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122 lines
3.7 KiB
Markdown
122 lines
3.7 KiB
Markdown
# Electronics
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## Bill of Materials (BOM)
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| Name | Thumbnail | Required |
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| -------------- | ----------------------------------------------------------------------- | -------- |
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| Raspberry Pi Zero W<br>or<br>Raspberry Pi Zero W 2 | <img src="./imgs/zero2-close-up.webp" alt="raspberry pi" width="300"/> | 1 |
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| body_bottom | <img src="./imgs/body_bottom.jpg" alt="body_bottom" width="300"/> | 1 |
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| body_side_wall | <img src="./imgs/body_side_wall.jpg" alt="body_side_wall" width="300"/> | 2 |
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| body_back_wall | <img src="./imgs/body_back_wall.jpg" alt="body_back_wall" width="300"/> | 1 |
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| battery_box | <img src="./imgs/battery_box.jpg" alt="battery_box" width="300"/> | 1 |
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| battery_holder | <img src="./imgs/battery_holder.jpg" alt="battery_holder" width="300"/> | 2 |
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## Connection Diagram
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### PCB
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Name | Thumbnail | Required | Note |
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-------- | --------- | -------- | ---- |
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main |  | 1 |
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sub |  | 2 | there is a difference (SJ1) between<br>the 2 PCB, refer to below
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### Components
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Name | Thumbnail | Required | Note |
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-------- | --------- | -------- | ---- |
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[Linkit 7697](https://labs.mediatek.com/zh-tw/platform/linkit-7697) | <img width=200 src='https://labs.mediatek.com/images/img_hdk_7697.png'/> | 1 |
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[mini360 DC-DC](https://www.aliexpress.com/w/wholesale-mini360-dc-dc.html) Buck voltage regulator |  | 7 | adjust to 5V
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[PCA9685](https://cdn-shop.adafruit.com/datasheets/PCA9685.pdf) (TSSOP28)|  | 2 | TSSOP28 |
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Resistor: 220 ohm (0805) | | 18 | SMD |
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Resistor: 10K ohm (0805) | | 12 | SMD |
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Resistor: 470 ohm (0805) | | 1 | SMD |
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LED: green or any color (0805) | | 1 | SMD |
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Capacitor: 10 uF (0805) | | 2 | SMD |
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14 pin 2.54mm female header | | 4 |
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4 pin 2.54mm female header | | 2 |
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6 pin 2.54mm female header | | 2 |
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4 pin 2.54mm 90 degress male header | | 2 |
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6 pin 2.54mm 90 degress male header | | 2 |
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4 pin 2.54mm male header | | 2 |
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3 pin 2.54mm male header (black) | | 6 |
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3 pin 2.54mm male header (yellow) | | 6 |
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3 pin 2.54mm male header (red) | | 6 |
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2 pin 2.54mm male header | | 1 |
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Jumper 2.54mm | | 1 |
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## PCB detail
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##### Software
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Please use **Eagle 7.7** software to open schematic files (main.sch/main.brd and sub.sch/sub.brd)
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Eagle 7.7 can be found at http://eagle.autodesk.com/eagle/software-versions/1
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Note.
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7.7 is an old and free version of Eagle.
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Latest Eagle is not free anymore unless you are students
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##### Manufacture
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There are a lot of online service that can manufacture PCB/PCBA for you (just google `PCB/PCBA`).
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Seeed (https://www.seeedstudio.io/fusion_pcb.html) is one of them.
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They also provide instructions of generating necessary Gerber files at http://support.seeedstudio.com/knowledgebase/articles/1176532-how-to-generate-gerber-file.
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### Main
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`main.brd`/`main.sch`
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##### Schematic
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Note.
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`MP2307` refer to mini360 DC-DC converter
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##### Layout
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##### PCB
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### Sub (x2)
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`sub.brd`/`usb.sch`
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> There is 1 difference between left and right PCB. The SJ1 of right PCB is left open, but `SJ1` of left PCB should be **closed**. (This is i2c address setting of PCB9865)
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##### Schematic
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Note.
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`MP2307` refer to mini360 DC-DC converter
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##### Layout
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##### PCB
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## Servo Connection
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Each leg of hexapod has 3 servos (body, thigh, foot), refer to below diagram for correct connection
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