# 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. ## Project Details - **Owner:** quinten - **Created:** 6/9/2026 - **Last Updated:** 6/9/2026 - **Visibility:** Public ## Key Components ### J1 — [Pin Header for HC-SR04](https://www.flux.ai/project-x/pin-header-for-hc-sr04~88.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role Details: 4-pin HC-SR04 sensor connector; VCC is routed through channel 1 shunt. - Role: Connectivity **Pins:** - +5v [pin 1] - Echo [pin 3] - Gnd [pin 4] - Trig [pin 2] ### J2 — [1725656](https://www.flux.ai/adrian95/1725656~g1q.md) - Datasheet URL: https://www.phoenixcontact.com/product/pdf/api/v1/MTcyNTY1Ng?_realm=us&_locale=en-US&blocks=commercial-data%2Ctechnical-data%2Cdrawings%2Capprovals%2Cclassifications%2Cenvironmental-compliance-data%2Call-accessories - Manufacturer Name: Phoenix Contact - Manufacturer Part Number: 1725656 - Role Details: 5V input supply for INA3221 channel 1 monitoring path. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Symbol Style: parametric-v1 - Role: Connectivity **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J3 — [1725656](https://www.flux.ai/adrian95/1725656~g1q.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: 12V input supply for INA3221 channel 2 monitoring path. - Manufacturer Part Number: 1725656 - Manufacturer Name: Phoenix Contact - Datasheet URL: https://www.phoenixcontact.com/product/pdf/api/v1/MTcyNTY1Ng?_realm=us&_locale=en-US&blocks=commercial-data%2Ctechnical-data%2Cdrawings%2Capprovals%2Cclassifications%2Cenvironmental-compliance-data%2Call-accessories - Role: Connectivity - Part Type: Connector - Symbol Style: parametric-v1 **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J4 — [1725656](https://www.flux.ai/adrian95/1725656~g1q.md) - Symbol Style: parametric-v1 - Part Type: Connector - Role Details: 12V load output after current-sense shunt. - License: https://creativecommons.org/licenses/by/4.0/ - Role: Connectivity - Datasheet URL: https://www.phoenixcontact.com/product/pdf/api/v1/MTcyNTY1Ng?_realm=us&_locale=en-US&blocks=commercial-data%2Ctechnical-data%2Cdrawings%2Capprovals%2Cclassifications%2Cenvironmental-compliance-data%2Call-accessories - Manufacturer Part Number: 1725656 - Manufacturer Name: Phoenix Contact **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J5 — [1725656](https://www.flux.ai/adrian95/1725656~g1q.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.phoenixcontact.com/product/pdf/api/v1/MTcyNTY1Ng?_realm=us&_locale=en-US&blocks=commercial-data%2Ctechnical-data%2Cdrawings%2Capprovals%2Cclassifications%2Cenvironmental-compliance-data%2Call-accessories - Manufacturer Part Number: 1725656 - Manufacturer Name: Phoenix Contact - Role Details: 9V input supply for INA3221 channel 3 monitoring path. - Part Type: Connector - Symbol Style: parametric-v1 - Role: Connectivity **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J6 — [1725656](https://www.flux.ai/adrian95/1725656~g1q.md) - Role Details: 9V load output after current-sense shunt. - Part Type: Connector - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.phoenixcontact.com/product/pdf/api/v1/MTcyNTY1Ng?_realm=us&_locale=en-US&blocks=commercial-data%2Ctechnical-data%2Cdrawings%2Capprovals%2Cclassifications%2Cenvironmental-compliance-data%2Call-accessories - Manufacturer Name: Phoenix Contact - Manufacturer Part Number: 1725656 - Role: Connectivity **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J7 — [Pin Header 01x04 2.54mm Vertical i2c](https://www.flux.ai/hasanbasri93/pin-header-01x04-2p54mm-vertical-i2c~37.md) - Role: Connectivity - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: I2C/power header to connect INA3221 to an external host MCU. **Pins:** - 5V [pin 1] - GND [pin 2] - SCL [pin 4] - SDA [pin 3] ### U1 — [INA3221AIRGVR](https://www.flux.ai/jecstronic/ina3221airgvr~mj.md) - Manufacturer Name: Texas Instruments - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ti.com/lit/ds/symlink/ina3221.pdf - Role: Sensing (Shunt) - Role Details: Measures shunt drop and bus voltage on all three monitored supply rails via I2C. - Manufacturer Part Number: INA3221AIRGVR **Pins:** - A0 [pin 5] - CRITICAL [pin 9] - EP [pin 17] - GND [pin 3] - IN-1 [pin 11] - IN-2 [pin 14] - IN-3 [pin 1] - IN+1 [pin 12] - IN+2 [pin 15] - IN+3 [pin 2] - PV [pin 10] - SCL [pin 6] - SDA [pin 7] - TC [pin 13] - VPU [pin 16] - VS [pin 4] - WARNING [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/quinten/ina3221-hc-sr04-monitor~2x](https://www.flux.ai/quinten/ina3221-hc-sr04-monitor~2x).* --- *Generated from [https://www.flux.ai/quinten/ina3221-hc-sr04-monitor~2x](https://www.flux.ai/quinten/ina3221-hc-sr04-monitor~2x)*