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--- en:iot-open:practical:hardware:sut:esp32:emb1b_1 [2025/04/25 12:08] – pczekalski
+++ en:iot-open:practical:hardware:sut:esp32:emb1b_1 [2025/04/28 20:32] (current) – [Steps] pczekalski
@@ Line 49: / Line 49: @@
 Declare BME's address, sensor controller class and variables to store readings:
 <code c>
+#define SCL 4
+#define SDA 5
 static const int BME280_addr = 0x76; //I2C address
@@ Line 63: / Line 66: @@
 Initialise the I2C bus and the controller class:
 <code c>
-Wire.begin(5,4); //5 (SDA),  4 (SCL)
+Wire.begin(SDA,SCL);
+delay(100);
 ...
 isBMEOk = bme280.begin(BME280_addr);
@@ Line 69: / Line 73: @@
 If ''begin'' returns ''false'', then initialisation failed. This may be due to an invalid I2C address provided as a parameter of the ''begin'' function, a broken sensor, or broken connections between the MCU and the sensor.
+<note important>You need to initialise the I2C bus only once. If you're using other I2C devices in parallel, do not call ''Wire.begin(...)'' multiple times.</note>
 === Step 4 ===
 Read environmental data (one at a time):

en/iot-open/practical/hardware/sut/esp32/emb1b_1.1745582925.txt.gz · Last modified: 2025/04/25 12:08 by pczekalski