Chronofit
About the Chronofit PCB
Chronofit is an open source ESP32 PCB design by inox85, published on GitHub. It is a 4-layer board measuring 51.7 × 98 mm, with 96 components from 53 distinct parts.
Its main chip is the ESP32-WROOM-32(8MB), from the ESP32 family. Other key parts include the ATGM336H, CP2102-GMR, AO3400_C5224189, LM2596M-ADJ/TR and BAS70-05_C7461133. By type, the board carries 31 resistors, 20 capacitors, 15 ICs, 7 LEDs, 7 diodes and 2 transistors.
It belongs with the rf & radio designs in this gallery.
Main components on the Chronofit
Chronofit bill of materials (BOM)
96 components, 53 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATGM336H | ATGM336H | U1 |
| 1 | CP2102-GMR | WQFN-28_L5.0-W5.0-P0.50-BL-EP3.2 | U2 |
| 1 | AO3400_C5224189 | SOT-23-3_L2.9-W1.3-P0.95-LS2.4-BR | U3 |
| 1 | ESP32-WROOM-32(8MB) | WIFIM-SMD_39P-L25.5-W18.0-P1.27 | U4 |
| 1 | LM2596M-ADJ/TR | SOP-8_L4.9-W3.9-P1.27-LS6.0-BL | U5 |
| 1 | BAS70-05_C7461133 | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | U6 |
| 1 | 1000uF | CAP-SMD_BD10.0-L10.3-W10.3-LS11.3-FD | U7 |
| 1 | TD6817H | SOT-23-5_L2.9-W1.6-P0.95-LS2.8-BR | U9 |
| 1 | LORA RA-01 SX1278 | LORA RA-01 SX1278 | U10 |
| 1 | HC-PM254-5.0H-1X6PZ | HDR-TH_HC-PM254-5.0H-1X6PZ | U12 |
| 5 | NRVB130T1G_C917121 | SOD-123_L2.7-W1.6-LS3.7-RD-1 | U13, U14, U15, U16, U17 |
| 2 | S8050H 200-350 | SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | Q1, Q4 |
| 1 | B5B-XH-A-BK(LF)(SN) | CONN-TH_B5B-XH-A-BK-LF-SN | CN1 |
| 1 | 2700Hz | BUZ-TH_BD9.0-P4.00-D0.6-FD | BUZZER3 |
| 1 | DC-005-A200 | DC-IN-TH_DC-005-A200 | DC1 |
| 1 | MINISMDC110F-2 | F1812 | F1 |
| 1 | Hole_gge181386 | Hole_gge181386 | Hole_gge181386 |
| 1 | Hole_gge189325 | Hole_gge189325 | Hole_gge189325 |
| 1 | Hole_gge196727 | Hole_gge196727 | Hole_gge196727 |
| 1 | Hole_gge200780 | Hole_gge200780 | Hole_gge200780 |
Show 33 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | TS3315A | SW-SMD_4P-L3.4-W3.4-P2.00-LS4.0_TS3315A160GF | SW1, SW3 |
| 2 | TYPE-C 16PIN 2MD(073) | USB-C-SMD_TYPE-C-6PIN-2MD-073 | USB1, USB2 |
| 1 | BLUE_LED | LED-SMD_L1.7-W1.1-R-RD_GREEN | LED1 |
| 1 | RED_LED | LED-SMD_L1.7-W1.1-R-RD_GREEN | LED2 |
| 1 | GREEN_LED | LED-SMD_L1.7-W1.1-R-RD_GREEN | LED3 |
| 1 | ORANGE_LED | LED-SMD_L1.7-W1.1-R-RD_GREEN | LED4 |
| 1 | SK6812SIDE-A_C5378721 | LED-SMD_4P-L4.0-W1.6-L | LED5 |
| 2 | 19-213/Y2C-CQ2R2L/3T(CY) | LED0603-R-RD | RX1, TX1 |
| 1 | USBLC6-2P6_C49451919 | SOT-563_L1.6-W1.2-P0.50-LS1.6-BL | D1 |
| 1 | SS34_C8678 | SMA_L4.3-W2.6-LS5.2-RD | D8 |
| 3 | SS36_C7420367 | SMA_L4.3-W2.6-LS5.0-FD | D9, D10, D14 |
| 2 | BAW56_C545543 | SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | D12, D13 |
| 1 | 2.2uH | IND-SMD_L5.2-W5.1 | L3 |
| 1 | 33uH | IND-SMD_L7.1-W6.6 | L4 |
| 3 | 22uF | C0805 | C3, C5, C24 |
| 6 | 100nF | C0402 | C4, C8, C14, C18, C21, C22 |
| 2 | 47uF | C1210 | C6, C7 |
| 3 | 1uF | C0402 | C9, C10, C15 |
| 1 | 47uF | C1206 | C13 |
| 1 | 100uF | CAP-SMD_BD6.3-L6.6-W6.6-LS7.6-FD | C17 |
| 2 | 470uF | CAP-SMD_BD6.3-L6.6-W6.6-LS7.6-RD | C23, C27 |
| 2 | 10nF | C0402 | C25, C26 |
| 11 | 10kΩ | R0402 | R1, R2, R3, R7, R19, R24, R25, R26 +3 |
| 4 | 330Ω | R0402 | R4, R5, R9, R32 |
| 1 | 12K | R0603 | R12 |
| 1 | 3K | R0603 | R14 |
| 3 | 560Ω | R0402 | R15, R16, R37 |
| 4 | 5.1kΩ | R0402 | R18, R20, R43, R44 |
| 1 | 100kΩ | R0402 | R31 |
| 3 | 1kΩ | R0402 | R36, R39, R42 |
| 1 | 20k | R0402 | R38 |
| 1 | 3kΩ | R0402 | R41 |
| 1 | 5760 | R0402 | R45 |
Chronofit design files
The KiCad project lives in the inox85/chronofit repository on GitHub; these links point at the commit this page was built from.
Chronofit: common questions
What microcontroller does the Chronofit use?
The Chronofit is built around the ESP32-WROOM-32(8MB), from the ESP32 family.
How big is the Chronofit PCB?
The Chronofit measures 51.7 × 98 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Chronofit?
96 components, from 53 distinct parts. The full bill of materials is listed on this page.
Where can I download the Chronofit design files?
From the inox85/chronofit repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Chronofit design in my own project?
The repository has no license, so all rights stay with inox85. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Chronofit 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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