# Lovely Turquoise Lightcycle ## Description 4-Channel Secure 433 MHz Automotive Relay Receiver with STM32G071 and RFM69HCW, featuring a 16-pin Digi-Key right-angle ≥10 A/circuit connector, 2 oz copper 10 A traces, AEC-Q200 Digi-Key control passives, and verified LED/pushbutton wiring #automotive #433MHz #STM32G0 #RFM69 #relays #10A #2ozCopper #AECQ200 ## Project Details - **Owner:** krishneel-t - **Created:** 1/2/2026 - **Last Updated:** 1/5/2026 - **Visibility:** Public - **Operating Voltage:** 12V - **Connectivity:** 433MHz RF (RFM69HCW), WiFi, U.FL Antenna via J2 - **Domain:** Automotive - **TraceWidths:** 12V_10A: 5.0 mm (outer layer, 2oz), 3V3: 0.25 mm - **System Architecture:** Automotive 12V input → fuse F1 → ideal P-MOSFET reverse protection Q5 → ferrite bead FB1 → 12V distribution & relay coil rail → LT1763 3.3V LDO (U3) → STM32G071 MCU (U1) + RFM69HCW RF module (U2) handling 433 MHz comms → 4x relay drivers (Q1–Q4) → 4x Omron G5LE-1-E-DC12 relays (K1–K4) → Mini-Fit Jr connector J1 for I/O and power; channel configuration via DIP S1 and trimmers R1–R4; user interface via SW1 learn button and LEDs. - **NetClassifications:** RF: {SPI_MOSI, SPI_MISO, SPI_SCK, SPI_NSS, IRQ, U2:ANT, J2:Center_Contact}; Digital: {IRQ, SPI_MOSI, SPI_MISO, SPI_SCK, SPI_NSS, BOOT0, RST, MCU GPIOs for relays, DIP switches, trimmers, LEDs, learn button}; Power: {3.3V, 12V input rail between J1:13, F1, Q5, L1, relay coils, U3:IN, GND} - **Manufacturing Quantity Target:** 10 - **Reviews:** Updated ERC/DRC review results fetched via @review; no schematic changes requested in this step. - **Stackup:** 4-layer standard - **Power Requirements:** Battery ## Key Components ### D1 — [1N4007](https://www.flux.ai/adrian95/1n4007~3wg.md) - Part Type: Diode - Role Details: Flyback diode for relay coil K1 - Manufacturer Name: Yangjie Technology - Package: DO-41_BD2.4-L4.7-P8.70-D0.9-RD - Role: Flyback / Freewheeling - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1N4007 - Datasheet URL: https://diotec.com/tl_files/diotec/files/pdf/datasheets/1n4001.pdf **Pins:** - anode [pin 2] - cathode [pin 1] ### D2 — [1N4007](https://www.flux.ai/adrian95/1n4007~3wg.md) - Package: DO-41_BD2.4-L4.7-P8.70-D0.9-RD - Datasheet URL: https://diotec.com/tl_files/diotec/files/pdf/datasheets/1n4001.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 1N4007 - Manufacturer Name: Yangjie Technology - Part Type: Diode - Role: Flyback / Freewheeling - Role Details: Flyback diode for relay coil K2 **Pins:** - anode [pin 2] - cathode [pin 1] ### D3 — [1N4007](https://www.flux.ai/adrian95/1n4007~3wg.md) - Role Details: Flyback diode for relay coil K3 - Manufacturer Name: Yangjie Technology - Part Type: Diode - Role: Flyback / Freewheeling - Package: DO-41_BD2.4-L4.7-P8.70-D0.9-RD - Datasheet URL: https://diotec.com/tl_files/diotec/files/pdf/datasheets/1n4001.pdf - Manufacturer Part Number: 1N4007 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - anode [pin 2] - cathode [pin 1] ### D4 — [1N4007](https://www.flux.ai/adrian95/1n4007~3wg.md) - Package: DO-41_BD2.4-L4.7-P8.70-D0.9-RD - Manufacturer Name: Yangjie Technology - Part Type: Diode - Role Details: Flyback diode for relay coil K4 - Datasheet URL: https://diotec.com/tl_files/diotec/files/pdf/datasheets/1n4001.pdf - Manufacturer Part Number: 1N4007 - License: https://creativecommons.org/licenses/by/4.0/ - Role: Flyback / Freewheeling **Pins:** - anode [pin 2] - cathode [pin 1] ### D6 — [BZX84C15Q-7-F](https://www.flux.ai/lcsc/bzx84c15q-7-f~rmk.md) - Package: SOT-23 - Role Details: Zener clamp between Q5 Gate and Source - LCSC Part Number: C705320 - Role: Protection - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2007202036_Diodes-Incorporated-BZX84C15Q-7-F_C705320.pdf - Product Info Url: https://lcsc.com/product-detail/Zener-Diodes_Diodes-Incorporated-BZX84C15Q-7-F_C705320.html - Manufacturer Part Number: BZX84C15Q-7-F - Part Type: Zener Diodes - Package or Case Code: SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR - JLCPCB Part Class: Extended Part - Manufacturer Name: DIODES(美台) **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### DIP switch — [1825360-3](https://www.flux.ai/adrian95/1825360-3~qvc.md) - Manufacturer Name: TE Connectivity - Part Type: Switch - Role: Switching - Package or Case Code: DIP810W60P254L1209H480Q8N - Manufacturer Part Number: 1825360-3 - S1: ON=latch, OFF=momentary - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Select momentary or latching per channel - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=ADE_ADP_ADF_Datasheet&DocType=Data+Sheet&DocLang=English&DocFormat=pdf&PartCntxt=1825360-3 - Function: ON = latch, OFF = momentary **Pins:** - COM_1 [pin 1] - COM_2 [pin 2] - COM_3 [pin 3] - COM_4 [pin 4] - NO_1 [pin 5] - NO_2 [pin 6] - NO_3 [pin 7] - NO_4 [pin 8] ### FB1 — [BLM31KN121SH1L](https://www.flux.ai/adrian95/blm31kn121sh1l~s8i.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: BLM31KN121SH1L - Part Type: Filter - Datasheet URL: https://www.murata.com/en-us/products/productdata/8801529495582/QNFA9148.pdf - Manufacturer Name: Murata Electronics **Pins:** - 1 [pin 1] - 2 [pin 2] ### Fuse 10 — [3405.0169.24](https://www.flux.ai/lcsc/3405p0169p24~e8da.md) - Manufacturer Name: SCHURTER - Package or Case Code: FUSE-SMD_L6.1-W2.6 - Role Details: Input fuse for automotive power rail - Part Type: Automotive Fuses - Role: Protection - Manufacturer Part Number: 3405.0169.24 - LCSC Part Number: C1972559 - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] ### J1 — [0874271602](https://www.flux.ai/adrian95/0874271602~440.md) - Manufacturer Part Number: 87427-1602 - Part Type: Connector - Datasheet URL: https://www.molex.com/pdm_docs/sd/874270202_sd.pdf - Manufacturer Name: Molex - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: 87427-16YY_347202 **Pins:** - 1 [pin 1] - 10 [pin 10] - 11 [pin 11] - 12 [pin 12] - 13 [pin 13] - 14 [pin 14] - 15 [pin 15] - 16 [pin 16] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### J2 — [U.FL-R-SMT-1(10)](https://www.flux.ai/jecstronic/upfl-r-smt-110~du.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role: Connector - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Hirose%20PDFs/EDC3-302540-10.tif.pdf - Manufacturer Part Number: U.FL-R-SMT-1(10) - Manufacturer Name: Hirose Electric Co Ltd - Role Details: 433 MHz antenna connector **Pins:** - Center_Contact [pin 2] - Outer_Contact [pin 1] - Outer_Contact [pin 3] ### K1 — [G5LE-1-E DC12](https://www.flux.ai/jecstronic/g5le-1-e-dc12~7b3.md) - Role: Switching - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: G5LE-1-E DC12 - Part Type: Relay - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/2333/G5LE-E_G.pdf - Manufacturer Name: Omron Electronics Inc-EMC Div - Role Details: SPDT relay 12V coil for channel control **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### K2 — [G5LE-1-E DC12](https://www.flux.ai/jecstronic/g5le-1-e-dc12~7b3.md) - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/2333/G5LE-E_G.pdf - Manufacturer Name: Omron Electronics Inc-EMC Div - Role: Switching - Role Details: SPDT relay 12V coil for channel control - Part Type: Relay - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: G5LE-1-E DC12 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### K3 — [G5LE-1-E DC12](https://www.flux.ai/jecstronic/g5le-1-e-dc12~7b3.md) - Part Type: Relay - Role Details: SPDT relay 12V