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38 lines
1.0 KiB
38 lines
1.0 KiB
4 years ago
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// Wire Master Reader
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// by devyte
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// based on the example of the same name by Nicholas Zambetti <http://www.zambetti.com>
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// Demonstrates use of the Wire library
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// Reads data from an I2C/TWI slave device
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// Refer to the "Wire Slave Sender" example for use with this
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// This example code is in the public domain.
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#include <Wire.h>
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#include <PolledTimeout.h>
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#define SDA_PIN 4
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#define SCL_PIN 5
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const int16_t I2C_MASTER = 0x42;
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const int16_t I2C_SLAVE = 0x08;
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void setup() {
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Serial.begin(115200); // start serial for output
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Wire.begin(SDA_PIN, SCL_PIN, I2C_MASTER); // join i2c bus (address optional for master)
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}
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void loop() {
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using periodic = esp8266::polledTimeout::periodic;
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static periodic nextPing(1000);
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if (nextPing) {
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Wire.requestFrom(I2C_SLAVE, 6); // request 6 bytes from slave device #8
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while (Wire.available()) { // slave may send less than requested
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char c = Wire.read(); // receive a byte as character
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Serial.print(c); // print the character
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}
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}
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}
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