Reference+
Name
read()
Class
I2C
Description
Read bytes from the attached device
You must call beginTransmission() before calling this function. This function
also ends the current transmission and sends any data that was queued using
write() before. It is not necessary to call
endTransmission() after read().
Examples
import processing.io.*; I2C compass; void setup() { //printArray(I2C.list()); compass = new I2C(I2C.list()[0]); } void draw() { // read the heading over I2C from a compass module // with address 33 (hex 0x21) compass.beginTransmission(0x21); // first send a command byte compass.write(0x41); // read in two bytes byte[] in = compass.read(2); // put bytes together to tenth of degrees // & 0xff makes sure the byte is not interpreted as a negative value int deg = (in[0] & 0xff) << 8 | (in[1] & 0xff); println((deg / 10.0)); }
Syntax
.read(len)
Parameters
len
(int)
number of bytes to read
Return
byte[]
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