ansemjo/luftctl10small esp32-c3 based pwm fan controller which powers from usb
Luftctl is an open-source printed circuit board by ansemjo, from the ansemjo/luftctl repository on GitHub. It is a 2-layer board of 56.6 × 25 mm with 41 parts on 30 nets, routed with 213 tracks and 24 vias.
It is built around the ESP32-C3-WROOM-02-H4, LMR62014XMF and MIC5504-3.3YM5, with the USBLC6-4SC6 among its other parts. Its parts include 10 capacitors, 10 resistors, 5 connectors, 4 ICs and 3 diodes. It belongs with the ESP32 and RISC-V boards of this library.
Small ESP32-C3 controller board to power two 12V PWM fans from a single USB-C plug.
Schematic and PCB design can be found in hardware/. It is a KiCAD 6 project.
The schematic is available as a PDF.
For hand-soldering, you can use the interactive BOM viewer.
The first simple test just loops through {5V/off, 5V/on, 12V/off, 12V/on} with every button press.
Download MicroPython from micropython.org/download/esp32c3-usb/ and flash it with:
esptool.py --chip esp32c3 --port /dev/ttyACM0 erase_flash
esptool.py --chip esp32c3 --port /dev/ttyACM0 --baud 460800 write_flash -z 0x0 esp32c3-*.binThen install a virtualenv with adafruit-ampy and upload the main.py:
ampy -p /dev/ttyACM0 put main.py
ampy -p /dev/ttyACM0 reset --hardThe red LED will blink upon every state change.
Since the ESP32-C3 is easily supported by ESPHome, you can also add it in your HomeAssistant automation using the provided example YAML.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 10kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R6, R7, R8 |
| 4 | Test | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP1, TP2, TP3, TP4 |
| 3 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C5, C9, C11 |
| 2 | 10µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C8, C10 |
| 2 | 1µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C4 |
| 2 | 4.7µF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C7 |
| 2 | 5.1kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R5 |
| 2 | PWM Fan | Connector:FanPinHeader_1x04_P2.54mm_Vertical | J4, J5 |
| 1 | 10µH | Inductor_SMD:L_Bourns_SRN6045TA | L1 |
| 1 | 113kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 13kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | 1N5819 | Diode_SMD:D_SOD-123 | D1 |
| 1 | 2.2kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10 |
| 1 | 220pF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C6 |
| 1 | 220ΩZ | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | FB1 |
| 1 | 660Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9 |
| 1 | Bootloader | Button_Switch_SMD:SW_SPST_PTS810 | JP1 |
| 1 | ESP32-C3-WROOM-02 | RF_Module:ESP-WROOM-02 | U4 |
| 1 | G*** | kibuzzard-61E47F36 | kibuzzard-61E47F36 |
| 1 | I2C | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J3 |
| 1 | LMR62014XMF | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | MIC5504-3.3YM5 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | PWR | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3 |
| 1 | Reset | Button_Switch_SMD:SW_SPST_PTS810 | SW1 |
| 1 | UART | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J2 |
| 1 | USBLC6-4SC6 | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | USB_C_Receptacle_USB2.0 | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
| 1 | USR | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D2 |
It measures 56.6 × 25 mm and has 2 copper layers, 1.6 mm thick.
41 parts, built around the ESP32-C3-WROOM-02-H4, LMR62014XMF, MIC5504-3.3YM5 and USBLC6-4SC6. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the ansemjo/luftctl repository on GitHub, at the commit this page was made from: the board is hardware/luftctl.kicad_pcb and its schematic hardware/luftctl.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask ansemjo before reusing the design.
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