ESP32 master
About the ESP32 master PCB
ESP32 master is an open source ESP32 PCB design by kwiecinski, published on GitHub under the MIT license. It is a 2-layer board measuring 99.5 × 99.5 mm, with 153 components from 69 distinct parts.
Its main chip is the ESP32_DevKit_V1_DOIT, from the ESP32 family. Other key parts include the PCF8574, ST485, AMS1117-5.0, L7812 and INA226. By type, the board carries 66 resistors, 21 capacitors, 17 diodes, 13 connectors, 12 ICs and 12 transistors.
It belongs with the iot & wireless, power & battery and sensors designs in this gallery.
From the project
Project contains BMS for lead-acid batteries and ESP-based board used to pull information from EASUN offgrid inverter, energy meters and sensors. It show informations od displays and use ESPhome to send it to Home Assistant..
1. Photovoltaic modules 2. Concrete base mounting 3. Metalworking and welding mounting bases and angle bar 4. Painting mounting base, angle bars and perforated profiles 5. PV mountings to perforated profiles 6. Assembly of PV installation 7. Fully assembled PV installation 8. Underground Cable Installation and Connection to the Building
B. EASUN inverter - description, installation schematic and wiring #### C. Managemenet system part: - BMS for lead-acid batteries - equalize battery, protect from large charge/discharge currents, montors battery state (temp, voltage) - ESP32 Master module -…
Main components on the ESP32 master
ESP32 master bill of materials (BOM)
153 components, 69 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | PCF8574 | DIP-16_W7.62mm_LongPads | U1 |
| 1 | ST485 | SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | AMS1117-5.0 | SOT-223-3_TabPin2 | U3 |
| 1 | L7812 | TO-220-3_V_Thick_Pads | U4 |
| 1 | ESP32_DevKit_V1_DOIT | esp32_devkit_v1_doit | U5 |
| 2 | INA226 | VSSOP-10_3x3mm_P0.5mm | U6, U8 |
| 1 | MAX3232 | SO-16_3.9x9.9mm_P1.27mm | U7 |
| 1 | UP7760 | SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.81mm | U9 |
| 2 | ST485EBDR | SOIC-8_3.9x4.9mm_P1.27mm | U10, U11 |
| 1 | 74HC14 | SOIC-14_3.9x8.7mm_P1.27mm | U12 |
| 2 | LM2596-Step-Down | LM2596-Step-Down-Conv | MOD1, MOD2 |
| 9 | BC817 | SOT-23 | Q1, Q2, Q3, Q5, Q8, Q9, Q10, Q11 +1 |
| 1 | BC556 | TO-92_Inline | Q4 |
| 2 | BSS138 | SOT-23 | Q6, Q7 |
| 1 | OR-OR SMOKE SENSOR | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J1 |
| 1 | LCD_DISP | JST_EH_B5B-EH-A_1x05_P2.50mm_Vertical | J2 |
| 1 | 7SEG_DISP | JST_EH_B5B-EH-A_1x05_P2.50mm_Vertical | J3 |
| 1 | RS485 | JST_XH_B4B-XH-A_1x04_P2.50mm_Vertical | J4 |
| 1 | DHT22 | PinHeader_1x03_P2.54mm_Vertical | J5 |
| 1 | DC_LINE_OUTPUT | Screw-Terminal-P6-rast-5mm-6,7x30 | J6 |
Show 49 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MAIN_BATT_+24V | Screw-Terminal-P2-rast-5mm-6,7x30 | J7 |
| 1 | MAIN_BATT_SHUNT | JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J8 |
| 1 | CO_SENSOR | PinHeader_1x03_P2.54mm_Vertical | J10 |
| 1 | H2_SENSOR | PinHeader_1x03_P2.54mm_Vertical | J11 |
| 1 | EXTERNAL_SIGNALS | CDDC-1,5-5-PV-3,5 | J12 |
| 1 | METER_GRID | JST_EH_B4B-EH-A_1x04_P2.50mm_Vertical | J13 |
| 1 | METER_PV | JST_EH_B4B-EH-A_1x04_P2.50mm_Vertical | J14 |
| 1 | 2A | Fuseholder_Clip-5x20mm_Eaton_1A5601-01_Inline_P20.80x6.76mm_D1.70mm_Horizontal | F1 |
| 1 | 2A | Fuse_2512_6332Metric_Pad1.52x3.35mm_HandSolder | F2 |
| 1 | Fuse | Fuseholder_Clip-5x20mm_Eaton_1A5601-01_Inline_P20.80x6.76mm_D1.70mm_Horizontal | F3 |
