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Merged
thejpster merged 3 commits into from
Dec 11, 2022
Merged

Upated some instructions #157

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9abc7ac
Some clarifications in the instructions.
NollKollTroll Dec 11, 2022
e991184
Merge branch 'Neotron-Compute:develop' into develop
NollKollTroll Dec 11, 2022
ae8d846
Note about fitting jumpers.
NollKollTroll Dec 11, 2022
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16 changes: 13 additions & 3 deletions ASSEMBLY.md
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Expand Up @@ -37,13 +37,16 @@ The Neotron Pico kit does assume you can solder at an intermediate level. If you

## The Interactive Bill of Materials

The best way to fit the components to your PCB is to use the Interactive Bill of Materials (also known as the IBOM). This is a web-page with a diagram of the PCB and a list of all the components. As you click a component it is highlighted on the PC. Conversely, if you click on the diagram, the relevant component is highlighted in the table. Do ensure you click the *"Sourced"* checkbox when you have determined you have the part in stock, and that you click the *"Placed"* checkbox when the component has been fitted. If your PCB was supplied with some parts already fitted, tick those off now.
The best way to find where to fit the components to your PCB is to use the Interactive Bill of Materials (also known as the IBOM). This is a web-page with a diagram of the PCB and a list of all the components. As you click a component it is highlighted on the PC. Conversely, if you click on the diagram, the relevant component is highlighted in the table. Do ensure you click the *"Sourced"* checkbox when you have determined you have the part in stock, and that you click the *"Placed"* checkbox when the component has been fitted. If your PCB was supplied with some parts already fitted, tick those off now.

The IBOM file can be found by clicking the Releases shortcut available to the right on the GitHub page, or downloading it directly: [IBOM v1.1.0](https://github.com/Neotron-Compute/Neotron-Pico/releases/download/v1.1.0/neotron-pico-v1.1.0-ibom.html). Open the saved file in a browser.

## But what order should I fit things in?

The general rule is to fit the parts with the lowest Z-height first (i.e. the flat ones, that stick out the least). This means if you flip the PCB over to solder on the underside, you won't have a tall component preventing the board from lying flat and causing the component you are currently trying to solder to fall out of its hole. A suggested order is:

* All surface mount components (including U401, which may not have been presoldered in your kit)
* U401 has a line to the left of the chip which should correspond to the line to the left of the PCB foot print
* Short-circuit JP1201 *or* JP1201
* If you have a DS1307 short JP1201 to give it 5V
* If you have an MCP7940, short JP1202 to give it 3.3V
Expand All @@ -54,8 +57,15 @@ The general rule is to fit the parts with the lowest Z-height first (i.e. the fl
* The PSU module (U1301)
* The Raspberry Pi Pico (if you want to solder it straight to the board) (U201)
* Any 2.54mm pin headers and jumpers
* Don't worry about J906, J907 and J908 - they're just for debugging/testing/probing
* Ensure you leave out pin 8 on the J802 PC case audio connector, as most cases have a blank position on the mating connector to make sure you can't put it in backwards. Pin 8 is the top row, one in from the right; if you look carefully it's the only pad on that 10-way header that doesn't have a PCB trace running to it.
* Don't worry about J906, J907 and J908 - they're just for debugging/testing/probing. It's easier to put an oscilloscope probe directly into a hole.
* Ensure you leave out pin 8 on the J802 PC case audio connector, as most cases have a blank position on the mating connector to make sure you can't put it in backwards. See *Not using a PCB Case* if you don't actually connect this header to your ATX case, as you'll need to fit some jumpers<p>
```
. +----+----+----+----+----+
. | 2 | 3 | 6 | X | 10 |
Case +----+----+----+----+----+
Comment thread
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. | 1 | 4 | 5 | 7 | 9 |
. +----+----+----+----+----+
```
* Any 2.54mm pin sockets (e.g. for the Raspberry Pi Pico, if you didn't solder it down directly earlier)
* The Expansion Connectors (J902, J903, J904, J905)
* The VGA Connector (J401)
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4 changes: 4 additions & 0 deletions README.md
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Expand Up @@ -462,6 +462,10 @@ Unless you explicitly state otherwise, any contribution intentionally submitted
* Microchip MCP7940N Real-Time Clock
* Info Page: <https://www.microchip.com/wwwproducts/en/MCP7940N>

## Assembly instructions

See [ASSEMBLY.md](./ASSEMBLY.md) for instructions on how to assemble the board.

## How hard is this to solder?

Typically, I get the boards from JLCPCB with most of the surface-mount components already fitted. This includes all the LEDS, small inductors, resistors and small capacitors (all 0805 size), the transistors (all SOT-23), and whichever of the larger ICs they happen to have in stock. All that's left is the larger ICs, and the through-hole connectors.
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