Lfp
About the Lfp PCB
Lfp is an open source ESP32 PCB design by maxakash, published on GitHub. It is a 2-layer board measuring 216 × 146 mm, with 831 components from 74 distinct parts.
Its main chip is the ESP32-C3-WROOM-02-N4, from the ESP32 family. Other key parts include the AMS1117-3.3, CJ431, LM358DR2G, LM393DR2G and ADS1115IDGSR. By type, the board carries 475 resistors, 125 capacitors, 96 transistors, 88 diodes, 24 ICs and 12 connectors.
It belongs with the iot & wireless designs in this gallery.
From the project
An open hardware tester for LiFePO4 32140/33140 cells. One LFP-8 board handles 8 cells. Five boards, JLCPCB's minimum order, test 40 cells at once. Each channel can
An open hardware tester for LiFePO4 32140/33140 cells. One LFP-8 board handles 8 cells. Five boards, JLCPCB's minimum order, test 40 cells at once. Each channel can
charge with constant current then constant voltage: ≈ 1.0 A, CV 3.58 V, hardware OV latch at 3.82 V discharge at ≈ 1.07 A, with a hardware under-voltage backstop at 2.22 V measure capacity (coulomb counting, mAh/mWh) and internal resistance (pulse method, Rohmic at 10 ms and DC-IR at 1 s) through true 4-wire Kelvin connections read a 10 k NTC** on every cell
Main components on the Lfp
Lfp bill of materials (BOM)
831 components, 74 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AMS1117-3.3 | SOT-223-3_TabPin2 | U1 |
| 1 | CJ431 CJ431 2.495V | SOT-23 | U2 |
| 1 | LM358DR2G LM358 | SOIC-8_3.9x4.9mm_P1.27mm | U3 |
| 2 | LM393DR2G LM393 | SOIC-8_3.9x4.9mm_P1.27mm | U4, U5 |
| 1 | ESP32-C3-WROOM-02-N4 | ESP32-C3-WROOM-02 | U6 |
| 1 | ADS1115IDGSR ADS1115 | TSSOP-10_3x3mm_P0.5mm | U7 |
| 5 | CD4051BM96 CD4051B | SOIC-16_3.9x9.9mm_P1.27mm | U8, U9, U10, U11, U12 |
| 4 | 74HC595D,118 74HC595 | SOIC-16_3.9x9.9mm_P1.27mm | U13, U14, U15, U16 |
| 8 | LM324DT LM324 | SOIC-14_3.9x8.7mm_P1.27mm | U101, U201, U301, U401, U501, U601, U701, U801 |
| 33 | MMBT3904 | SOT-23 | Q7, Q102, Q106, Q110, Q111, Q202, Q206, Q210 +25 |
| 9 | 2N7002 | SOT-23 | Q8, Q103, Q203, Q303, Q403, Q503, Q603, Q703 +1 |
| 5 | BSS138 | SOT-23 | Q9, Q10, Q11, Q12, Q13 |
| 25 | AO3400A | SOT-23 | Q14, Q104, Q105, Q108, Q204, Q205, Q208, Q304 +17 |
| 8 | AO3401A | SOT-23 | Q101, Q201, Q301, Q401, Q501, Q601, Q701, Q801 |
| 16 | MMBT3906 | SOT-23 | Q107, Q109, Q207, Q209, Q307, Q309, Q407, Q409 +8 |
| 1 | KF301-5.0-2P / 2-pin 5.08 mm 16 A terminal PWR 5V | TerminalBlock_bornier-2_P5.08mm | J1 |
| 1 | 2.54 mm header FAN 5V | PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | 2.54 mm header USB/PROG | PinHeader_1x06_P2.54mm_Vertical | J3 |
| 1 | 2.54 mm header AUX | PinHeader_1x06_P2.54mm_Vertical | J4 |
| 8 | JST B6B-XH-A (or clone) XH-6P | JST_XH_B6B-XH-A_1x06_P2.50mm_Vertical | J101, J201, J301, J401, J501, J601, J701, J801 |
Show 54 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 8 | 1812L200/30GR PTC 2A | Fuse_1812_4532Metric | F101, F201, F301, F401, F501, F601, F701, F801 |
| 1 | TS-1088 type 5.1x5.1 E-STOP | SW_SMD_5.1x5.1_4P | SW1 |
| 1 | TS-1088 type 5.1x5.1 RESET | SW_SMD_5.1x5.1_4P | SW2 |
| 1 | TS-1088 type 5.1x5.1 BOOT | SW_SMD_5.1x5.1_4P | SW3 |
| 1 | SMBJ6.0A | D_SMB | D1 |
| 1 | SS54 | D_SMA | D2 |
| 66 | BAT54WS | D_SOD-323 | D7, D8, D102, D103, D104, D105, D107, D108 +58 |
| 1 | 0805 green SAFE | LED_0805_2012Metric | D9 |
| 1 | 0603 red PWR | LED_0603_1608Metric | D10 |
| 2 | SS14 | D_SMA | D11, D12 |
| 8 | SS34 | D_SMA | D101, D201, D301, D401, D501, D601, D701, D801 |
| 8 | 0805 green Green | LED_0805_2012Metric | D106, D206, D306, D406, D506, D606, D706, D806 |
| 2 | 100u | C_1206_3216Metric | C1, C2 |
| 2 | 22u | C_1206_3216Metric | C3, C4 |
| 3 | 22u | C_0805_2012Metric | C5, C6, C19 |