| 1 | EXTERNAL_POWER_SUPPLY_STATUS | JST_EH_B2B-EH-A_1x02_P2.50mm_Vertical | JE1 |
| 1 | Jumper_2_Bridged | SolderJumper-2_P1.3mm_Bridged2Bar_Pad1.0x1.5mm | JP1 |
| 1 | G5G-1A-DT1 | G5G-1A-DT1 | K1 |
| 1 | BUZZER | Buzzer | LS1 |
| 1 | SW_Push | JST_XA_B02B-XASK-1_1x02_P2.50mm_Vertical | SW1 |
| 2 | LED | LED_PLCC-2_3.4x3.0mm_KA | LED1, LED2 |
| 1 | LL4148 1N4148 | D_MiniMELF | D1 |
| 11 | 3V3 | D_MiniMELF | D2, D3, D4, D8, D9, D10, D11, D14 +3 |
| 2 | LESD5D5.0CT1G-MS | D_SOD-523 | D5, D6 |
| 1 | LL4148 | D_MiniMELF | D7 |
| 2 | 5V6 | D_MiniMELF | D12, D13 |
| 4 | 100n | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C4, C6 |
| 1 | 100u | CP_Radial_D4.0mm_P1.50mm | C3 |
| 1 | 22u/25V | CP_EIA-3528-21_Kemet-B | C5 |
| 1 | 10u/16V | CP_EIA-3528-21_Kemet-B | C7 |
| 1 | 22u | CP_Radial_D4.0mm_P1.50mm | C8 |
| 1 | 22u | CP_Radial_D5.0mm_P2.00mm | C9 |
| 2 | 100n | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | C10, C15 |
| 4 | 10u | CP_Radial_D5.0mm_P2.00mm | C11, C16, C17, C18 |
| 2 | 100n | C_0805_2012Metric | C12, C21 |
| 1 | 1n | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | C13 |
| 1 | 47u | CP_Radial_D5.0mm_P2.00mm | C14 |
| 2 | 10n | C_0805_2012Metric | C19, C20 |
| 21 | 10k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3, R6, R11, R16, R18, R21 +13 |
| 1 | 10K 10k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | 2k | C_0805_2012Metric | R5 |
| 9 | 4k7 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7, R8, R9, R24, R25, R51, R52, R63 +1 |
| 2 | 47k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10, R15 |
| 6 | 510R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R12, R14, R57, R59, R60, R62 |
| 3 | 120R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R13, R58, R61 |
| 5 | 2,5mR | R_2512_6332Metric | R17, R19, R20, R22, R23 |
| 4 | 100R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R26, R27, R29, R32 |
| 2 | 1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R28, R31 |
| 2 | 0R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R34, R37 |
| 1 | 1k8 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R35 |
| 2 | 7k8 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R39, R46 |
| 2 | 2k2 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R40, R47 |
| 3 | 220R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R43, R45, R50 |
| 2 | 2,4k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R55, R56 |
ESP32 master design files
The KiCad project lives in the kwiecinski/BMS-and-offgrid-photovoltaic-management-system repository on GitHub; these links point at the commit this page was built from.
ESP32 master: common questions
What microcontroller does the ESP32 master use?
The ESP32 master is built around the ESP32_DevKit_V1_DOIT, from the ESP32 family.
How big is the ESP32 master PCB?
The ESP32 master measures 99.5 × 99.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the ESP32 master?
153 components, from 69 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 ESP32 master design files?
From the kwiecinski/BMS-and-offgrid-photovoltaic-management-system 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 ESP32 master design in my own project?
Yes, under the terms of its MIT license, which kwiecinski chose for the repository.
Can I test firmware for the ESP32 master 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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