Problems i2c to Arduino
Posted: Tue May 05, 2015 5:32 amHello,
I'm wiring an attiny 85 to an esp8266 via I2C. I'm just trying to send 1 byte from the slave attiny back to the esp.
Here are the codes
(attiny)
ESP8266
I can see the led on the attiny blink (meaning that the I2C bus is called correctly), but the value read by the esp is always 0 instead of 10. What is the problem?
I'm wiring an attiny 85 to an esp8266 via I2C. I'm just trying to send 1 byte from the slave attiny back to the esp.
Here are the codes
(attiny)
Code: Select all
#include "TinyWireS.h"
#define I2C_SLAVE_ADDR 0x26
#define LED_PIN 1
byte t=10;
void setup(){
pinMode(LED_PIN,OUTPUT);
TinyWireS.begin(I2C_SLAVE_ADDR);
digitalWrite(LED_PIN,LOW);
TinyWireS.onRequest(requestEvent);
}
void loop()
{
}
void requestEvent(){
TinyWireS.send(t);
Blink(LED_PIN);
}
void Blink(byte led) {
digitalWrite(led,HIGH);
delay(200);
digitalWrite(led,LOW);
}ESP8266
Code: Select all
id = 0
i2c.setup(id,7,6,i2c.SLOW)
i2c.start(id)
i2c.address(id, 0x26,i2c.RECEIVER)
result=i2c.read(id,1)
i2c.stop(id)
print("value is " .. string.byte(result,1) ) I can see the led on the attiny blink (meaning that the I2C bus is called correctly), but the value read by the esp is always 0 instead of 10. What is the problem?