Difference between revisions of "Porsche 928 LH Replacement Rev 2"
From Francois Louw
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| − | + | =To Do list = | |
Here is where I list all the mistakes I need to fix and the optimisations that needs to be done. This will focus primarily on the hardware side of the board because the software will in the end be 99% the same as the prototype version. | Here is where I list all the mistakes I need to fix and the optimisations that needs to be done. This will focus primarily on the hardware side of the board because the software will in the end be 99% the same as the prototype version. | ||
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*''Remove serial line'' | *''Remove serial line'' | ||
*''Add extra digital and analog inputs for engine mods'' | *''Add extra digital and analog inputs for engine mods'' | ||
| − | * | + | *''Add I2C/SPI interface for future expansion'' |
*''Add battery voltage analog line'' | *''Add battery voltage analog line'' | ||
*''Remove external EEPROM lines'' | *''Remove external EEPROM lines'' | ||
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*''Fix protection diodes'' | *''Fix protection diodes'' | ||
*''Add MAF-Burn function at engine shutdown'' | *''Add MAF-Burn function at engine shutdown'' | ||
| − | * | + | *''Add test-points'' |
| − | * | + | *''Add mounting holes'' |
*''Change to switching power supply'' | *''Change to switching power supply'' | ||
*''Change to surface mount protection diodes'' | *''Change to surface mount protection diodes'' | ||
*''Redo FET driver circuitry'' | *''Redo FET driver circuitry'' | ||
| + | *''Change serial port emulation to HID usb communication'' | ||
| − | + | =Updates done so far 1 April 2013= | |
| − | SO far I have done major reworking to the second revision of the PCB. All the changes that has been made are marked on the to do list. | + | SO far I have done major reworking to the second revision of the PCB. All the changes that has been made are marked on the to do list in ''italics'' and the still to be done is marked in '''bold'''. |
Most of the to do list is done. Here are a bit more detail on some of the changes that has been made. | Most of the to do list is done. Here are a bit more detail on some of the changes that has been made. | ||
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After more testing with prototypes I will make a batch of the next revision boards (around 10) and then text to make sure that there are no errors. | After more testing with prototypes I will make a batch of the next revision boards (around 10) and then text to make sure that there are no errors. | ||
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| + | =Upadtes 3 April 2013= | ||
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| + | Ok, so almost everything is done one the PCB. I require the pinout and PCB footprint of the 25pin connector for the S3 generation. | ||
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| + | I added mounting holes as well as an external bus that can be used for future communications with some other device (Hint, I am thinking of making a carputer that will plug in to the ECU directly) | ||
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| + | Also I need to find a replacement male/female connector set that I can use on the PCB. This will be useful if the connector of the harnass is worn out, and need to be replaced. | ||
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| + | I think I will try to find a connector that can fit on either the 25 or 35 pin footprint to make life easier. | ||
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| + | =Revised 20 Apr 2013= | ||
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| + | Of, here are a few of the things done: | ||
| + | |||
| + | *Board Shrinked | ||
| + | *Mounting Holes Added | ||
| + | *Battery Voltage Analog Signal | ||
| + | *FET Driver Schematic Updated | ||
| + | *Switching Power supply | ||
| + | |||
| + | Here is a low quality image of the layout. | ||
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| + | [[File:ECU2-PCB-2013-04-22.jpg]] | ||
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| + | Soon: 25 Pin connector and aftermarket connector. | ||
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| + | I have found good connectors from Phoenix Connectors that I like. I will be putting the footprint for a 32pin connector on the PCB sometime. I decided to use a 32pin connector because that suits my PCB layout the best. I will try to make the pinout as close as possible to the 25/34 pin layout to make the change easier. | ||
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| + | I shrank the board quite a bit. It is now 123mmx100mm. This will decrease the board cost and will make it easier to fit into aftermarket enclosures. I have found some really good enclosures for PCB up to 135mmx100mm. | ||
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| + | A change to surface mount protection diodes reduces the amount of through hole components that I need to solder on. | ||
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| + | A switching power supply is made because it will increase efficiency and lower the heat generated. I also dont need an intermediate voltage for the FET drives, meaning that I only need 12V and 3.3V rails. | ||
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| + | After the connectors are sorted then the PCB should be finished! | ||
