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59 lines
2.3 KiB
Markdown
59 lines
2.3 KiB
Markdown
#### With USBvalve PCB
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<p float="left">
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<img src="https://github.com/cecio/USBvalve/blob/main/pictures/USB_valve_front.png" width="25%" height="25%" />
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<img src="https://github.com/cecio/USBvalve/blob/main/pictures/USB_valve_back.png" width="25%" height="25%" />
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</p>
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- place the Raspberry Pi Pico on the silk screen on the front
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- you don't need to solder all the PINs. Just the following:
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- D4 and D5 (left side)
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- GND (right side)
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- 3v3_OUT (right side)
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- the 3 DEBUG pin on the bottom: SWCLK, GND and SWDIO
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- place the 3D printer spacer or a piece of tape on the parts of the OLED that my touch the Raspberry
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- solder the OLED (with a header) on the 4 PIN space
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Some of the OLEDs have the GND and VCC PINs swapped, so I built the PCB to be compatible with both versions:
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For example if your OLED has GND on PIN1 and VCC on PIN2 like this:
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<img src="https://github.com/cecio/USBvalve/blob/main/pictures/usb_valve_oled.png" width="35%" height="35%" />
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You have to place a blob of solder on these two pads on the back of the PCB:
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<img src="https://github.com/cecio/USBvalve/blob/main/pictures/usb_valve_pads.png" width="15%" height="15%" />
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Otherwise you should the opposite and place the solder on the other PADs:
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<img src="https://github.com/cecio/USBvalve/blob/main/pictures/usb_valve_pads_2.png" width="15%" height="15%" />
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#### Without USBvalve PCB
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<img src="https://github.com/cecio/USBvalve/blob/main/pictures/pico-pinout.svg" alt="Pico Pi" width="85%" height="85%" />
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If you are using a breadboard or just wiring, all you have to do is to ensure to connect the proper PINs at the OLED screen.
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The mapping is the following:
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- PIN6 of Pi --> OLED SDA
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- PIN7 of Pi --> OLED SCL
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- PIN38 (GND) of Pi --> OLED GND
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- PIN36 (3V3OUT) of Pi --> OLED VCC
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If you want to use the DEBUG functions, you can also place a header on the 3 SWD PINs at the bottom of the board.
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### Flash Firmware
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To flash the firmware, follow these steps:
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- Connect the Raspberry Pi Pico with the USB cable, by keeping the *BOOTSEL* button pressed (the big white button on the board)
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- release the button
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- you will see a new drive on the system, named `RPI-RP2` (in Linux envs you may have to manually mount it)
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- copy the proper firmware file (with extension `uf2`) in the folder, depending on the OLED you used
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- wait few seconds until the mounted folder disappear
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It's done!
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