Lolin S2 Mini & i2c scanner
Photo
Sketch
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| // Lilon ESP32-S2 connected to i2c scanner | |
| // Copyright (C) 2023 https://www.roboticboat.uk | |
| // dca887ee-1a7a-4a6a-b997-efadef4c3b93 | |
| // | |
| // This program is free software: you can redistribute it and/or modify | |
| // it under the terms of the GNU General Public License as published by | |
| // the Free Software Foundation, either version 3 of the License, or | |
| // (at your option) any later version. | |
| // | |
| // This program is distributed in the hope that it will be useful, | |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| // GNU General Public License for more details. | |
| // | |
| // You should have received a copy of the GNU General Public License | |
| // along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| // These Terms shall be governed and construed in accordance with the laws of | |
| // England and Wales, without regard to its conflict of law provisions | |
| #include "Wire.h" | |
| #define I2C_SDA 3 | |
| #define I2C_SCL 5 | |
| byte response; | |
| byte i2c_address; | |
| void setup() { | |
| // Start the i2c network | |
| Wire.begin(I2C_SDA, I2C_SCL); | |
| // Open the Serial port at 9600 bps | |
| Serial.begin(9600); | |
| // Wait for the Serial port to startup | |
| // Must be connected to laptop/computer | |
| while (!Serial); | |
| // Update the User | |
| Serial.println("Scan for I2C devices"); | |
| } | |
| void loop() | |
| { | |
| // Devices on an I2C network has a 7-bit i2c_address. | |
| // Thus an I2C network can support up to 128 slave devices | |
| // Loop over the I2C devices | |
| for(i2c_address = 1; i2c_address < 127; i2c_address++ ) | |
| { | |
| // The i2c address we are going to check | |
| Wire.beginTransmission(i2c_address); | |
| // Ends a transmission to a slave device that was begun by beginTransmission() | |
| response = Wire.endTransmission(); | |
| // response = 0: success | |
| // response = 1: data too long to fit in transmit buffer | |
| // response = 2: received NACK on transmit of i2c_address | |
| // response = 3: received NACK on transmit of data | |
| // response = 4: other error | |
| if (response == 0) | |
| { | |
| // Have found an I2C device | |
| Serial.print("Device found at 0x"); | |
| // Print a number as an ASCII-encoded hexadecimal | |
| if (i2c_address < 16) {Serial.print("0");} | |
| Serial.println(i2c_address, HEX); | |
| } | |
| } | |
| // wait 1000 milliseconds | |
| delay(1000); | |
| } |