INA3221 Circuit Design for Multiple Sensors

i want to measure the 5v hc sr04, i want to measure another 12v compoent and another 9v compoent, make the cuircuit so i can measure all 3 of those

Thought for 8 sec

flux

Got it — I’ll revise this to use all three INA3221 channels: one each for 5V HC-SR04, 12V load, and 9V load, with separate shunts and load connectors. I’m continuing with that updated schematic.

Worked for 3 mins 30 sec

flux

I updated the project to INA3221 HC-SR04 Monitor and built the core schematic for measuring three rails with one INA3221:

Channel 1: 5V HC-SR04 current + voltage via R1 shunt
Channel 2: 12V external component current + voltage via R2 shunt
Channel 3: 9V external component current + voltage via R3 shunt
Added connectors for 5V input, 12V input/load, 9V input/load, HC-SR04, and host MCU I2C.
Added INA3221 decoupling and I2C pull-ups.
Wired INA3221 logic supply, I2C, shunts, monitored rails, and grounds.

I was stopped by the platform credit limit before I could run the schematic review/ERC and fix any remaining warnings. The main remaining work is to verify pin connectivity, confirm the unused INA3221 alert pins are no-connect as intended, run review checks, and clean up any ERC issues.

Run ERC/DRC

Add input protection

Check shunt values

Add screw terminals

Create BOM

J3 Pin_1 - R2 P1

R1 P2 - U1 IN-1

R3 P2 - U1 IN-3

HCSR04_TRIG

HCSR04_ECHO

J2 Pin_1 - R1 P1

U1 EP - U1 A0

GND

U1 EP - U1 A0

Reviews

Generic Inductor
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
jharwinbarrozo
16.2k
Generic Capacitor
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jharwinbarrozo
1.5M
Generic Resistor
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jharwinbarrozo
1.5M
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A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
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
RMCF0805JT47K0
General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
jharwinbarrozo
1.2M
875105359001
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jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
jharwinbarrozo
1.1M
1070TR
Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlink
jharwinbarrozo
700.5k

Project Name

INA3221 HC-SR04 Monitor

Description

INA3221 current and voltage monitor interface for an HC-SR04 ultrasonic sensor, with 5V sensor power routed through a shunt and I2C output to a host MCU.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$7.90–$9.58
Digi-Key	$11.46
HQonline	$6.64
LCSC	$7.02
Mouser	$10.67
TME	$8.30
Verical	$8.11–$12.45

Controls

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quinten / INA3221 HC-SR04 Monitor

Schematic