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minor updates for nucleo #5

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Apr 3, 2025
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minor updates for nucleo #5

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31 changes: 16 additions & 15 deletions README.md
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Expand Up @@ -121,8 +121,9 @@ You find a complete example under [exampleESP32DevKitCV4](exampleESP32DevKitCV4/

## Wiring

The STM32 Nucleo 64 board has pre-defined I2C pins. We use I2C1 (SDA on pin 14, SCL on pin 15) and
I2C2 (SDA on pin 3, SCL on pin 6).
The STM32 Nucleo 64 F401RE board has predefined I2C pins.
We connect to the Arduino Pin Header of the board and use the predefined pins for I2C1 and I2C2.
More info about the STM32 Nucleo 64 F401RE Board can be found on st.com.

### Pull Ups

Expand All @@ -138,24 +139,24 @@ this example and the wiring was done using a bread board so that no soldering wa

Names R.1 to R.4 stand for resistors with a value of 8.26kOhm.

| Sensor Board / Resistor | STM32 Nucleo 64 / Resistor | Cable color | Description |
| Sensor Board / Resistor | STM32 Nucleo 64 Arduino Connector / Resistor | Cable color | Description |
|--------------------------------|----------------------------|-------------|-------------|
| SEK-SCD41 A Pin 1 | R.1 | yellow | SCL |
| R.1 | Nucleo Pin 15 | yellow | SCL |
| R.1 | Nucleo 3V3 | | Reference Voltage |
| SEK-SCD41 A Pin 2 | Nucleo GND | black |Ground |
| SEK-SCD41 A Pin 3 | Nucleo 3V3 | red | Sensor Supply Voltage 3-5V |
| R.1 | Pin 15 | yellow | SCL |
| R.1 | 3V3 | | Reference Voltage |
| SEK-SCD41 A Pin 2 | GND | black |Ground |
| SEK-SCD41 A Pin 3 | 3V3 | red | Sensor Supply Voltage 3-5V |
| SEK-SCD41 A Pin 4 | R.2 | green | SDA |
| R.2 | Nucleo Pin 14 | green | SDA |
| R.2 | Nucleo 3V3 | | Reference Voltage |
| R.2 | Pin 14 | green | SDA |
| R.2 | 3V3 | | Reference Voltage |
| SEK-SCD41 B Pin 1 | R.3 | yellow | SCL |
| R.3 | Nucleo Pin 6 | yellow | SCL |
| R.3 | Nucleo 3V3 | | Reference Voltage |
| SEK-SCD41 B Pin 2 | Nucleo GND | black | Ground |
| SEK-SCD41 B Pin 3 | Nucleo 5V | red | Sensor supply voltage 3-5V |
| R.3 | Pin 6 | yellow | SCL |
| R.3 | 3V3 | | Reference Voltage |
| SEK-SCD41 B Pin 2 | GND | black | Ground |
| SEK-SCD41 B Pin 3 | 5V | red | Sensor supply voltage 3-5V |
| SEK-SCD41 B Pin 4 | R.4 | green | SDA |
| R.4 | Nucleo Pin 3 | green | SDA|
| R.4 | Nucleo 3V3 | | Reference Voltage |
| R.4 | Pin 3 | green | SDA|
| R.4 | 3V3 | | Reference Voltage |

What we have to remember for the configuration in the software later is the pins we used for the I2C buses.

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