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53 lines
3.1 KiB
Markdown
53 lines
3.1 KiB
Markdown
# Making some yourself
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Making some exixe modules yourself is fairly straightforward, just order the PCBs and parts and solder them together. Since the component count is not small and they are densely populated, I suggest order the PCB in panels of 6 or 8 and get a matching stencil to apply the paste. Use of reflow oven or skillet reflow is also recommended, since soldering each and every component by hand is basically torture.
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Full BOM here: [exixe12](resources/exixe12_bom.xlsx), [exixe14](resources/exixe14_bom.xlsx)
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* The NPN transistor used on every cathode is [BF820](https://www.mouser.co.uk/Search/ProductDetail.aspx?R=BF820W%2c135virtualkey66800000virtualkey771-BF820W135)
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* The single PNP transistor used in overdrive circuit is [MSB92](https://www.mouser.co.uk/Search/ProductDetail.aspx?R=MSB92ASWT1Gvirtualkey58410000virtualkey863-MSB92ASWT1G)
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* Microcontroller is [STM32F042K6T6](https://www.mouser.co.uk/Search/ProductDetail.aspx?R=STM32F042K6T6virtualkey51120000virtualkey511-STM32F042K6T6)
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* LED is [Wurth Electronics 150141M173100](https://www.mouser.co.uk/Search/ProductDetail.aspx?R=150141M173100virtualkey51100000virtualkey710-150141M173100)
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## Upload Firmware
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Once you have soldered the board together, you will need to upload the firmware to the STM32 microcontroller in order for the boards to function.
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To do that you need a ST-Link V2 programmer. Just search "ST-Link V2" on ebay, they are dirt cheap (around $3). It should look like this:
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Then go and download the free STM32 ST-LINK Utility from the official ST website:
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http://www.st.com/en/development-tools/stsw-link004.html
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Click "get software" at the bottom of the page, then provide a name and email to get the download link. Use a fake name and a burner email like [this one](https://slippery.email/) to avoid spams.
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The ST-LINK Utility will install the driver for the programmer automatically. After which you can connect the programmer to the exixe board:
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* `GND` to `GND`
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* `3.3V` to `3V`
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* `SWDIO` to `DIO`
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* `SWCLK` to `CLK`
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After the board is connected to the programmer, plug the programmer into the USB port, then open the ST-LINK Utility. Click the button indicated below to connect to the microcontroller:
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If your solder job is good, the ST-LINK Utility should be able to connect to the STM32 and show the content of its internal memory:
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If the chip is brand new, everything shoud be 0xff. Anyway, click Target -> Program:
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Then select the HEX file that you want to use, [exixe12](/firmware/exixe12/exixe12.hex) [exixe14](/firmware/exixe12/exixe14.hex):
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Then click start to upload the firmware:
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That's pretty much it if you don't want to recompile the firmware. If you do however you'll need to download the [Keil MDK](https://www.keil.com/demo/eval/arm.htm), it's slightly more involved, and I'll write a tutorial if interest arises. |