coil for channel control - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: G5LE-1-E DC12 - Manufacturer Name: Omron Electronics Inc-EMC Div - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/2333/G5LE-E_G.pdf - Role: Switching **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### K4 — [G5LE-1-E DC12](https://www.flux.ai/jecstronic/g5le-1-e-dc12~7b3.md) - Manufacturer Name: Omron Electronics Inc-EMC Div - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/2333/G5LE-E_G.pdf - Role: Switching - Role Details: SPDT relay 12V coil for channel control - Part Type: Relay - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: G5LE-1-E DC12 **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] ### LED1 — [WP710A10ID5V](https://www.flux.ai/adrian95/wp710a10id5v~ugr.md) - Role Details: Status LED for pairing/lock indication - Manufacturer Name: Kingbright - Role: Indicator - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: WP710A10ID5V - Part Type: LED - Datasheet URL: https://www.kingbrightusa.com/images/catalog/SPEC/WP710A10ID5V.pdf **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [WP710A10ID5V](https://www.flux.ai/adrian95/wp710a10id5v~ugr.md) - Role: Indicator - Manufacturer Name: Kingbright - Role Details: Status LED for pairing/lock indication - Datasheet URL: https://www.kingbrightusa.com/images/catalog/SPEC/WP710A10ID5V.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Manufacturer Part Number: WP710A10ID5V **Pins:** - A [pin 2] - K [pin 1] ### Q1 — [2N3904](https://www.flux.ai/adrian95/2n3904~a6d.md) - Role Details: Low-side driver for relay coils - Role: Switching - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Manufacturer Name: NTE Electronics, Inc - Manufacturer Part Number: 2N3904 - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q2 — [2N3904](https://www.flux.ai/adrian95/2n3904~a6d.md) - Role: Switching - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf - Manufacturer Name: NTE Electronics, Inc - Manufacturer Part Number: 2N3904 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Role Details: Low-side driver for relay coils **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q3 — [2N3904](https://www.flux.ai/adrian95/2n3904~a6d.md) - Manufacturer Part Number: 2N3904 - Role: Switching - Manufacturer Name: NTE Electronics, Inc - Role Details: Low-side driver for relay coils - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q4 — [2N3904](https://www.flux.ai/adrian95/2n3904~a6d.md) - Role: Switching - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Transistor - Manufacturer Name: NTE Electronics, Inc - Manufacturer Part Number: 2N3904 - Role Details: Low-side driver for relay coils - Datasheet URL: https://www.nteinc.com/specs/original/2N3904.pdf **Pins:** - B [pin 2] - C [pin 3] - E [pin 1] ### Q5 — [DMP3013SFV-7](https://www.flux.ai/jecstronic/dmp3013sfv-7~kga.md) - Drain to Source Voltage: 30V - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: DMP3013SFV-7 - Transistor Type: MOSFET - Part Type: Transistor - Datasheet URL: https://www.diodes.com/assets/Datasheets/DMP3013SFV.pdf - Role: Protection - Role Details: Reverse polarity protection MOSFET on input stage - Continuous Drain Current: 5.8A - Manufacturer Name: Diodes Incorporated **Pins:** - D [pin 5] - D [pin 8] - D [pin 7] - D [pin 6] - G [pin 4] - S [pin 3] - S [pin 2] - S [pin 1] ### SW1 — [3-1825910-5](https://www.flux.ai/vasy_skral/3-1825910-5~1i0.md) - Part Type: Switch - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: TE Connectivity ALCOSWITCH Switches - Role Details: Learn button for rolling code pairing - Role: User Interface - Manufacturer Part Number: 3-1825910-5 