# ESP32\-C3 PSU Load Tester

## Description

ESP32\-C3 monitor and relay\-controlled resistive load tester for protected 12 V / 2 A power\-supply validation\.

## Project Details

- **Owner:** sudarakalakshitha
- **Created:** 8/13/2026
- **Last Updated:** 8/13/2026
- **Visibility:** Public

## Key Components

### D1 — [1N5822RLG](https://flux.ai/lcsc/1n5822rlg~v8yy.md)

- Product Info Url: https://lcsc\.com/product\-detail/Others\_ON\-Semicon\_1N5822RLG\_ON\-Semicon\-ON\-1N5822RLG\_C232464\.html
- Functional Group: CONTROL Power,Protected Test Input / Current Sense
- Manufacturer Name: onsemi\(安森美\)
- LCSC Part Number: C232464
- Manufacturer Part Number: 1N5822RLG
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410010333\_onsemi\-1N5822RLG\_C232464\.pdf
- Part Type: Schottky Barrier Diodes \(SBD\)
- JLCPCB Part Class: Extended Part
- Package or Case Code: DO\-201AD\_BD5\.3\-L8\.4\-P12\.50\-D1\.4\-RD

**Pins:**
- A [pin 2]
- C [pin 1]

### D2 — [1N5822RLG](https://flux.ai/lcsc/1n5822rlg~v8yy.md)

- Product Info Url: https://lcsc\.com/product\-detail/Others\_ON\-Semicon\_1N5822RLG\_ON\-Semicon\-ON\-1N5822RLG\_C232464\.html
- Manufacturer Name: onsemi\(安森美\)
- LCSC Part Number: C232464
- Manufacturer Part Number: 1N5822RLG
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/lcsc/2410010333\_onsemi\-1N5822RLG\_C232464\.pdf
- Functional Group: CONTROL Power,Protected Test Input / Current Sense
- Part Type: Schottky Barrier Diodes \(SBD\)
- JLCPCB Part Class: Extended Part
- Package or Case Code: DO\-201AD\_BD5\.3\-L8\.4\-P12\.50\-D1\.4\-RD

**Pins:**
- A [pin 2]
- C [pin 1]

### F1 — [0PTF0075P](https://flux.ai/silicon-yard/0ptf0075p~v6.md)

- Part Type: Fuse
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 0PTF0075P
- Functional Group: Protected Test Input / Current Sense
- Manufacturer Name: Littelfuse Inc\.
- Datasheet URL: https://storage\.googleapis\.com/graviton\-electric\-symbols/document\_assets/user\-uploaded/bbda59552f44bd9ba43bc0c8605f8d30f062732434877647fae9792f36919c78\.pdf
- Current Rating: 6\.3A

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### F2 — [0ZRM0125FF1A](https://flux.ai/adrian95/0zrm0125ff1a~u1f.md)

- Part Type: Fuse
- Manufacturer Part Number: 0ZRM0125FF1A
- Manufacturer Name: Bel Fuse Inc\.
- Functional Group: CONTROL Power
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://belfuse\.com/media/datasheets/products/circuit\-protection/ds\-cp\-0zrm\-series\.pdf
- Current Rating: 1\.25A

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### J1 — [1729128](https://flux.ai/adrian95/1729128~gmm.md)

- Package or Case Code: 1729128
- Manufacturer Name: Phoenix Contact
- Part Type: Connector
- Functional Group: CONTROL Power,Protected Test Input / Current Sense,HOT Load Bank
- Datasheet URL: http://www\.phoenixcontact\.net/product/1729128
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 1729128

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J2 — [1729128](https://flux.ai/adrian95/1729128~gmm.md)

- Package or Case Code: 1729128
- Manufacturer Name: Phoenix Contact
- Part Type: Connector
- Datasheet URL: http://www\.phoenixcontact\.net/product/1729128
- Functional Group: CONTROL Power,Protected Test Input / Current Sense,HOT Load Bank
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 1729128

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J3 — [1729128](https://flux.ai/adrian95/1729128~gmm.md)

