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what about the other remaining pins on the oximeter?

duncanpro64

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

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.

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using 4.7kohm explain how connect the temperature sensor with the pic16f877a in...

asiago

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

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:

Connect the Ground (GND) pin of the DS18B20 sensor (U2) to the Ground (VSS_1 or VSS_2) pin of the PIC16F877A (U1).
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.
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.
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.

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i want to connect the ad8232 with pic16f877a how do i connect the pins does a re...

asiago

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

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.

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

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.

asiago

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

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:

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.
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.

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.

Connect the GND pins of the two modules (U4:16 to U1:VSS_2 or U1:VSS_1).
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.

asiago

if an0 pi is used which other pin can be used

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:

RA1/AN1 (U1:3): This is the next analog input pin after AN0.
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.
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.
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).
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.

asiago

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

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.

asiago

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

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.

Someone is typing...

connect the max30102 with the pic16f877a and indicate the pins

asiago

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

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.

Someone is typing...

Reviews

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