Chat

Welcome to Flux

Treat Flux like your intern. Tell it what you'd like to build and it'll get to work. You can also ask it questions, brainstorm ideas, and teach it your preferences. Learn More

Explain project
Write a project description
Find schematic issues
Create a test plan

Ready.

Sign up to send
U3
what about the other remaining pins on the oximeter?
duncanpro64

duncanpro64

@copilot what about the other remaining pins on the oximeter?
2y

copilot

The MAX30102 Oximeter sensor (U3) has pins besides those depicted in the provided schematic. Here's an example of how they could typically be used:
  • SCL (pin 2) and SDA (pin 3): These are the I2C interface pins. SCL is the clock line, and SDA is the data line. They should be connected to the same lines on your microcontroller.
  • GND (pin 12): This is the ground pin; it should be connected to the ground of your device/circuit.
  • VDD (pin 11): This is the power supply pin. It should be connected to the +3.3V power supply.
  • R_DRV (pin 5) and IR_DRV (pin 6): These two pins drive the red and infrared LEDs respectively. If you are not using these LEDs, these pins should be left disconnected.
  • VLED+ (pins 9 and 10) should be connected to a proper voltage driver supply if you use the onboard Leds. If you're not making use of them, they could be left unconnected.
  • ~INT (pin 13) is the interrupt pin which could be used for an interrupt-driven readout. This pin is active low. If you're not using interrupt based readout, it can be left unconnected.
  • NC (pins 1, 7, 8 and 14): These are No Connection pins and should be left disconnected.
In your current project, SCL, SDA, GND, and VDD of the MAX30102 are already connected as mentioned above. The ~INT pin is also connected to U1:(RB0/INT) of the microcontroller, likely for interrupt-driven readout.
It seems like you're not using the LEDs driven by R_DRV (pin 5) and IR_DRV (pin 6) or the VLED+ (pins 9 and 10). If that's not your intention, please let me know so I can advise on connecting those pins, or any other specific pins you want me to consider.
2y
Someone is typing...
using 4.7kohm explain how connect the temperature sensor with the pic16f877a in...
asiago

asiago

@copilot using 4.7kohm explain how connect the temperature sensor with the pic16f877a indicating the pins
2y

copilot

Sure, I'd be glad to help you with that. To do the electrical connection between the Microchip PIC16F877A microcontroller (U1) and the DS18B20 digital thermometer temperature sensor from UMW (U2), a typical setup might be as follows:
  1. Connect the Ground (GND) pin of the DS18B20 sensor (U2) to the Ground (VSS_1 or VSS_2) pin of the PIC16F877A (U1).
  2. Connect the Data I/O (DQ) pin of the DS18B20 sensor (U2) to one of the IO pins of the PIC16F877A (U1), such as (RA0/AN0). Please note that you might want to change the IO pin based on your specific firmware code and configuration.
  3. Apply a pull-up resistor to the DQ line of DS18B20. As per your question, you can use the 4.7kOhm resistor (R1). One end of R1 (either P1 or P2) connect to the same IO pin of PIC16F877A, the other end of this resistor (whichever is left) should be connected to your power source VDD_1 or VDD_2 of PIC16F877A.
  4. Connect the VDD pin of the DS18B20 sensor (U2) to the positive supply voltage (VDD_1 or VDD_2) pin of the PIC16F877A (U1).
Please remember to keep track of all the IO pin usage in your project, for each MicroController I/O pin, you should only connect one Device I/O pin. Also be aware of the current rating of each pin, don't exceed the maximum capacitance.
Here's a brief summary of the connections:
  • U1 VSS_1 (or VSS_2) ↔ U2 GND
  • U1 RA0/AN0 ↔ U2 DQ, ↔ R1 P1
  • R1 P2 ↔ U1 VDD_1 (or VDD_2)
  • U1 VDD_1 (or VDD_2) ↔ U2 VDD
Do note that you might have to adjust these based on your firmware and overall system needs. If they don't match your system needs, please provide additional details so I can present a more accurate setup.
2y
Someone is typing...
5
i want to connect the ad8232 with pic16f877a how do i connect the pins does a re...
asiago

asiago

@copilot is it okay to re use vdd to connect the vs of the ad8232
2y

copilot

The VDD pin generally serves as the power supply input for a device.
In the case of your design, you've provided the information about the voltage requirement for MAX30102EFD+T (U3) and PIC16F877A-I/P (U1), which are both connected to VDD. However, you didn't provide the voltage requirement for AD8232ACPZ-RL (U4). The AD8232ACPZ-RL typically operates at a voltage between 2.0 and 3.3 V.
Assuming your VDD provides a suitable voltage for all these devices, you can connect the VDD pin of the PIC16F877A-I/P (U1) and MAX30102 (U3) together with +VS of AD8232ACPZ-RL (U4). However, you should make sure the voltage supply can provide enough current to power all of these devices simultaneously, and that the noise levels on this line are within the tolerance of all these devices.
If the voltage supply is not the same or if one component requires significantly lower noise levels than the others, it may be necessary to include additional voltage regulation circuitry or consider separate power supplies.
Always refer to the data sheet of your specific components for precise information about their power and noise requirements.
2y
asiago