- Package or Case Code: 1729128
- Manufacturer Name: Phoenix Contact
- Part Type: Connector
- Datasheet URL: http://www\.phoenixcontact\.net/product/1729128
- Functional Group: CONTROL Power,Protected Test Input / Current Sense,HOT Load Bank
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 1729128

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J4 — [1729128](https://flux.ai/adrian95/1729128~gmm.md)

- Package or Case Code: 1729128
- Manufacturer Name: Phoenix Contact
- Part Type: Connector
- Functional Group: CONTROL Power,Protected Test Input / Current Sense,HOT Load Bank
- Datasheet URL: http://www\.phoenixcontact\.net/product/1729128
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 1729128

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J5 — [1729128](https://flux.ai/adrian95/1729128~gmm.md)

- Package or Case Code: 1729128
- Manufacturer Name: Phoenix Contact
- Part Type: Connector
- Functional Group: CONTROL Power,Protected Test Input / Current Sense,HOT Load Bank
- Datasheet URL: http://www\.phoenixcontact\.net/product/1729128
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 1729128

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J6 — [1729128](https://flux.ai/adrian95/1729128~gmm.md)

- Package or Case Code: 1729128
- Manufacturer Name: Phoenix Contact
- Part Type: Connector
- Datasheet URL: http://www\.phoenixcontact\.net/product/1729128
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: CONTROL Power,Protected Test Input / Current Sense,HOT Load Bank
- Manufacturer Part Number: 1729128

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### J7 — [DC\-005](https://flux.ai/cherepanyadima/dc-005.md)

- Functional Group: CONTROL Power
- Manufacturer Name: Best Inc
- Datasheet URL: https://www\.snapeda\.com/parts/DC\-005/Best%20Inc\./datasheet/
- Manufacturer Part Number: DC\-005
- Part Type: Connectors

**Pins:**
- \~ [pin 2]
- \~ [pin 4]
- \~ [pin 3]

### J8 — [Pin Header 01x06 2\.54mm Vertical](https://flux.ai/adrian95/pin-header-01x06-2p54mm-vertical~lzd.md)

- Functional Group: Relay Drivers
- 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]

### J9 — [Pin Header 01x03 2\.54mm Vertical](https://flux.ai/adrian95/pin-header-01x03-254mm-vertical~cp4.md)

- Functional Group: MCU / I2C / Sensor
- Part Type: Connector
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- Pin\_1 [pin 1]
- Pin\_2 [pin 2]
- Pin\_3 [pin 3]

### LED1 — [LTL\-307EE](https://flux.ai/vasy_skral/ltl-307ee~a2.md)

- Manufacturer Name: Lite\-On Inc\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: CONTROL Power,MCU / I2C / Sensor,HOT Load Bank
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/1153/LTL\-307EE\.pdf
- Part Type: LED
- Manufacturer Part Number: LTL\-307EE

**Pins:**
- A [pin 2]
- K [pin 1]

### LED2 — [LTL\-307EE](https://flux.ai/vasy_skral/ltl-307ee~a2.md)

- Manufacturer Name: Lite\-On Inc\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/1153/LTL\-307EE\.pdf
- Part Type: LED
- Functional Group: CONTROL Power,MCU / I2C / Sensor,HOT Load Bank
- Manufacturer Part Number: LTL\-307EE

**Pins:**
- A [pin 2]
- K [pin 1]

### LED3 — [LTL\-307EE](https://flux.ai/vasy_skral/ltl-307ee~a2.md)

- Manufacturer Name: Lite\-On Inc\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: CONTROL Power,MCU / I2C / Sensor,HOT Load Bank
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/1153/LTL\-307EE\.pdf
- Part Type: LED
- Manufacturer Part Number: LTL\-307EE

**Pins:**
- A [pin 2]
- K [pin 1]

### LED4 — [LTL\-307EE](https://flux.ai/vasy_skral/ltl-307ee~a2.md)

- Manufacturer Name: Lite\-On Inc\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/1153/LTL\-307EE\.pdf
- Part Type: LED
- Functional Group: CONTROL Power,MCU / I2C / Sensor,HOT Load Bank
- Manufacturer Part Number: LTL\-307EE

