Power net portal is a special schematic object used to define a power or ground net. Power ports allow you to conveniently indicate a power net at any location in the design. Power nets of the same designator automatically connect throughout your design #portal #power
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 #generics
Switching to an Adafruit ESP32 development board for your project involves considering the pinout differences between the Adafruit board and the ESP32-WROOM-32 module you initially planned to use. Adafruit ESP32 boards typically come with a user-friendly pinout that might slightly differ from the Espressif's ESP32-DEVKITC you were using. While I don't have the exact pinout of the specific Adafruit board you're planning to use, most Adafruit ESP32 development boards follow a standardized pinout for core functionalities.
Assuming you're using a common Adafruit ESP32 board such as the HUZZAH32, the main connections for power, sensors (BME688), the CD74HC4066 analog multiplexer, and the RAK811 LoRa module would remain conceptually similar but will need to be mapped to the corresponding pins on the Adafruit board.
Here's a generalized connection guideline based on typical Adafruit ESP32 board pin functionalities. Please adjust these connections based on the exact pinout of your Adafruit board:
Power Connections:
Connect the Adafruit ESP32 3V3 (3.3V output) to the power supply pins of the BME688 sensors, CD74HC4066, and RAK811 LoRa module. This provides the necessary power to each of these components.
Connect the Adafruit ESP32 GND to the ground pins of the BME688 sensors, CD74HC4066, and RAK811 LoRa module to complete the power circuit.
Sensor (BME688) Connections to CD74HC4066:
Assume to digitalize the analog sensor data, you'll use multiple GPIOs for selecting the active channel on the CD74HC4066 and one GPIO (or analog input capable GPIO) to read the sensors' data through the multiplexer. You can use GPIOs (e.g., IO13, IO12, IO14, IO27) for channel selection signals to the CD74HC4066 and IO34 (analog input capable) for reading the sensor data.
RAK811 LoRa Module Connection:
Connect the Adafruit ESP32 TX pin to the RAK811 RX pin and the Adafruit ESP32 RX pin to the RAK811 TX pin for UART communication.
Summarized Connections:
Power Supply:
Connect Adafruit ESP32: 3V3 to BME688 sensors, CD74HC4066, and RAK811 VCC.
Connect Adafruit ESP32: GND to BME688 sensors, CD74HC4066, and RAK811 GND.
BME688 Sensors to CD74HC4066:
Assuming usage of IO13, IO12, IO14, IO27 for CD74HC4066 channel selection.
Use IO34 for analog data input from the CD74HC4066.
RAK811 LoRa Module to Adafruit ESP32:
Connect Adafruit ESP32: TX to RAK811: RX.
Connect Adafruit ESP32: RX to RAK811: TX.
Final Notes:
Remember, this is a generalized guideline. The exact pin naming and availability might differ on your specific Adafruit ESP32 board, and you will need to consult the Adafruit board’s datasheet or pinout diagram to map these connections accurately. Additionally, ensure that the logic levels and power requirements are compatible across your components to prevent any damage.
hey @copilot I wanr to connent Adafruit esp32 devlopment board microcontroller with 4 BME688 sensors using CD74HC4066: Type: 4-Channel Analog Multiplexer and RAK811 LORA module
For connecting an Adafruit ESP32 development board with 4 BME688 sensors using a CD74HC4066 4-channel analog multiplexer and a RAK811 LoRa module, you'll follow a systematic approach that involves setting up the multiplexer to read from the four BME688 sensors sequentially and configuring the LoRa module for communication. Here's how you can proceed with these connections:
1. Power Connections:
Adafruit ESP32 to Sensors and Modules: Connect the $3V3$ and $GND$ pins of the Adafruit ESP32 to the VCC and GND pins of the CD74HC4066, RAK811, and all BME688 sensors accordingly.
2. BME688 Sensors to CD74HC4066:
Since the BME688 sensors can output data via I2C and the CD74HC4066 is an analog multiplexer, you typically wouldn't use a multiplexer for digital I2C signals without a specific design reason. However, assuming the BME688 sensors are being used in a scenario where analog data is read (assuming a special use case like reading raw analog signals from the sensor for a specific purpose), you can connect each sensor's analog output to one of the CD74HC4066's input channels. If you're referring to I2C communication with BME688 sensors, please note that a multiplexer suitable for I2C should be used instead (like TCA9548A). Assuming an analog use case for instructional purposes:
Sensor 1 Output to CD74HC4066: Channel 1 input
Sensor 2 Output to CD74HC4066: Channel 2 input
Sensor 3 Output to CD74HC4066: Channel 3 input
Sensor 4 Output to CD74HC4066: Channel 4 input
3. CD74HC4066 to Adafruit ESP32:
Control the CD74HC4066 channel selection via GPIOs from the ESP32 and read the sensor data from the multiplexer's common output:
Multiplexer Control (Select lines): Connect ESP32 GPIOs (e.g., IO12, IO13, IO14, IO27) to the CD74HC4066's select inputs (S0-S3) to control which channel is active.
