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en:iot-open:practical:hardware:sut:esp32:emb2_1 [2024/04/20 08:19] pczekalskien:iot-open:practical:hardware:sut:esp32:emb2_1 [2025/04/28 20:31] (current) – [Steps] pczekalski
Line 75: Line 75:
 <note tip>Note: Step 5 presents some stub code for displaying data on an OLED display.</note> <note tip>Note: Step 5 presents some stub code for displaying data on an OLED display.</note>
 === Step 1 === === Step 1 ===
-Define I2C bus GPIOs: clock (SCL) uses GPIO 4 and data (SDA) GPIO 5. ADC uses GPIO 7. Digital potentiometer chip DS1803 uses 0x28 I2C address. All definitions are present in the following code:+Define I2C bus GPIOs: clock (SCL) uses GPIO 4and data (SDA) uses GPIO 5. ADC uses GPIO 7. Digital potentiometer chip DS1803 uses 0x28 I2C address. All definitions are present in the following code:
 <code c> <code c>
 #define SCL 4 #define SCL 4
Line 94: Line 94:
   Wire.begin(SDA,SCL);   Wire.begin(SDA,SCL);
   delay(100);   delay(100);
 +  ...
 +  
   pinMode(POT_ADC, INPUT);   pinMode(POT_ADC, INPUT);
 </code> </code>
 +
 +<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 === === Step 4 ===
-Read the loopback characteristics of the digital potentiometer to ADC loop and store it in the array:+Read the loopback characteristics of the digital potentiometer to the ADC loop and store it in the array:
 <code c> <code c>
 for(byte i=0; i<128; i++) for(byte i=0; i<128; i++)
en/iot-open/practical/hardware/sut/esp32/emb2_1.1713601192.txt.gz · Last modified: 2024/04/20 08:19 by pczekalski
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