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STD ELM-327
ELM-327
License
GPL 3.0
License: GPL 3.0Mode:
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Update time：
2024-10-12 07:16:55
Creation time：
2024-02-07 00:16:26
Description
Description
If you are working with cars and trying to diagnose it, at some point you will need to interface onboard computer into computer.
Here we offer an OBD-II to serial emulator. It provides simple serial TTL level voltages that you will need to connect to some sort of converter to interface it into RS232, USB or Bluetooth
PCB layout with DB9 will require cable with DB9 to vehicle's OBD-II J1962 connector. or alternative layout with male OBD connector.
For more information, refer to: http://PCBhut.com/Products/ELM327/index.html
Design Drawing
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity | |
|---|---|---|---|---|---|
| 1 | 100nf | C1 | CERAMIC-5.08 | 1 | C62912 |
| 2 | 2.2uF | C2,C4 | CAP-TH_BD5.0-P2.00-D0.8-FD | 2 | C78759 |
| 3 | 100nF | C3,C5,C8,C9,C10 | CERAMIC-5.08 | 5 | C1821 |
| 4 | 27pF | C6,C7 | CERAMIC-5.08 | 2 | C327061 |
| 5 | Serial | CN1 | HDR-1X4 / 2.54 | 1 | C492605 |
| 6 | DB9F | CON1 | DB9-TH_DB9F_C9900018961 | 1 | C9900018961 |
| 7 | 1N4148FL | D1,D2,D3 | 1N4148 | 3 | C2874197 |
| 8 | HDR1X4 | ICSP | HDR-1X6 / 2.54 | 1 | C9900027556 |
| 9 | term | J1 | HDR-TH_2P-P2.54-V-M-1 | 1 | NONE |
| 10 | LED_5MM | LED1,LED2,LED3 | LED-5MM-5MM | 3 | |
| 11 | M08X2-OBDII-COMTECH | OBDII | OBDII-COMTECH | 1 | |
| 12 | BC547B A1G | Q1,Q3,Q5,Q6,Q7 | TO-92-3_L4.8-W3.7-P2.54-L | 5 | C486021 |
| 13 | BC557B | Q2,Q4 | TO-92-3_L4.8-W3.7-P2.54-L | 2 | C2093 |
| 14 | 47k | R1,R9 | RESISTOR D2.5-L7-0.25W | 2 | |
| 15 | 6k2 | R2,R3 | RESISTOR D2.5-L7-0.25W | 2 | |
| 16 | 330R | R4,R5,R6 | RESISTOR D2.5-L7-0.25W | 3 | |
| 17 | 2K2 | R7,R11 | RESISTOR D2.5-L7-0.25W | 2 | |
| 18 | 510R | R8,R12 | RESISTOR D2.5-L7-0.25W | 2 | |
| 19 | 18K | R10 | RESISTOR D2.5-L7-0.25W | 1 | |
| 20 | 4k7 | R13,R15,R16,R21,R23 | RESISTOR D2.5-L7-0.25W | 5 | |
| 21 | 10k | R14,R17,R18,R19,R20,R22 | RESISTOR D2.5-L7-0.25W | 6 | |
| 22 | 120R | R24 | RESISTOR D2.5-L7-0.25W | 1 | |
| 23 | Shld Gnd | SJ1 | SJ_2S | 1 | |
| 24 | PIC18F25K80-ESP | U1 | DIP28 | 1 | |
| 25 | MCP2562-E/P | U2 | PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL | 1 | C640345 |
| 26 | NUP2105LT3 | U3 | SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR | 1 | C9900085745 |
| 27 | KA78L05AAZTA | VR1,VR3 | TO-92-3_L4.8-W3.7-P2.54-L | 2 | C3746588 |
| 28 | AP7384-28V-A | VR2 | TO-92-3_L4.8-W3.7-P2.54-L | 1 | C3752375 |
| 29 | 4mhz | X1 | HC49U-V | 1 |
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