Multiplexer Output: Connect the multiplexer's single output to an ADC capable GPIO on the ESP32 (e.g., IO34) to read the analog sensor data.
4. RAK811 LoRa Module Connection:
To communicate with the RAK811 LoRa module via UART, connect it like this:
Adafruit ESP32 TX (e.g., IO17) to RAK811 RX
Adafruit ESP32 RX (e.g., IO16) to RAK811 TX
Summarized Connections:
Power Connections:
Adafruit ESP32: $3V3$ to each BME688 VCC, CD74HC4066 VCC, RAK811 VCC
Adafruit ESP32: $GND$ to each BME688 GND, CD74HC4066 GND, RAK811 GND
BME688 Sensors to CD74HC4066:
Connect each sensor's analog output to respective CD74HC4066 inputs $(not typically applicable for I2C data from BME688)$
CD74HC4066 to Adafruit ESP32:
Connect $CD74HC4066:S0-S3$ to $ESP32:GPIOs$ (e.g., IO12, IO13, IO14, IO27)
Connect $CD74HC4066: Common Output$ to $ESP32:ADC Input$ (e.g., IO34)
RAK811 LoRa Module to Adafruit ESP32:
Connect $Adafruit ESP32:TX$ (e.g., IO17) to $RAK811:RX$
Connect $Adafruit ESP32:RX$ (e.g., IO16) to $RAK811:TX$
Additional Considerations:
Ensure that your Adafruit ESP32 development board GPIOs are correctly configured for their roles (ADC inputs, UART communication, digital outputs for multiplexer control).
For I2C sensors like BME688, consider using a digital I2C multiplexer if you need to handle multiple sensors over I2C with limited pins.
Always double-check the datasheet for each component for any specific electrical requirements or limitations.
This guide assumes you are using an analog output from the BME688 sensors for illustrative purposes. If your application involves standard I2C communication with the BME688 sensors, consider using an I2C multiplexer instead of an analog multiplexer like the CD74HC4066.
9mo
hey @copilot I wanr to connent ESP32-WROOM-32 microcontroller with 10 BME688 se...
hey @copilot I wanr to connent ESP32-WROOM-32 microcontroller with 10 BME688 sensors using CD74HC4066:
Type: 4-Channel Analog Multiplexer and RAK811 LORA module
To connect an ESP32-WROOM-32 microcontroller with 10 BME688 sensors using a CD74HC4066 (a 4-channel analog multiplexer/demultiplexer) and integrate a RAK811 LoRa module for communication, follow these steps. Given the nature of your components and the task you want to accomplish, we will need to use multiple CD74HC4066 chips due to the 4-channel limit per chip to handle the 10 BME688 sensors. This setup assumes the BME688 sensors communicate via I2C, which is a common interface for such sensors. If they use a different interface, please adjust accordingly.
Assumptions
The BME688 sensors use the I2C interface.
A single ESP32-WROOM-32's I2C bus will be shared among the sensors, utilizing the CD74HC4066 chips to selectively connect each sensor.
Since the ESP32 has limited I2C buses, and assuming we want to multiplex the I2C signal to communicate with numerous sensors, we can use the analog switch capabilities of the CD74HC4066 for this purpose.
The CD74HC4066's channels will be used to switch the SDA (Data Line) of the I2C bus, while the SCL (Clock Line) can be commonly connected to all sensors since it is only used to synchronize data transfer and doesn't interfere with multiplexing.
The RAK811 module will be connected to the ESP32 via a UART (Serial) interface for LoRa communication.
ConnectionsESP32-WROOM-32 to CD74HC4066 (Multiplexing Setup)
To connect 10 BME688 sensors, you will need 3 CD74HC4066 chips (since each provides 4 channels, and 3 chips provide access to 12 channels, enough for 10 sensors).
I2C Bus Setup for BME688 Sensors:
Connect ESP32-WROOM-32:GPIO21 (SDA) to CD74HC4066 Chip 1:IN/OUT1, Chip 2:IN/OUT1, and Chip 3:IN/OUT1. These are your SDA lines for each group of sensors.
Connect ESP32-WROOM-32:GPIO22 (SCL) directly to all BME688 sensors: SCL pins. Since SCL lines can be common for all devices on the I2C bus.
Control Lines for CD74HC4066 (selecting which sensor to communicate with):
You'll need to use GPIO pins from the ESP32 to control the switches. Let's assume GPIOs 25, 26, 27, 32 are used for the first CD74HC4066, GPIOs 33, 14, 12, 13 for the second one, and two more GPIOs (say 4 and 5) for the third chip's first two channels, adequately.
For each CD74HC4066, connect a GPIO from ESP32 to each of the CD74HC4066's control pins (A, B, C, and D) to select the sensor to communicate with.
Interconnecting CD74HC4066 and BME688 Sensors:
For simplicity, let's focus on connecting one sensor to understand the repeating pattern.
Connect CD74HC4066 Chip 1:OUT/IN1 to BME688 Sensor 1:SDA.
Repeat similar connections for subsequent BME688 sensors, using OUT/IN2, OUT/IN3, etc., and distributing them across the CD74HC4066 chips as per the available channels.
ESP32-WROOM-32 to RAK811 LoRa Module:
Connect ESP32-WROOM-32:GPIO17 (U2_TXD) to RAK811:RX.
Connect ESP32-WROOM-32:GPIO16 (U2_RXD) to RAK811:TX.
Ensure that the ESP32 and RAK811 are powered adequately and that any necessary ground connections are made.
Remarks
Remember to configure the ESP32's GPIOs used for CD74HC4066 control as output pins in your code.
You will need to write software that sequentially selects each sensor via the CD74HC4066, reads data from it, and then deselects it before moving to the next sensor.
The connection recommendations made above are schematic. Ensure to follow proper PCB design practices when laying out these connections, considering trace lengths, interference, and other factors that may affect the I2C signal quality and overall device performance.
I'm sorry for any confusion, but as a text-based AI developed by Flux.ai, I cannot create or display images, including schematic diagrams or PCB layouts directly within this conversation. However, I can guide you through the process of creating the schematic using the Flux.ai electronics CAD program, or any other tool you prefer, based on the connections I've outlined.
To visualize the schematic based on the previous description, you'd typically follow these steps in your CAD software:
Place Components:
Start by placing one ESP32-WROOM-32 microcontroller, three CD74HC4066 chips, ten BME688 sensors, and one RAK811 module onto your schematic workspace.
Connect I2C Bus for BME688 Sensors:
Draw lines (nets) from the ESP32's GPIO21 (SDA) to the input/output pins (select one as the input for simplicity, following your CAD tool's convention) of the first channel on each CD74HC4066. This will represent your shared SDA line through the multiplexers.
Connect the ESP32's GPIO22 (SCL) directly to the SCL pin of all BME688 sensors, indicating a direct connection for the I2C clock line, which is shared across all sensors.
Draw Control Lines for CD74HC4066:
For selecting the active channel on each CD74HC4066, draw nets from ESP32 GPIOs (assuming 25, 26, 27, 32 for the first CD74HC4066; 33, 14, 12, 13 for the second; and 4, 5 for the first two channels of the third) to the control pins (A, B, C, D) of each CD74HC4066 chip.
Connect CD74HC4066 to BME688 Sensors:
From each CD74HC4066 output/channel, draw a net to the SDA pin of a BME688 sensor. Organize them so that each sensor is connected to a unique channel across the three CD74HC4066 chips.
Connect ESP32 to RAK811 LoRa Module:
Draw a net from ESP32 GPIO17 (U2_TXD) to the RAK811 RX pin, and another from ESP32 GPIO16 (U2_RXD) to the RAK811 TX pin, for UART communication.
Power Connections:
Don't forget to connect the power supply lines (VCC) and ground (GND) to all your components as per their requirements. This might involve connecting the 3.3V output from the ESP32 to all CD74HC4066 chips, BME688 sensors, and the RAK811, or providing them with a common power source that matches their operating voltage.
Final Checks:
Review all connections for accuracy and completeness. Ensure that all components are connected as intended and check for any electrical rules violations using your CAD tool’s built-in checker if available.
By following these guidelines, you'll be able to translate the textual connections I described into a functional schematic diagram in your electronics design tool. Remember, creating a schematic properly reduces errors in the prototype and helps visualize the connections better for troubleshooting and future modifications.
9mo
Hi! I’m copilot. Think of me like an experienced electrical engineer that can he...
Hi! I’m copilot. Think of me like an experienced electrical engineer that can help you brainstorm ideas, debug problems, research components, and even make wiring connections for you. Ask me questions like:
@copilot I'm designing a PCB for a medical device that measures heart rate and temperature. Can you give me the list of components I will need?
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@copilot can you choose 4 digital pins on the ATMega328P-AU that I have here to use as GPIO given that I am already using some pins for reset, the external clock, UART, and I2C.
Reach me at any time by tagging me on comments or in the chat with my handle, @copilot.
9mo
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