40X2, however, for consistency across the PICAXE range and taking into account the i2c address limitations applicable to at least the PICAXE 20X2 parts, it would be preferable to avoid i2c slave addresses $00, $01 and $02. Otherwise if someone clones the code for a 20X2 at a future date there is the likelihood of a post saying “it doesn't work for my 20X2”.
See section 4.4 in the PIC18(L)F1XK22 Family
Silicon Errata and Data Sheet Clarification here:
http://ww1.microchip.com/downloads/en/DeviceDoc/80437F.pdf
Specifically:
Last edited: