Difference between revisions of "Car"
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Latest revision as of 16:51, 11 September 2015
Contents
Definition
Block Diagram
Boards
- Four Boards
- Car-Computer
- Car-Calls
- Car-Calls-Expander
- Car-isolator
Components
- SMD
- Leds,
- resistors
- small capacitors
- Conventional
- Relays
- Connectors
- Power Driver ICs
- Power PSU ICs
Car-Computer
- ~ 210 x 135 mm
- CPU ST8 48-LQFP
- Upper side of board free of connectors
- Clamp-connectors to other 3 sides
- About 70 connector pins
- VIN to 12V / 5A SMPS
- Connector to supply 12V from external stabilized PSU
- In this case SMPS parts are not assembled to PCB
Car Calls
- ~ 100 x 200 mm
- CPU ST8 48-LQFP
- Connectors on the 2 long sides
- SPI 8-bit power drivers
Car Calls Expander
- ~ 100 x 180 mm
- No CPU, SPI controlled
- Connectors on the 2 long sides
- SPI 8-bit power drivers
Car Isolator
- ~ 70 x 70 mm
- RS485 line opto-isolation
Work to do
CAD
- Existing Preliminary Schematics
- Schematic
- Transfer to other CAD
- Check existing circuitry
- Switching PSU
- XTAL,
- In-circuit programing connector
- Connector compatibility with V07
- Minor changes
- Update Components Packages
- Update 3D models
- PCB
- Transfer from Schematic
- Create PCB
- Gerber Files
- Inspect
- Document
- Pack all for pcb-manufacturer
PCB Manufacturing
- Order control
- Handle errors in data
- Handle Payment
- Receive PCBs
Part list Management
- Create part lists from CAD
- Create Purchase List
- Multiply with number of each board
- Unify lists of all boards to one
- Add data
- Manufacturer
- vendors
- Prices
- Lead times
- Exclude Available stock (...Relays, Clamp-connectors...)
- Order
- Control Vendor(s)
- Concentrate parts than are already available
- Relays
- Clamp-Connectors
- Other
- Wait and control order completion
Assembly
- Split parts for each board
- Assemble SMD
- Electric tests on CPU and other dense SMD ICs
- Sort circuits
- Circuit brakes
- Assemble Through-hole parts
Test
- Write test Code
- for ST08
- Car Computer
- Calls computer
- Test Power Supply
- Test CPU functionality
- Reset
- Oscillator
- Test I/O
- With multimeter
- With Software
- Test UART
- Test RS485
- Test RS485 Board communication
- Test SPI board communication
Expenses
- Estimation of expenses
- PCB sizes are also predicted
- In "PREDICTED COST" collumn: no VAT and no-stencil for PCBs
ITEM | DESCRIPTION |
DIMENSIONS | QUANTITY | COST FOR 1 | PREDICTED COST FOR 2 PCS |
PREDICTED TOTALS (FOR_2_PCS) |
1 | PCB CAR-Computer | 210 X 135 mm | 2 | - | 140 | |
2 | PCB CAR-CALLS | 150 X 100 mm | 2 | - | 100 | |
3 | PCB CAR-CALLS-EXPANDER | 100 X 100 mm | 2 | - | 100 | |
4 | PCB CAR-ISOLATOR | 70 X 70 mm | 2 | - | 60 | |
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PREDICTED PCB TOTAL NO VAT | |
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400 | 400 |
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QUOTED PCB TOTAL 2 PCBS |
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QUOTED PCB TOTAL 3 PCBS | |
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5 | PARTS CAR-COMPUTER | |
2 | 50 | 100 | |
6 | PARTS CAR-CALLS | |
2 | 35 | 70 | |
7 | PARTS CAR-CALLS-EXPANDER | |
2 | 25 | 50 | |
8 | PARTS CAR-ISOLATION | |
2 | 10 | 20 | |
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PARTS TOTAL FOR 2 |
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240 | 240 |
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PART TOTAL FOR 3 | |
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GRAND TOTAL | |
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640 |
Time Schedule
- KEY-DATES
- Start of Project: 26/9/2011
- Delivered PCBs and Components 25/10/2011
- End of project 28/11/2011
Development-Cost and Expenses for PCB and Parts
- Cost is 2850 E
- 1/3 payed at every KEY-DATE
Below are expenses not included in the 2850 E cost
Expenses estimation for --2-- prototype PCB sets --NO-STENCIL--
- Estimated Expenses are 640 E additionally (not included in the 2850 E cost)
- analyzed:
- For PCBs 400 E (no VAT)
- For Parts 240 E
- Based on [this table]
Expenses estimation for [3] prototype PCB sets + STENCILS
As the previous estimation was for 2 sets of boards and finally 3 sets + stencils needed:
- For 3 sets estimated 1086 E (including PCBs VAT 21%)
- Analyzed as:
- PCBs 600 E + 21% VAT = 726 E
- Parts 360 E
Expenses Final after PCBs and parts delivered
As the above was estimation, The final cost was 1115.23 E, Analyzed:
- PCBs 589.23 E
- Reduced due to price difference from 2 to 3 boards
- Include 3 Stencils
- Parts 526.00 E
- Increased due to tapes, minimum-order-quantities, One-week-delivery