Load Demand Response System
About the Load Demand Response System PCB
Load Demand Response System is an open source ESP32 PCB design by jsitech4, published on GitHub. It is a 4-layer board measuring 198.1 × 130.8 mm, with 133 components from 66 distinct parts.
Its main chip is the ESP32-WROOM, from the ESP32 family. Other key parts include the LM2596S-3.3V, LM2596S-12V, LM2596S-5V, AMS1117-3.3 and PCA9555D. By type, the board carries 30 diodes, 27 capacitors, 22 resistors, 17 connectors, 13 relays and 7 ICs.
It belongs with the iot & wireless and displays & leds designs in this gallery.
From the project
This project is a modular Load Demand Response System built around the ESP32-WROOM-32 using a structured PlatformIO architecture.
This project is a modular Load Demand Response System built around the ESP32-WROOM-32 using a structured PlatformIO architecture.
The system monitors the real electrical load using a PZEM-004T v3.0 energy meter and automatically manages household loads between the inverter supply and PHCN/Grid supply based on:
- Actual measured load power - User-configured inverter power rating - User-configured load margin percentage - User-configured power value for each load - PHCN/Grid availability - Inverter availability
Main components on the Load Demand Response System
Load Demand Response System bill of materials (BOM)
133 components, 66 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LM2596S-3.3V | TO-263-5_L10.2-W8.9-P1.70-TL | U1 |
| 1 | LM2596S-12V LM2596S-12 | TO-263-5_L10.2-W8.9-P1.70-TL | U2 |
| 1 | ESP32-WROOM | ESP32-WROOM-32E | U3 |
| 1 | LM2596S-5V | TO-263-5_L10.2-W8.9-P1.70-TL | U4 |
| 1 | AMS1117-3.3 | SOT-223-3_L6.5-W3.4-P2.30-LS7.0-BR | U5 |
| 1 | PCA9555D | SOIC-24W_7.5x15.4mm_P1.27mm | U6 |
| 1 | CH340C | SOIC-16_3.9x9.9mm_P1.27mm | U7 |
| 2 | UMH3N | SOT-363_SC-70-6 | Q1, Q2 |
| 2 | ULN2803ADWR Texas Instruments | SOIC-18_W7.5mm | Q3, Q4 |
| 1 | 12MHZ 12MHz | CRYSTAL-SMD_L11.5-W4.8-LS12.7 | Y1 |
| 1 | NEPA | TestPoint_Plated_Hole_D5.0mm | J1 |
| 1 | INVERTER | TestPoint_Plated_Hole_D5.0mm | J2 |
| 1 | CT | PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | PZEM_LOAD | TerminalBlock_MaiXu_MX126-5.0-04P_1x04_P5.00mm | J6 |
| 1 | N | TestPoint_Plated_Hole_D5.0mm | J10 |
| 1 | PZEM_SIG | PinHeader_1x04_P2.54mm_Vertical | J11 |
| 1 | USB_C Conn | PinHeader_1x04_P2.54mm_Vertical | J14 |
| 1 | TRANS 1-OUT | TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J15 |
| 1 | TRANS-IN | TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J17 |
| 1 | TRANS 2-OUT | TerminalBlock_Phoenix_PT-1,5-2-5.0-H_1x02_P5.00mm_Horizontal | J18 |
Show 46 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | DISPLAY | PinHeader_1x12_P2.54mm_Vertical | J19 |
| 1 | LOAD 6 | TestPoint_Plated_Hole_D5.0mm | J20 |
| 1 | LOAD 5 | TestPoint_Plated_Hole_D5.0mm | J21 |
| 1 | LOAD 4 | TestPoint_Plated_Hole_D5.0mm | J22 |
| 1 | LOAD 3 | TestPoint_Plated_Hole_D5.0mm | J23 |
| 1 | LOAD 2 | TestPoint_Plated_Hole_D5.0mm | J24 |
| 1 | LOAD 1 | TestPoint_Plated_Hole_D5.0mm | J25 |
| 1 | CMZ12 | D_SOD-123 | DZ1 |
| 2 | ~ | SolderJumper-3_P1.3mm_Open_Pad1.0x1.5mm | JP1, JP2 |
| 1 | ~ | SolderJumper-2_P1.3mm_Open_Pad1.0x1.5mm | JP3 |
| 1 | 10A/12V 10A RELAY | Relay_SPDT_Finder_36.11 | K1 |
| 12 | 30A/12V 30A RELAY | Relay_SPDT_RAYEX-L90 | K2, K3, K4, K5, K6, K7, K8, K9 +4 |
| 2 | PC817XFP | SOP-4_4.4x2.6mm_P1.27mm | OC1, OC2 |
| 1 | 10K | Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | RESET | SW_TS-1088-AR02016 | SW1 |
| 1 | SPST_CK_KXT3 FLASH | SW_TS-1088-AR02016 | SW2 |
| 1 | Blue | LED_D3.0mm | D1 |
| 2 | 1N5824 | D_SMA | D2, D3 |
| 2 | Green | LED_D3.0mm | D4, D17 |
| 17 | SM4001 | D_SMA | D5, D6, D7, D10, D11, D18, D19, D20 +9 |
| 2 | GBU8M | Diode_Bridge_Vishay_GBU | D8, D9 |
| 1 | 1N5824 | D_SMA | D12 |
| 2 | 1N5819 | D_SMA | D13, D14 |
| 2 | SM4007PL | D_SMA | D15, D30 |
| 1 | Red | LED_D3.0mm | D16 |
| 3 | 33UH 33uH | L_12x12mm_H6mm | L1, L2, L3 |
| 3 | 680UF/35V 680uF_35V | CP_Elec_10x12.5 | C1, C2, C7 |
| 1 | 470NF 470nF | C_0805 | C3 |
| 8 | 100NF 100nF | C_0805 | C4, C12, C13, C18, C22, C23, C24, C25 |
| 3 | 220UF/16V 220uF_16V | CP_Elec_6.3x7.7 | C5, C6, C11 |
| 1 | 145J400V | C_Rect_L19.0mm_W6.0mm_P15.00mm_MKS4 | C8 |
| 2 | 2200UF/35V 2200uF/35V | CP_Radial_D18.0mm_P7.50mm | C9, C10 |
| 1 | 470UF/25V 470uF/25V | CP_Elec_8x11.9 | C14 |
| 1 | 4.7UF/16V 4.7uF/16V | C_CASE-B-3528-21(mm) | C15 |
| 3 | 10uF_16V | C_CASE-B-3528-21(mm) | C16, C26, C27 |
| 1 | 0.1uF/25V | C_0805 | C17 |
| 1 | 4.7UF/16V 4.7uF/16V | CP_EIA-3216-18_Kemet-A | C19 |
| 2 | 22PF 22pF | C_0805 | C20, C21 |
| 3 | 680K 680k | R_0805 | R1, R2, R7 |
| 1 | 100K 100k | R_0805 | R3 |
| 3 | 6.8k | R_0805 | R4, R5, R8 |
| 5 | 330R | R_0805 | R6, R9, R11, R19, R20 |
| 7 | 10K 10k | R_0805 | R10, R12, R15, R16, R17, R21, R22 |
| 1 | 1M | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13 |
| 1 | 330R/2W | R_Axial_DIN0309_L9.0mm_D3.2mm_P20.32mm_Horizontal | R14 |
| 1 | 150R | R_0805 | R18 |
Load Demand Response System design files
The KiCad project lives in the jsitech4/Projects repository on GitHub; these links point at the commit this page was built from.
Load Demand Response System: common questions
What microcontroller does the Load Demand Response System use?
The Load Demand Response System is built around the ESP32-WROOM, from the ESP32 family.
How big is the Load Demand Response System PCB?
The Load Demand Response System measures 198.1 × 130.8 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Load Demand Response System?
133 components, from 66 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Load Demand Response System design files?
From the jsitech4/Projects repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Load Demand Response System design in my own project?
The repository has no license, so all rights stay with jsitech4. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Load Demand Response System without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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