# ESP32 power meter 4 ways ## Description Compact 4-channel power meter using ESP32-C3, ACS712 sensors, ADS1015 ADC, relay control and I²C connectivity for efficient energy monitoring. #PowerMeter #ESP32 #IoT #EnergyMonitoring ## Project Details - **Owner:** vasy_skral - **Created:** 5/7/2025 - **Last Updated:** 7/9/2025 - **Visibility:** Public - **License:** https://creativecommons.org/licenses/by/4.0/ - **Copies:** 1 ## Key Components ### ESP1 — [ESP32-C3-WROOM-02-N4](https://www.flux.ai/vasy_skral/esp32-c3-wroom-02-n4~tqi.md) - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf - Symbol Style: Parametric - Manufacturer Part Number: ESP32-C3-WROOM-02-N4 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Module - Manufacturer Name: Espressif Systems **Pins:** - 3V3 [pin 1] - EN [pin 2] - GND [pin 38] - GND [pin 32] - GND [pin 37] - GND [pin 22] - GND [pin 19] - GND [pin 34] - GND [pin 31] - GND [pin 21] - GND [pin 39] - GND [pin 36] - GND [pin 9] - GND [pin 25] - GND [pin 33] - GND [pin 29] - GND [pin 30] - GND [pin 28] - GND [pin 20] - GND [pin 35] - GND [pin 26] - GND [pin 24] - GND [pin 23] - GND [pin 27] - IO0 [pin 18] - IO1 [pin 17] - IO10 [pin 10] - IO18 [pin 13] - IO19 [pin 14] - IO2 [pin 16] - IO3 [pin 15] - IO4 [pin 3] - IO5 [pin 4] - IO6 [pin 5] - IO7 [pin 6] - IO8 [pin 7] - IO9 [pin 8] - RXD [pin 11] - TXD [pin 12] ### IC1 — [ULN2003APWR](https://www.flux.ai/adrian95/uln2003apwr~q48.md) - Manufacturer Part Number: ULN2003APWR - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/lit/ds/symlink/uln2003a.pdf **Pins:** - 1B [pin 1] - 1C [pin 16] - 2B [pin 2] - 2C [pin 15] - 3B [pin 3] - 3C [pin 14] - 4B [pin 4] - 4C [pin 13] - 5B [pin 5] - 5C [pin 12] - 6B [pin 6] - 6C [pin 11] - 7B [pin 7] - 7C [pin 10] - COM [pin 9] - E [pin 8] ### J1 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Part Type: Connector - Manufacturer Name: TE Connectivity AMP Connectors - Manufacturer Part Number: 282837-2 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Manufacturer Part Number: 282837-2 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Part Type: Connector - Manufacturer Name: TE Connectivity AMP Connectors **Pins:** - 1 [pin 1] - 2 [pin 2] ### J3 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Part Type: Connector - Manufacturer Name: TE Connectivity AMP Connectors - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Manufacturer Part Number: 282837-2 **Pins:** - 1 [pin 1] - 2 [pin 2] ### J4 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Part Type: Connector - Manufacturer Name: TE Connectivity AMP Connectors - Manufacturer Part Number: 282837-2 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English **Pins:** - 1 [pin 1] - 2 [pin 2] ### J5 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Manufacturer Part Number: 282837-2 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English - Part Type: Connector - Manufacturer Name: TE Connectivity AMP Connectors **Pins:** - 1 [pin 1] - 2 [pin 2] ### K1 — [SRD-05VDC-SL-C](https://www.flux.ai/vasy_skral/srd-05vdc-sl-c~go1.md) - Part Type: Relay - Manufacturer Name: Ningbo Songle Relay - Manufacturer Part Number: SRD-05VDC-SL-C - Datasheet URL: https://www.circuitbasics.com/wp-content/uploads/2015/11/SRD-05VDC-SL-C-Datasheet.pdf **Pins:** - A1 [pin A1] - A2 [pin A2] - COM [pin COM] - NC [pin NC] - NO [pin NO] ### K2 — [SRD-05VDC-SL-C](https://www.flux.ai/vasy_skral/srd-05vdc-sl-c~go1.md) - Datasheet URL: https://www.circuitbasics.com/wp-content/uploads/2015/11/SRD-05VDC-SL-C-Datasheet.pdf - Part Type: Relay - Manufacturer Name: Ningbo Songle Relay - Manufacturer Part Number: SRD-05VDC-SL-C **Pins:** - A1 [pin A1] - A2 [pin A2] - COM [pin COM] - NC [pin NC] - NO [pin NO] ### K3 — [SRD-05VDC-SL-C](https://www.flux.ai/vasy_skral/srd-05vdc-sl-c~go1.md) - Datasheet URL: https://www.circuitbasics.com/wp-content/uploads/2015/11/SRD-05VDC-SL-C-Datasheet.pdf - Manufacturer Part Number: SRD-05VDC-SL-C - Manufacturer Name: Ningbo Songle Relay - Part Type: Relay **Pins:** - A1 [pin A1] - A2 [pin A2] - COM [pin COM] - NC [pin NC] - NO [pin NO] ### K4 — [SRD-05VDC-SL-C](https://www.flux.ai/vasy_skral/srd-05vdc-sl-c~go1.md) - Datasheet URL: https://www.circuitbasics.com/wp-content/uploads/2015/11/SRD-05VDC-SL-C-Datasheet.pdf - Manufacturer Part Number: SRD-05VDC-SL-C - Manufacturer Name: Ningbo Songle Relay - Part Type: Relay **Pins:** - A1 [pin A1] - A2 [pin A2] - COM [pin COM] - NC [pin NC] - NO [pin NO] ### LED1 — [LED-0603-Template](https://www.flux.ai/vasy_skral/led-0603-template~ye5.