asiago

@copilot have already used vss1 and vss2 what other alternative do i need to connect the ground of @copilot have already used vss1 and vss2 what other alternative do i need to connect the ground of ad8232 with the pic16f877a
2y

copilot

The PIC16F877A microcontroller (U1) does not have any more dedicated ground pins other than VSS_1 and VSS_2. However, since circuit ground is a common reference potential in your circuit, you can share the ground (common return path for current) amongst all the components in the circuit.
It seems that U1's VSS_1 pin is already connected to the MAX30102EFD+T (U3)'s GND pin according to Net: 89cd4dde094bc6c94aae6156b91edec3 and VSS_2 is connected to DS18B20 (U2)'s GND pin according to Net: d59f5351da15e2fa8f1984802f7e1a62.
To establish a ground connection for the AD8232ACPZ-RL (U4), you can connect its GND pin to either Net: 89cd4dde094bc6c94aae6156b91edec3 or Net: d59f5351da15e2fa8f1984802f7e1a62. This way, U4's ground will also be connected to U1's ground.
In schematics, all ground symbols are usually connected by default, unless they are specifically marked as isolated grounds. It's always crucial to ensure all your components share a common ground to prevent potential ground loops or noise issues.
2y
asiago

asiago

@copilot i want to connect the ad8232 with pic16f877a how do i connect the pins does a resistor needed
2y

copilot

Yes, you can connect the AD8232's heart rate monitor output to the PIC16F877A using a resistor divider to scale the AD8232's output voltage to a level acceptable by the PIC16F877A's ADC input. In this case, let's make the following assumptions:
  • The PIC's ADC input pin can handle 0-5V.
  • The AD8232's OUT pin has a typical amplitude of +/- 1.5V around a midpoint of 1.5V (so fully swings between 0V and 3V).
Here are the steps to connect the AD8232 to the PIC16F877A:
  1. Connect the OUT pin of the AD8232 (U4:10) to one of the analog capable input pins of the PIC16F877A (U1). For example, you could use RA0/AN0 (U1:2) as the ADC input.
  2. Construction of voltage divider:
  • Connect a resistor (let's call it R2) between AD8232's OUT (U4:10) and PIC16F877A's RA0/AN0 (U1:2).
  • Connect another resistor (let's call it R3) from PIC16F877A's RA0/AN0 (U1:2) to the Ground.
  1. Set the values of resistors in the voltage divider to make sure the maximum output voltage of AD8232 (3V) will not exceed the maximum voltage acceptable by the PIC16F877A's ADC (5V).
You already have a 4.7kOhm resistor (R1) in your project, but depending upon the input voltage range of AD8232, you might need to use different values for R2 and R3.
  1. Connect the GND pins of the two modules (U4:16 to U1:VSS_2 or U1:VSS_1).
  2. Connect the +VS pin of AD8232 (U4:17) to the VDD_1 or VDD_2 pin of the PIC16F877A (U1).
By properly choosing the resistor values for the voltage divider, we can ensure that the analog input to the PIC16F877A's ADC will be within its input voltage range even if the AD8232's output is at its maximum value.
Please adapt these instructions as required for your specific design constraints and assumptions. Let me know if you have any more questions on this connection or anything else.
2y
asiago

asiago

if an0 pi is used which other pin can be used
2y

copilot

If the AN0 pin (RA0/AN0 - U1:2) on the PIC16F877A is used and you need another Analog to Digital Converter (ADC) input, you could use any of the other analog capable pins on the PIC16F877A. Here are the possible alternative pins with their designator numbers:
  1. RA1/AN1 (U1:3): This is the next analog input pin after AN0.
  2. RA2/AN2/VREF-/CVREF (U1:4): Along with being an analog input, this pin also has other functions related to voltage reference and comparator voltage reference.
  3. RA3/AN3/VREF+ (U1:5): Along with being an analog input, this pin also serves as the positive voltage reference for the A/D Converter and the comparator voltage reference.
  4. RA5/AN4/SS/C2OUT (U1:7): This pin also serves as an analog input along with other digital functions. It also serves as the output of the second comparator module (C2OUT).
  5. RE0/RD/AN5 (U1:8), RE1/WR/AN6 (U1:9), RE2/CS/AN7 (U1:10): These are additional analog inputs that are also part of the PORT E. They also serve other digital functions.
Remember to ensure that you set the related register bits appropriately in the PIC16F877A to use these pins as analog inputs.
2y
asiago

