ESP32 Health Monitoring Schematic Design

6:25

Searching: "Analog-output heart rate / pulse sensor module with three pins (VCC, GND, analog output) suitable for direct ESP32 ADC input; small PCB module or breakout similar to Pulse Sensor Amped"

Searching: "Small ECG analog front-end module with Vcc, GND and single-ended analog output compatible with 3.3V ESP32 ADC input; breakout board for wearable/health-monitoring schematic"

Searching: "GSM module based on SIM800L with schematic symbol exposing UART TX RX pins and a VIN/power pin around 4V suitable for remote monitoring"

Searching: "Analog body-temperature sensor module with VCC, GND and analog output pin, module suitable for ESP32 ADC (0-3.3V), prefer modules with header pins or breakout form factor"

Searching: "Analog-output differential pressure sensor module for blood-pressure cuff — exposes VCC, GND, and single analog voltage output; compatible with 3.3V/ESP32 ADC input"

Searching: "ESP32 Dev board (DevKit style) with accessible GPIO21, GPIO22, GPIO16, GPIO17, GPIO32, GPIO33, GPIO34, GPIO35, GPIO36 plus 5V and GND pins; standard pin headers for schematic use"

Found 13 results.

Searching: "ECG sensor analog output module for schematic use with ESP32 ADC input. Need power, ground, and analog output pins for an ESP32 health monitoring schematic. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Searching: "16x2 character LCD module with HD44780-compatible controller and an I2C backpack (PCF8574) exposing SDA, SCL, VCC and GND pins; prefer PCB-mounted module or separate backpack footprint for schematic use"

Searching: "6-axis accelerometer gyroscope I2C breakout or IC with VCC, GND, SDA and SCL pins exposed for use with ESP32 (MPU-6050 style)"

Found 29 results.

Searching: "SIM800L GSM module for schematic use. Need UART TX/RX pins and a supply connection around 4V for a remote patient monitoring design. Looking for a library component representing SIM800L or SIM800L module with power and UART pins exposed. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Found 20 results.

Searching: "MAX30102 pulse oximeter and heart rate sensor module or IC with I2C SDA and SCL pins for use in an ESP32 health monitoring schematic. Need a library component with power, ground, SDA, and SCL terminals. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Found 20 results.

Searching: "heart rate sensor analog output module for schematic use with ESP32 ADC input. Need power, ground, and analog output pin. Examples may include pulse sensor or heart beat sensor modules. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Found 12 results.

Searching: "blood pressure sensor module analog output for schematic use with ESP32 ADC input. Need power, ground, and analog output pin exposed. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Found 30 results.

Searching: "ESP32 Dev Module development board for a medical monitoring schematic. Need an ESP32 module or dev board component with accessible GPIO21, GPIO22, GPIO16, GPIO17, GPIO32, GPIO33, GPIO34, GPIO35, and GPIO36 pins, plus 5V and GND connections. Prefer a standard ESP32 DevKit style component usable in Flux schematic. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Searching: "3-pin analog temperature sensor with VCC, GND, and analog voltage output (LM35-style). Suitable for ESP32 ADC input; prefer TO-92 or SOT-23 package."

Found 22 results.

Searching: "body temperature sensor analog output module for schematic use with ESP32 ADC input. Need power, ground, and analog output pin. Could be LM35 style or dedicated body temperature sensor module. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Found 26 results.

Searching: "MPU6050 accelerometer gyroscope sensor module or IC with I2C interface for schematic use with ESP32. Need power, ground, SDA, and SCL pins exposed. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Found 11 results.

Searching: "I2C 16x2 LCD module or backpack module for schematic use, compatible with SDA and SCL bus and power pins. Need a library component representing a 16x2 LCD with I2C interface. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Found 20 results.

Searching: "LM35 temperature sensor for schematic use with ESP32 ADC input. Need a component with VCC, GND, and analog output pins. --- MANDATORY search constraints (these MUST be applied to all searches): fieldCategories: ["core","type","manufacturer","packaging"] hitsPerPage: 10"

Finished searching for components.

Reviewing the bill of materials.

Analyzing the schematic.

Searching for components.

Finished searching for components.

Running design review.

Analyzing the schematic.

Looking for "What supply pins should be connected for typical operation, especially VDD, VLED+, GND, PGND, and I2C pins SDA/SCL?" in MAX30102.pdf

Looking through a file.

Looking for "Which UART pins on SIM800L are TX and RX, and what supply pin should be powered for normal operation?" in SIM800L-Datasheet.pdf

Thinking about U8 and U9 power connections.

Evaluating component design requirements.

Running multiple web searches.

Found 10 results.

Schematic updated

I completed the requested schematic edits using direct component/net modifications and labeled-net cleanup, which is the right workflow for schematic changes in this kind of task . Here’s the incremental summary of what changed :

What I added and wired

Block	Changes
Power	Added C3 as the 1000 uF bulk capacitor on the 4V rail. Your existing C1 (100 uF) and C2 (0.1 uF) remain on the 5V rail.
GSM	Connected U4 UART to U1: TXD -> GPIO16 and RXD -> GPIO17, with nets GSM_TX and GSM_RX.
I2C bus	Added R3 and R4 as 4.7 kΩ pull-ups. Added U8 and U9 onto shared nets I2C_SDA and I2C_SCL with U1 pins GPIO21 and GPIO22.
Display interface	Added J2 as a 4-pin external display header on 5V / GND / I2C_SDA / I2C_SCL because a dedicated I2C 16x2 display module part was not available in the library.
Net labels	Renamed the analog nets to HEART_RATE_ADC, LM35_ADC, BLOOD_PRESSURE_ADC, ECG_ADC, and kept BODY_TEMP_ADC.