| 29 | 100n | C_0603_1608Metric | C7, C10, C11, C12, C13, C14, C16, C17 +21 |
| 1 | 10u | C_0805_2012Metric | C8 |
| 1 | 470n | C_0603_1608Metric | C15 |
| 17 | 1u | C_0603_1608Metric | C21, C103, C107, C203, C207, C303, C307, C403 +9 |
| 46 | 10n | C_0603_1608Metric | C24, C26, C28, C30, C32, C33, C101, C102 +38 |
| 16 | 47n | C_0603_1608Metric | C105, C110, C205, C210, C305, C310, C405, C410 +8 |
| 8 | 1n | C_0603_1608Metric | C109, C209, C309, C409, C509, C609, C709, C809 |
| 58 | 1k | R_0603_1608Metric | R1, R21, R105, R114, R135, R136, R137, R138 +50 |
| 46 | 10k | R_0603_1608Metric | R4, R9, R12, R14, R17, R20, R25, R26 +38 |
| 1 | 20k | R_0603_1608Metric | R5 |
| 1 | 40.2k | R_0603_1608Metric | R6 |
| 1 | 4.3k | R_0603_1608Metric | R7 |
| 86 | 100k | R_0603_1608Metric | R8, R29, R31, R32, R33, R45, R108, R109 +78 |
| 1 | 9.1k | R_0603_1608Metric | R10 |
| 1 | 8.2k | R_0603_1608Metric | R11 |
| 1 | 12k | R_0603_1608Metric | R13 |
| 42 | 47k | R_0603_1608Metric | R15, R30, R115, R134, R141, R151, R152, R215 +34 |
| 1 | 39k | R_0603_1608Metric | R16 |
| 13 | 4.7k | R_0603_1608Metric | R18, R34, R35, R36, R37, R104, R204, R304 +5 |
| 9 | 22k | R_0603_1608Metric | R22, R153, R253, R353, R453, R553, R653, R753 +1 |
| 17 | 33k | R_0603_1608Metric | R23, R129, R142, R229, R242, R329, R342, R429 +9 |
| 1 | 2.2k | R_0603_1608Metric | R24 |
| 19 | 1M | R_0603_1608Metric | R27, R28, R46, R121, R149, R221, R249, R321 +11 |
| 25 | 100 | R_0603_1608Metric | R44, R101, R102, R122, R201, R202, R222, R301 +17 |
| 8 | FRP2512F1R20TS 1.2R 2W | R_2512_6332Metric | R106, R206, R306, R406, R506, R606, R706, R806 |
| 8 | 49.9k | R_0603_1608Metric | R113, R213, R313, R413, R513, R613, R713, R813 |
| 8 | 30k | R_0603_1608Metric | R116, R216, R316, R416, R516, R616, R716, R816 |
| 8 | 75k | R_0603_1608Metric | R119, R219, R319, R419, R519, R619, R719, R819 |
| 8 | 36k | R_0603_1608Metric | R120, R220, R320, R420, R520, R620, R720, R820 |
| 32 | FRP2512F11R0TS 11R 2W | R_2512_6332Metric | R124, R125, R126, R127, R224, R225, R226, R227 +24 |
| 16 | 68k | R_0603_1608Metric | R128, R147, R228, R247, R328, R347, R428, R447 +8 |
| 8 | 62k | R_0603_1608Metric | R130, R230, R330, R430, R530, R630, R730, R830 |
| 8 | 240k | R_0603_1608Metric | R131, R231, R331, R431, R531, R631, R731, R831 |
| 8 | 150k | R_0603_1608Metric | R133, R233, R333, R433, R533, R633, R733, R833 |
| 8 | 360k | R_0603_1608Metric | R143, R243, R343, R443, R543, R643, R743, R843 |
| 8 | 27k | R_0603_1608Metric | R145, R245, R345, R445, R545, R645, R745, R845 |
| 8 | 200k | R_0603_1608Metric | R146, R246, R346, R446, R546, R646, R746, R846 |
| 8 | FRM252WFR100TN 0.1R 1% 50ppm | R_2512_Kelvin | R150, R250, R350, R450, R550, R650, R750, R850 |
| 8 | 91k | R_0603_1608Metric | R155, R255, R355, R455, R555, R655, R755, R855 |
Lfp design files
The KiCad project lives in the maxakash/lfppcb repository on GitHub; these links point at the commit this page was built from.
- Layouthardware/kicad/lfp8.kicad_pcb
- Schematichardware/kicad/lfp8.kicad_sch
Lfp: common questions
What microcontroller does the Lfp use?
The Lfp is built around the ESP32-C3-WROOM-02-N4, from the ESP32 family.
How big is the Lfp PCB?
The Lfp measures 216 × 146 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Lfp?
831 components, from 74 distinct parts. The full bill of materials is listed on this page.
Where can I download the Lfp design files?
From the maxakash/lfppcb repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Lfp design in my own project?
The repository has no license, so all rights stay with maxakash. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Lfp 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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