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1825910&DocType=Customer+Drawing&DocLang=English **Pins:** - 1-1 [pin 1-1] - 1-2 [pin 1-2] - 2-1 [pin 2-1] - 2-2 [pin 2-2] ### U1 — [STM32G071KBT6](https://www.flux.ai/vasy_skral/stm32g071kbt6~71x.md) - Role: Main MCU - Datasheet URL: https://www.st.com/resource/en/datasheet/stm32g071cb.pdf - Manufacturer Name: STMicroelectronics - Part Type: Microcontroller - Manufacturer Part Number: STM32G071KBT6 **Pins:** - ~RST~/PF2 [pin 6] - OSC32_IN/PC14 [pin 2] - OSC32_OUT/PC15 [pin 3] - PA0 [pin 7] - PA1 [pin 8] - PA10 [pin 21] - PA11_[PA9] [pin 22] - PA12_[PA10] [pin 23] - PA13 [pin 24] - PA14/BOOT0 [pin 25] - PA15 [pin 26] - PA2 [pin 9] - PA3 [pin 10] - PA4 [pin 11] - PA5 [pin 12] - PA6 [pin 13] - PA7 [pin 14] - PA8 [pin 18] - PA9 [pin 19] - PB0 [pin 15] - PB1 [pin 16] - PB2 [pin 17] - PB3 [pin 27] - PB4 [pin 28] - PB5 [pin 29] - PB6 [pin 30] - PB7 [pin 31] - PB8 [pin 32] - PB9 [pin 1] - PC6 [pin 20] - VDD/VDDA [pin 4] - VSS/VSSA [pin 5] ### U2 — [RFM69HCW](https://www.flux.ai/vasyl/rfm69hcw~52w.md) - Datasheet URL: https://www.hoperf.com/data/upload/portal/20181127/5bfcb8284d838.pdf - Role: RF Transceiver - Manufacturer Name: Hoperf letrnc - Part Type: RF module - Package or Case Code: MOD_COM-13909 - Manufacturer Part Number: RFM69HCW **Pins:** - 3.3V [pin 13] - ANT [pin 9] - DIO0 [pin 14] - DIO1 [pin 15] - DIO2 [pin 16] - DIO3 [pin 11] - DIO4 [pin 12] - DIO5 [pin 7] - GND [pin 8] - GND [pin 10] - GND [pin 1] - MISO [pin 2] - MOSI [pin 3] - NSS [pin 5] - RESET [pin 6] - SCK [pin 4] ### U3 — [LT1763](https://www.flux.ai/mr-bammby/lt1763~63.md) - Datasheet URL: https://eu.mouser.com/datasheet/2/609/1763fh-3123364.pdf - Role: Power Conversion - Integrated Circuit Type: Power Management - Manufacturer Name: Analog Devices - Current Rating: 0.5A - Role Details: 3.3 V LDO regulator for MCU and RF sections - Manufacturer Part Number: LT1763CS8-3.3#PBF - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - BYP [pin 4] - GND [pin 3] - GND [pin 7] - GND [pin 6] - IN [pin 8] - nSHDN [pin 5] - OUT [pin 1] - SENSE/ADJ [pin 2] ### VR1 — [TC33X-2-103E](https://www.flux.ai/jecstronic/tc33x-2-103e~7n.md) - Part Type: Potentiometer - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: TC33X-2-103E - Datasheet URL: https://www.bourns.com/docs/Product-Datasheets/TC33.pdf - Manufacturer Name: Bourns Inc. - Resistance: 10kΩ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### VR2 — [TC33X-2-103E](https://www.flux.ai/jecstronic/tc33x-2-103e~7n.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: TC33X-2-103E - Part Type: Potentiometer - Resistance: 10kΩ - Datasheet URL: https://www.bourns.com/docs/Product-Datasheets/TC33.pdf - Manufacturer Name: Bourns Inc. **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### VR3 — [TC33X-2-103E](https://www.flux.ai/jecstronic/tc33x-2-103e~7n.md) - Datasheet URL: https://www.bourns.com/docs/Product-Datasheets/TC33.pdf - Manufacturer Name: Bourns Inc. - Resistance: 10kΩ - Part Type: Potentiometer - Manufacturer Part Number: TC33X-2-103E - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] ### VR4 — [TC33X-2-103E](https://www.flux.ai/jecstronic/tc33x-2-103e~7n.md) - Manufacturer Part Number: TC33X-2-103E - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Potentiometer - Resistance: 10kΩ - Datasheet URL: https://www.bourns.com/docs/Product-Datasheets/TC33.pdf - Manufacturer Name: Bourns Inc. **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/krishneel-t/lovely-turquoise-lightcycle~s6](https://www.flux.ai/krishneel-t/lovely-turquoise-lightcycle~s6).* --- *Generated from [https://www.flux.ai/krishneel-t/lovely-turquoise-lightcycle~s6](https://www.flux.ai/krishneel-t/lovely-turquoise-lightcycle~s6)*