Wemos D1 mini - I2C not working.
Posted: Sat Jun 16, 2018 5:10 amHi,
I2C don't seems to work on Wemos D1 mini and BMP180 shield, running an i2c scanner sketch works if you search a range of address but it if you only search for 1(or 2) address it returns a NACK.
BMP180 is on 0x77. error code return was 2.
Been trying various different ways to get it to work without success. any help is appreciated.
Terence.
Sketch for testing.
I2C don't seems to work on Wemos D1 mini and BMP180 shield, running an i2c scanner sketch works if you search a range of address but it if you only search for 1(or 2) address it returns a NACK.
BMP180 is on 0x77. error code return was 2.
Been trying various different ways to get it to work without success. any help is appreciated.
Terence.
Sketch for testing.
Code: Select all
#include <Wire.h>
void setup()
{
//D1 - SCL
//D2 - SDA
Wire.begin();
Serial.begin(9600);
while (!Serial); // Leonardo: wait for serial monitor
Serial.print("\nI2C Scanner : ");
}
//0:success
//1 : data too long to fit in transmit buffer
//2 : received NACK on transmit of address
//3 : received NACK on transmit of data
//4 : other error
void loop()
{
byte error, address;
int nDevices;
Serial.println("Scanning...");
nDevices = 0;
for (address = 0x75; address < 0x78; address++)
{
Wire.beginTransmission(address);
error = Wire.endTransmission();
Serial.print("error = ");
Serial.println(error);
Wire.flush();
if (error == 0)
{
Serial.print("I2C device found at address 0x");
if (address<16)
Serial.print("0");
Serial.print(address, HEX);
Serial.println(" !");
nDevices++;
}
else if (error == 4)
{
Serial.print("Unknown error at address 0x");
if (address<16)
Serial.print("0");
Serial.println(address, HEX);
}
}
if (nDevices == 0)
Serial.println("No I2C devices found\n");
else
Serial.println("done\n");
delay(5000); // wait 5 seconds for next scan
}