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how can I make SDA and SCL I2C connection
2y
To establish I2C communication, you need to make the following connections:
- Connect the SDA pin of your I2C master device (for instance, a microcontroller) to the SDA pin of your I2C slave device (like a sensor). In your case, refer to your board's documentation to find out which pin, typically marked SDA, should be used for SDA signal of I2C.
- Similarly, connect the SCL pin of your I2C master to the SCL pin of your I2C slave. Find out the corresponding pin for SCL signal of I2C according to your board's documentation.
- Connect the ground pin of your I2C master to the ground pin of your I2C slave to ensure both devices share a common ground.
It's important to note that:
- I2C is a bus system that requires pull-up resistors on the SDA and SCL lines. If not already internally pulled up, make sure to include these in your circuit.
- The board used might have specific pins already dedicated for I2C communication. Please check your board's datasheet to confirm this.
Given your project description where SDA and SCL are mentioned as Designator, assuming SDA is connected to J4:Pin_2, and SCL is connected to J4:Pin_3, for a standard I2C connection:
- The SDA line on your board (J4:Pin_2) would connect to the SDA line on the device you are trying to communicate with,
- The SCL line on your board (J4:Pin_3) would connect to the SCL line on the device.
- If there are multiple devices, remember that I2C is a bus, so all SDA lines can be connected together, and all SCL lines can be connected together.
Note that this answer is under the assumption that the device you're newly trying to connect supports I2C. Always remember to check the datasheet for your specific devices because the connections may vary.
2y
What is the better IO pin to connect I2C connection
2y
Choosing the appropriate I/O pin for your I2C connection can be quite specific to the microcontroller you're using. Each microcontroller has a specific set of pins that support I2C communication by having built-in pull-up resistors and the ability to switch between input and output dynamically, which is required for the open-drain configuration used in I2C.
In your project, the ESP32-C3-WROOM-02-N4 microcontroller from Espressif Systems is used as the microcontroller (or U1 in the diagram). According to its datasheet, the ESP32-C3 series have dedicated pins for I2C communication. Specifically, you can leverage any GPIO for I2C, but generally, the default I²C pins on ESP32 are:
- SDA: GPIO21
- SCL: GPIO22
However, it appears these I/Os are not available in your project schematic. In that case, you can choose to configure any available general-purpose I/O (labelled as IO[number], e.g., IO4, IO5, IO6...) in software to act as SDA and SCL pins.
Please ensure you configure your software to use the right pins for I2C and remember to connect pull-up resistors (usually in the range of 4.7k ohms to 10k ohms) on the SDA and SCL lines as I2C relies on an open-drain or open-collector configuration.
Always check the specification in the datasheet since pin assignments can change based on the specific part number of the ESP32 module.
2y
3
CHECK RESISTOR VALUES!
CHECK RESISTOR VALUES!
2y
6
how do I connect J2 and IC2?
2y
To connect the J2 and IC2, you will need to determine the functional relationship between them. The information you've currently provided doesn't describe a specific role for IC2 or J2, so I'll make some typical assumptions.
Assumption:
- J2, as a connector, might be a power source or acting as an output to supply power.
- IC2, an Integrated Circuit, could be a simple power management IC or another important functional IC which requires power.
Here's a simple connection method:
-
Connect the power supply pin of IC2 (normally named as VCC, VIN, or VDD) to the POS (assuming as positive supply) of J2.
-
Furthermore, it's crucial to connect all your GNDs together, connect the ground pin of IC2 (normally named as GND) to the NEG of J2.
Please note that this is an oversimplified connection, and the actual method could vary depending on the exact function and requirements of your IC2 and J2. For example, some ICs could require additional components (like decoupling capacitors) between power pins and GND.
Let me know the specific usage or even part numbers of IC2 and J2 for more detailed help.
2y
2
how do I connect U1 and J4?
2y
To connect U1 (ESP32-C3-WROOM-02-N4) and J4, we need to know the exact purpose of the connection. But, assuming you have mentioned J4 which has four pins labeled Pin_1, Pin_2, Pin_3, Pin_4, and you want to have a standard I2C communication between both, consider the following.
This could be achieved by connecting:
- The SDA net to U1:IO18 and J4:Pin_2
- The SCL net to U1:IO19 and J4:Pin_3
- GND between U1 and J4
- 3.3V to U1:3V3 and J4:Pin_1
Please remember to note down the connection details and power requirements of the specific device you're connecting to the ESP32 module.
These are common connections for I2C communication, and the connection type may vary if you want a different communication protocol (like UART or SPI) or some other interconnection.