Current sensor mapping

Function	Connected net / GPIO
Heart rate sensor J1	HEART_RATE_ADC -> GPIO34 on U1
LM35 U5	LM35_ADC -> GPIO35 on U1
Blood pressure IC1	BLOOD_PRESSURE_ADC -> GPIO32 on U1
ECG U6	ECG_ADC -> GPIO33 on U1
Body temp U7	BODY_TEMP_ADC -> GPIO36/VP on U1
SpO2 U8	On shared I2C_SDA / I2C_SCL
MPU6050 U9	On shared I2C_SDA / I2C_SCL

Important review note

U8 is the one item that still deserves a manual review. Its datasheet indicates VDD and VLED+ use separate supply domains, so I treated it as a provisional hookup by tying its bus pins in and powering VLED+ from 5V while placing VDD on U1 3V3. If you want, I can do a follow-up pass to replace U8 with a module-level part or rework that power section more strictly around the datasheet.

One limitation

I could not place a true library symbol for the requested I2C 16x2 LCD, so J2 is acting as the organized external interface point for that display connection.

If you want, next I can:

review the remaining floating pins/ERC issues, or
tighten the U8 power implementation.

Tighten MAX30102 power

Review ERC issues

Add LCD module part

21h

Added 5 components

0:03

Added 1x MAX30102EFD+T as U8 (Pins: ~INT, SCL, VDD, VLED+::10, PGND, GND, VLED+::9, SDA)

Added 1x GY-521 as U9 (Pins: INT, SCL, AD0, SDA, XCL, XDA, VCC, GND)

Added 1x Generic Capacitor as C3 (Pins: P1, P2)

Added 2x Generic Resistor as R3, R4 (Pins: P2, P1)

21h

Added 1 component

0:02

Added 1x Pin Header 01x04 2.54mm Vertical as J2 (Pins: Pin_4, Pin_3, Pin_2, Pin_1)

21h

Updated 8 connections

0:05

Connected U4:TXD, U1:IO16 to ^GSM_TX

Connected U4:RXD, U1:IO17 to ^GSM_RX

Connected C3:P1 to ^4V

Connected C3:P2, U9:GND, J2:Pin_2, U8:GND, U8:PGND to ^GND

Connected R3:P1, R4:P1, U9:VCC, J2:Pin_1, U8:VLED+, U8:VLED+ to ^5V

Connected U9:SDA, U1:IO21, R3:P2, J2:Pin_3, U8:SDA to ^I2C_SDA

Connected U9:SCL, U1:IO22, R4:P2, J2:Pin_4, U8:SCL to ^I2C_SCL

Connected U8:VDD, U1:3V3 to ^SPO2_VDD

nets {

net ECG_ADC = U1:IO33, U6:OUT;

net GND = U1 GND - U3 GND:GND, J1 GND - U5 GND:GND, U6:GND, R2:P2, C1:P2, GND:GND, U1:20, U1:26, U8:PGND, U8:GND, C3 P2 - U9 GND:GND, C3:P2, U2:GND, J2:Pin_2, U1:14, U3:GND, C2:P2, U9:GND, U5:GND, U7:GND, J1:GND, IC1:GROUND, U4:GND;

net SPO2_VDD = U8:VDD, U1:3V3;

net I2C_SDA = R3:P2, U9:SDA, U1:IO21, J2:Pin_3, U8:SDA;

net 5V = U2:VO, U6:+VS, U5:+VS, U1:5V, U7:+VS, J1:V+, C2:P1, R4:P1, U9:VCC, J2:Pin_1, R3:P1, U8:10, U8:9, C1:P1, IC1:VCC;

net BLOOD_PRESSURE_ADC = U1:IO32, IC1:VOUT;

net BODY_TEMP_ADC = U1:VP, U7:VOUT;

net 4V = U4:VCC, C3:P1, U3:Vout, R2:P1, R1:P1;

net GSM_TX = U4:TXD, U1:IO16;

net I2C_SCL = R4:P2, J2:Pin_4, U9:SCL, U8:SCL, U1:IO22;

net HEART_RATE_ADC = J1:SIG, U1:IO34;

net GSM_RX = U4:RXD, U1:IO17;

net LM35_ADC = U1:IO35, U5:VOUT;

}

21h

Planning disabled.

Reviews

Ground
A common return path for electric current. Commonly known as ground.
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Net Portal
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Power Net Portal
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Generic Resistor
A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
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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, 10000uF 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, 220pF, 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
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Project Name

Remote Patient Health Monitoring System

Description

High-level requirements brief for a Remote Patient Health Monitoring System using an ESP32 Dev Module, separate regulated 5V and 4V rails, common grounding, and 5V rail decoupling for later schematic implementation.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$50.92–$56.28
Digi-Key	$85.75–$93.67
LCSC	$52.26–$52.48
Mouser	$74.49
TME	$2.31
Verical	$58.97–$75.97

Assets

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Controls

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