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2.The process supports design scales of 300 devices or 1000 pads

3.Supports simple circuit simulation

4.For students, teachers, creators

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STD ELM-327

License: GPL 3.0

Mode: Editors' pick

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Update time: 2024-02-14 04:42:24
Creation time: 2024-02-07 00:16:26
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
schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 100nf C1 CERAMIC-5.08 1
2 2.2uF C2,C4 CAP-TH_BD5.0-P2.00-D0.8-FD 2
3 100nF C3,C5,C8,C9,C10 CERAMIC-5.08 5
4 27pF C6,C7 CERAMIC-5.08 2
5 Serial CN1 HDR-1X4 / 2.54 1
6 DB9F CON1 DB9-TH_DB9F_C9900018961 1
7 1N4148FL D1,D2,D3 1N4148 3
8 HDR1X4 ICSP HDR-1X6 / 2.54 1
9 term J1 HDR-TH_2P-P2.54-V-M-1 1
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
13 BC557B Q2,Q4 TO-92-3_L4.8-W3.7-P2.54-L 2
14 47k R1,R9 RESISTOR D2.5-L7-0.25W 2 Resistor
15 6k2 R2,R3 RESISTOR D2.5-L7-0.25W 2 Resistor
16 330R R4,R5,R6 RESISTOR D2.5-L7-0.25W 3 Resistor
17 2K2 R7,R11 RESISTOR D2.5-L7-0.25W 2 Resistor
18 510R R8,R12 RESISTOR D2.5-L7-0.25W 2 Resistor
19 18K R10 RESISTOR D2.5-L7-0.25W 1 Resistor
20 4k7 R13,R15,R16,R21,R23 RESISTOR D2.5-L7-0.25W 5 Resistor
21 10k R14,R17,R18,R19,R20,R22 RESISTOR D2.5-L7-0.25W 6 Resistor
22 120R R24 RESISTOR D2.5-L7-0.25W 1 Resistor
23 Shld Gnd SJ1 SJ_2S 1
24 PIC18F25K80-ESP U1 DIP28 1 Enhanced Flash Microcontroller with ECAN(TM) and nanoWatt XLP Technology, 64 MHz, 24 IO, -40 to 125 degC, 28-pin SPDIP (SP28), Tube
25 MCP2562-E/P U2 PDIP-8_L9.3-W6.4-P2.54-LS7.6-BL 1
26 KA78L05AAZTA VR1,VR3 TO-92-3_L4.8-W3.7-P2.54-L 2
27 AP7384-28V-A VR2 TO-92-3_L4.8-W3.7-P2.54-L 1
28 4mhz X1 HC49U-V 1

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p25k80.hex

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