**Pins:**
- A [pin 2]
- K [pin 1]

### LED5 — [LTL\-307EE](https://flux.ai/vasy_skral/ltl-307ee~a2.md)

- Manufacturer Name: Lite\-On Inc\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: CONTROL Power,MCU / I2C / Sensor,HOT Load Bank
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/1153/LTL\-307EE\.pdf
- Part Type: LED
- Manufacturer Part Number: LTL\-307EE

**Pins:**
- A [pin 2]
- K [pin 1]

### LED6 — [LTL\-307EE](https://flux.ai/vasy_skral/ltl-307ee~a2.md)

- Functional Group: CONTROL Power,MCU / I2C / Sensor,HOT Load Bank
- Manufacturer Name: Lite\-On Inc\.
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/1153/LTL\-307EE\.pdf
- Part Type: LED
- Manufacturer Part Number: LTL\-307EE

**Pins:**
- A [pin 2]
- K [pin 1]

### Q1 — [PN2222ATF](https://flux.ai/jecstronic/pn2222atf~d16.md)

- Functional Group: Relay Drivers
- Part Type: Transistor
- Manufacturer Part Number: PN2222ATF
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: onsemi
- Datasheet URL: https://www\.onsemi\.com/pdf/datasheet/pn2222a\-d\.pdf

**Pins:**
- B [pin 2]
- C [pin 3]
- E [pin 1]

### Q2 — [PN2222ATF](https://flux.ai/jecstronic/pn2222atf~d16.md)

- Part Type: Transistor
- Manufacturer Part Number: PN2222ATF
- Functional Group: Relay Drivers
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: onsemi
- Datasheet URL: https://www\.onsemi\.com/pdf/datasheet/pn2222a\-d\.pdf

**Pins:**
- B [pin 2]
- C [pin 3]
- E [pin 1]

### Q3 — [PN2222ATF](https://flux.ai/jecstronic/pn2222atf~d16.md)

- Part Type: Transistor
- Manufacturer Part Number: PN2222ATF
- Functional Group: Relay Drivers
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: onsemi
- Datasheet URL: https://www\.onsemi\.com/pdf/datasheet/pn2222a\-d\.pdf

**Pins:**
- B [pin 2]
- C [pin 3]
- E [pin 1]

### Q4 — [PN2222ATF](https://flux.ai/jecstronic/pn2222atf~d16.md)

- Functional Group: Relay Drivers
- Part Type: Transistor
- Manufacturer Part Number: PN2222ATF
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: onsemi
- Datasheet URL: https://www\.onsemi\.com/pdf/datasheet/pn2222a\-d\.pdf

**Pins:**
- B [pin 2]
- C [pin 3]
- E [pin 1]

### Q5 — [2N4403BU](https://flux.ai/adrian95/2n4403bu~n4w.md)

- Part Type: Transistor
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://rocelec\.widen\.net/view/pdf/c6cjqzv8h4/ONSM\-S\-A0003587676\-1\.pdf
- Functional Group: MCU / I2C / Sensor
- Manufacturer Name: onsemi
- Manufacturer Part Number: 2N4403BU

**Pins:**
- B [pin 2]
- C [pin 1]
- E [pin 3]

### RSH1 — [HoJLR2512\-3W\-10mR\-1%](https://flux.ai/lcsc/hojlr2512-3w-10mr-1percent~3edy.md)

- Resistance: 10mΩ
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Chip Resistor \- Surface Mount
- Manufacturer Part Number: HoJLR2512\-3W\-10mR\-1%
- Functional Group: Protected Test Input / Current Sense
- Datasheet URL: https://www\.lcsc\.com/datasheet/C2903468\.pdf?spm=wm\.sxq\.inf\.ggs&lcsc\_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1RaVFZRRVRaUjsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D
- Tolerance: ±1%
- Power: 3W
- Manufacturer Name: Milliohm\(毫欧\)
- LCSC Part Number: C2903468
- Resistor Type: Current Sense Resistors / Shunt Resistors ROHS
- Package or Case Code: RES\-SMD\_L6\.4\-W3\.2\-R2512
- JLCPCB Part Class: Extended Part