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [LED-0603-Template](https://www.flux.ai/vasy_skral/led-0603-template~ye5.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [LED-0603-Template](https://www.flux.ai/vasy_skral/led-0603-template~ye5.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED4 — [LED-0603-Template](https://www.flux.ai/vasy_skral/led-0603-template~ye5.md) - Part Type: LED - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### PROG — [Pin Header 01x06 2.54mm Vertical](https://www.flux.ai/vasy_skral/pin-header-01x06-254mm-vertical~jyw.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### PS1 — [HLK-5M05](https://www.flux.ai/jecstronic/hlk-5m05~ry.md) - Datasheet URL: https://5.imimg.com/data5/JI/JR/RP/SELLER-1833510/hlk-5m05-power-module.pdf - Manufacturer Part Number: HLK-5M05 - Part Type: Power Source - Manufacturer Name: Hi-Link - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - -VO [pin 3] - +VO [pin 4] - AC_1 [pin 1] - AC_2 [pin 2] ### U1 — [ACS712ELCTR-20A-T](https://www.flux.ai/vasy_skral/acs712elctr-20a-t~0sj.md) - Symbol Style: Parametric - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ACS712ELCTR-20A-T - Manufacturer Name: Allegro MicroSystems - Datasheet URL: https://www.allegromicro.com/~/media/Files/Datasheets/ACS712-Datasheet.ashx **Pins:** - FILTER [pin 6] - GND [pin 5] - IP- [pin 3] - IP- [pin 4] - IP+ [pin 1] - IP+ [pin 2] - VCC [pin 8] - VIOUT [pin 7] ### U2 — [ADS1015IDGST](https://www.flux.ai/vasy_skral/ads1015idgst~793.md) - Part Type: Integrated Circuit - Manufacturer Name: Texas Instruments - Manufacturer Part Number: ADS1015IDGST - Datasheet URL: https://www.ti.com/lit/ds/symlink/ads1013.pdf **Pins:** - ADDR [pin 1] - AIN0 [pin 4] - AIN1 [pin 5] - AIN2 [pin 6] - AIN3 [pin 7] - ALERT/RDY [pin 2] - GND [pin 3] - SCL [pin 10] - SDA [pin 9] - VDD [pin 8] ### U3 — [ACS712ELCTR-20A-T](https://www.flux.ai/vasy_skral/acs712elctr-20a-t~0sj.md) - Symbol Style: Parametric - Part Type: Integrated Circuit - Manufacturer Name: Allegro MicroSystems - Datasheet URL: https://www.allegromicro.com/~/media/Files/Datasheets/ACS712-Datasheet.ashx - Manufacturer Part Number: ACS712ELCTR-20A-T - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - FILTER [pin 6] - GND [pin 5] - IP- [pin 3] - IP- [pin 4] - IP+ [pin 1] - IP+ [pin 2] - VCC [pin 8] - VIOUT [pin 7] ### U4 — [ACS712ELCTR-20A-T](https://www.flux.ai/vasy_skral/acs712elctr-20a-t~0sj.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ACS712ELCTR-20A-T - Manufacturer Name: Allegro MicroSystems - Datasheet URL: https://www.allegromicro.com/~/media/Files/Datasheets/ACS712-Datasheet.ashx - Part Type: Integrated Circuit - Symbol Style: Parametric **Pins:** - FILTER [pin 6] - GND [pin 5] - IP- [pin 4] - IP- [pin 3] - IP+ [pin 1] - IP+ [pin 2] - VCC [pin 8] - VIOUT [pin 7] ### U5 — [ACS712ELCTR-20A-T](https://www.flux.ai/vasy_skral/acs712elctr-20a-t~0sj.md) - Part Type: Integrated Circuit - Symbol Style: Parametric - Manufacturer Name: Allegro MicroSystems - Datasheet URL: https://www.allegromicro.com/~/media/Files/Datasheets/ACS712-Datasheet.ashx - Manufacturer Part Number: ACS712ELCTR-20A-T - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - FILTER [pin 6] - GND [pin 5] - IP- [pin 4] - IP- [pin 3] - IP+ [pin 1] - IP+ [pin 2] - VCC [pin 8] - VIOUT [pin 7] ### U6 — [AMS1117-3.3](https://www.flux.ai/vasy_skral/ams1117-33~34.md) - Datasheet URL: http://www.advanced-monolithic.com/pdf/ds1117.pdf - Part Type: Integrated Circuit - Manufacturer Part Number: AMS1117-3.3 - Symbol Style: Parametric - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: AMS - Manufacturer Part Number: AMS1117-3.3 **Pins:** - GND [pin 1] - TAB(VOUT) [pin 4] - VIN [pin 3] - VOUT [pin 2] ### USB — [Connector 01x04 0.100](https://www.flux.ai/vasy_skral/connector-01x04-0100~go.md) - Part Type: Connector **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/vasy_skral/esp32-power-meter-4-ways~j9](https://www.flux.ai/vasy_skral/esp32-power-meter-4-ways~j9).* --- *Generated from [https://www.flux.ai/vasy_skral/esp32-power-meter-4-ways~j9](https://www.flux.ai/vasy_skral/esp32-power-meter-4-ways~j9)*