2y
4
U0RXD
3V3_EN
ESP_BOOT
C5
Capacitance
100p F
U0TXD
L1
Inductance
2.2u H
C1
Capacitance
3.3n F
+5V
SDA
C3
Capacitance
22u F
R8
Resistance
10k Ω
D1
Capacitance
12p F
U0RXD
IC1
+5V
USB_D-
+5V
3V3_USB
SGP41_EN
GND
USB_D-
3V3_USB
USB_D+
C4
Capacitance
1u F
IO7
C6
Capacitance
0.1u F
IO10
C2
Capacitance
10u F
C8
Capacitance
100p F
IO10
SCL
USB_D+
U0TXD
USB_D+
SHT40_EN
ESP_EN
R14
Resistance
200 Ω
R3
Resistance
10k Ω
+5V
3V3_USB
1V8_EN
3V3_USB
SCD41_EN
SDA
+5V
USB_D-
SCL
ESP_BOOT
J1 GND - IC3 GND
3V3_USB
ESP_EN
IO8
R2
Resistance
Resistance
SW1
C10
Capacitance
0.1u F
SW2
R9
Resistance
10K Ω
IC3
C11
Capacitance
10u F
R5
Resistance
100K Ω
C7
Capacitance
10u F
LED3
R12
Resistance
5.1k Ω
C9
Capacitance
10u F
J2
R10
Resistance
10K Ω
U1
R4
Resistance
Resistance
R11
Resistance
5.1k Ω
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Overlapping Copper • 14
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Airwires • 67
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- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
- Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #powerjharwinbarrozo11.4M
- A generic fixed resistor for rapid developing circuit topology. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0Ω 10Ω 100Ω 1.0kΩ 10kΩ 100kΩ 1.0MΩ 1.1Ω 11Ω 110Ω 1.1kΩ 11kΩ 110kΩ 1.1MΩ 1.2Ω 12Ω 120Ω 1.2kΩ 12kΩ 120kΩ 1.2MΩ 1.3Ω 13Ω 130Ω 1.3kΩ 13kΩ 130kΩ 1.3MΩ 1.5Ω 15Ω 150Ω 1.5kΩ 15kΩ 150kΩ 1.5MΩ 1.6Ω 16Ω 160Ω 1.6kΩ 16kΩ 160kΩ 1.6MΩ 1.8Ω 18Ω 180Ω 1.8KΩ 18kΩ 180kΩ 1.8MΩ 2.0Ω 20Ω 200Ω 2.0kΩ 20kΩ 200kΩ 2.0MΩ 2.2Ω 22Ω 220Ω 2.2kΩ 22kΩ 220kΩ 2.2MΩ 2.4Ω 24Ω 240Ω 2.4kΩ 24kΩ 240kΩ 2.4MΩ 2.7Ω 27Ω 270Ω 2.7kΩ 27kΩ 270kΩ 2.7MΩ 3.0Ω 30Ω 300Ω 3.0KΩ 30KΩ 300KΩ 3.0MΩ 3.3Ω 33Ω 330Ω 3.3kΩ 33kΩ 330kΩ 3.3MΩ 3.6Ω 36Ω 360Ω 3.6kΩ 36kΩ 360kΩ 3.6MΩ 3.9Ω 39Ω 390Ω 3.9kΩ 39kΩ 390kΩ 3.9MΩ 4.3Ω 43Ω 430Ω 4.3kΩ 43KΩ 430KΩ 4.3MΩ 4.7Ω 47Ω 470Ω 4.7kΩ 47kΩ 470kΩ 4.7MΩ 5.1Ω 51Ω 510Ω 5.1kΩ 51kΩ 510kΩ 5.1MΩ 5.6Ω 56Ω 560Ω 5.6kΩ 56kΩ 560kΩ 5.6MΩ 6.2Ω 62Ω 620Ω 6.2kΩ 62KΩ 620KΩ 6.2MΩ 6.8Ω 68Ω 680Ω 6.8kΩ 68kΩ 680kΩ 6.8MΩ 7.5Ω 75Ω 750Ω 7.5kΩ 75kΩ 750kΩ 7.5MΩ 8.2Ω 82Ω 820Ω 8.2kΩ 82kΩ 820kΩ 8.2MΩ 9.1Ω 91Ω 910Ω 9.1kΩ 91kΩ 910kΩ 9.1MΩ #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed inductor for rapid developing circuit topology. *You can now change the footprint and 3D model at the top level anytime you want. This is the power of #genericsjharwinbarrozo15.1k
- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlinkjharwinbarrozo1.2M
- 10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcanjharwinbarrozo1.2M
- Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlinkjharwinbarrozo1.1M
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esp-32-module
Controls
Properties
Availability & Pricing
| Distributor | Qty 1 | |
|---|---|---|
| Digi-Key | $8.52–$10.23 | |
| LCSC | $5.23 | |
| Mouser | $8.69 | |
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