asiago

how do i creat a voltage divide which resistor ohm do i need
2y

copilot

To create a voltage divider to appropriately scale the output voltage of the AD8232 for the ADC input of the PIC16F877A, you'll need to choose resistor values that fulfill the following equation:
[ V_{out} = V_{in} \times \frac{R2}{R1 + R2} ]
Here, (V_{in}) would be the typical maximum output voltage from the AD8232 (around 3V), and (V_{out}) would be the maximum voltage acceptable by the PIC16F877A's ADC (usually 5V).
However, this configuration seems to be improper because the output of AD8232 is less than the PIC16F877A's maximum voltage.
Considering the typical operation of a voltage divider with the AD8232 outputting a maximum of 3.3V and the PIC16F877A accepting up to 5V, it's actually unnecessary. The PIC16F877A should correctly interpret the 3.3V maximum output from the AD8232 without requiring voltage scaling for safety, but you may want to include capacitors around ADC/TIA inputs for filtering, not a resistor in this case.
Please check the datasheets of the ICs for desirable voltage levels and consult a hardware engineer to validate the need for a voltage divider in your specific case.
2y
asiago

asiago

what type of resistor rating is needed to connect ad8232 with the pic16f877a
2y

copilot

In connecting the AD8232 to the PIC16F877A microcontroller, the resistor is not primarily used for voltage division or modulation, but is meant to ensure limited current flow and impedance matching. The typical ratings that should be considered are:
  • Ohmic Value (Resistance): For digital signal lines, a 10kΩ pull-up resistor is frequently used. However, this is not necessary in this case as we're dealing with an analog signal and not an I2C or digital signal line.
  • Power Rating: For most signal and general-purpose lines, a 1/4W resistor rating will be more than sufficient.
  • Tolerance: A rate of ±5% or ±1% can be widely used, not needing a precision resistor.
However, as mentioned before, there's no specific need for a resistor while connecting the output of the AD8232 to the input of the PIC16F877A's ADC. The output voltage level of the AD8232 is within the tolerable range of the PIC16F877A's ADC inputs, so you don't have to scale or limit the voltage using a resistor.
Please feel free to reach out if you need any further clarification or assistance.
2y
Someone is typing...
10
connect the max30102 with the pic16f877a and indicate the pins
asiago

asiago

@copilot connect the max30102 with the pic16f877a and indicate the pins
2y

copilot

Sure, to connect the MAX30102 (U3) sensor with the PIC16F877A (U1), you would typically connect them as follows:
  • Connect the SCL pin of the MAX30102 (U3) to the RC3/SCK/SCL pin of the PIC16F877A (U1). This connection is for the clock signal for I2C communication.
  • Connect the SDA pin of the MAX30102 (U3) to the RC4/SDI/SDA pin of the PIC16F877A (U1). This connection is for the data line for I2C communication.
  • Connect the ~INT pin of the MAX30102 (U3) to one of the IO pins on the PIC16F877A (U1) such as RB0/INT. This line is used for the MAX30102 to signal the MCU that data is ready.
  • Connect the GND pin of the MAX30102 (U3) to a VSS of the PIC16F877A. This is necessary to common the ground between the sensor and the microcontroller.
  • Connect VDD pin of the MAX30102 (U3) to a VDD of the PIC16F877A. This is to power the sensor.
Remember, the exact pin to use on the PIC16F877A might vary depending on other connections in the system or specific programming requirements. Adjust your design as needed! These are guidelines and you may need to adjust according to your specific needs.
2y
Someone is typing...
6
  • Ground
    Ground
    A common return path for electric current. Commonly known as ground.
    jharwinbarrozo
    20.5M
  • Net Portal
    Net Portal
    Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
    jharwinbarrozo
    43.0M
  • Power Net Portal
    Power Net Portal
    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 #power
    jharwinbarrozo
    11.4M
  • Generic Resistor
    Generic Resistor
    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 #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Capacitor
    Generic Capacitor
    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 #CommonPartsLibrary
    jharwinbarrozo
    1.5M
  • Generic Inductor
    Generic Inductor
    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
    jharwinbarrozo
    15.3k
  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
    natarius
  • RMCF0805JT47K0
    RMCF0805JT47K0
    47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
    jharwinbarrozo
    1.2M
  • 875105359001
    875105359001
    10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
    jharwinbarrozo
    1.2M
  • CTL1206FYW1T
    CTL1206FYW1T
    Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
    jharwinbarrozo
    1.1M

Inspect

MI_CARE E-HEALTH CIRCUIT DIAGRAM

MI_CARE E-HEALTH CIRCUIT DIAGRAM
Created
Last updated by asiago
2 Contributor(s)
asiago
duncanpro64

Controls

Properties

Availability & Pricing

DistributorQty 1
Digi-Key$19.34–$26.82
LCSC$15.32–$15.42
Mouser$22.05

Assets