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STD ELM-327

ELM-327

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License

GPL 3.0

License: GPL 3.0

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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
1 /
PCB
1 /
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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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p25k80.hex

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