**Pins:**
- 1 [pin 1]
- 2 [pin 2]

### U1 — [ESP32\-C3\-DEVKITM\-1](https://flux.ai/adrian95/esp32-c3-devkitm-1.md)

- Mount: Through Hole
- Connector Rows: 2
- Package or Case Code: DEVKIT\-2X15\-2\.54MM
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: MCU / I2C / Sensor
- Part Type: Development Board
- Package: ESP32\-C3\-DevKitM\-1 dev board, 2x15 2\.54mm headers
- Connector Pitch: 2\.54mm
- Manufacturer Name: Espressif
- Symbol Style: parametric\-v1
- Connector Positions: 30
- Manufacturer Part Number: ESP32\-C3\-DEVKITM\-1
- Datasheet URL: https://docs\.espressif\.com/projects/esp\-dev\-kits/en/latest/esp32c3/esp32\-c3\-devkitm\-1/user\_guide\.html

**Pins:**
- 3V3 [pin 2]
- 3V3 [pin 3]
- 5V [pin 13]
- 5V [pin 14]
- GND [pin 19]
- GND [pin 1]
- GND [pin 16]
- GND [pin 8]
- GND [pin 6]
- GND [pin 15]
- GND [pin 24]
- GND [pin 12]
- GND [pin 27]
- GND [pin 30]
- IO0 [pin 9]
- IO1 [pin 10]
- IO10 [pin 11]
- IO18 [pin 18]
- IO19 [pin 17]
- IO2 [pin 4]
- IO3 [pin 5]
- IO4 [pin 20]
- IO5 [pin 21]
- IO6 [pin 22]
- IO7 [pin 23]
- IO8 [pin 25]
- IO9 [pin 26]
- RST [pin 7]
- RX [pin 28]
- TX [pin 29]

### U2 — [1085](https://flux.ai/cherepanyadima/1085.md)

- Datasheet URL: https://www\.snapeda\.com/parts/1085/Adafruit%20Industries/datasheet/
- Functional Group: MCU / I2C / Sensor
- Symbol Style: parametric\-v1
- Manufacturer Part Number: 1085
- Manufacturer Name: Adafruit
- Part Type: Development Boards

**Pins:**
- A\- [pin JP1\_6]
- A\+ [pin JP1\_1]
- A0 [pin JP1\_5]
- A1 [pin JP1\_4]
- A2 [pin JP1\_3]
- A3 [pin JP1\_2]
- ADDR [pin JP2\_5]
- ALRT [pin JP2\_6]
- GND [pin JP2\_2]
- SCL [pin JP2\_3]
- SDA [pin JP2\_4]
- SHIELD [pin SH3]
- SHIELD [pin SH4]
- SHIELD [pin SH2]
- SHIELD [pin SH1]
- VIN [pin JP2\_1]

### U3 — [INA226](https://flux.ai/kicad-part-library/ina226~6yg.md)

- Functional Group: Protected Test Input / Current Sense
- Manufacturer Name: Texas Instruments Inc\.
- Manufacturer Part Number: INA226
- Datasheet URL: http://www\.ti\.com/lit/ds/symlink/ina226\.pdf
- Package or Case Code: VSSOP\-10\_3x3mm\_P0\.5mm

**Pins:**
- \~\{Alert\} [pin 3]
- A0 [pin 2]
- A1 [pin 1]
- GND [pin 7]
- SCL [pin 5]
- SDA [pin 4]
- Vbus [pin 8]
- Vin\- [pin 9]
- Vin\+ [pin 10]
- VS [pin 6]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/sudarakalakshitha/esp32\-c3\-psu\-load\-tester\~rk](https://flux.ai/sudarakalakshitha/esp32-c3-psu-load-tester~rk).*

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*Generated from [https://flux\.ai/sudarakalakshitha/esp32\-c3\-psu\-load\-tester\~rk](https://flux.ai/sudarakalakshitha/esp32-c3-psu-load-tester~rk)*