# Electronics ## Bill of Materials (BOM) | Name | Thumbnail | Required | | -------------- | ----------------------------------------------------------------------- | -------- | | Raspberry Pi Zero W
or
Raspberry Pi Zero W 2 | raspberry pi | 1 | | body_bottom | body_bottom | 1 | | body_side_wall | body_side_wall | 2 | | body_back_wall | body_back_wall | 1 | | battery_box | battery_box | 1 | | battery_holder | battery_holder | 2 | ## Connection Diagram ![connections](files/connections.jpg) ### PCB Name | Thumbnail | Required | Note | -------- | --------- | -------- | ---- | main | ![main](files/main_pcb_s.jpg) | 1 | sub | ![sub](files/sub_pcb_s.jpg) | 2 | there is a difference (SJ1) between
the 2 PCB, refer to below ### Components Name | Thumbnail | Required | Note | -------- | --------- | -------- | ---- | [Linkit 7697](https://labs.mediatek.com/zh-tw/platform/linkit-7697) | | 1 | [mini360 DC-DC](https://www.aliexpress.com/w/wholesale-mini360-dc-dc.html) Buck voltage regulator | ![](files/mini360.png) | 7 | adjust to 5V [PCA9685](https://cdn-shop.adafruit.com/datasheets/PCA9685.pdf) (TSSOP28)| ![](files/pca9685.png) | 2 | TSSOP28 | Resistor: 220 ohm (0805) | | 18 | SMD | Resistor: 10K ohm (0805) | | 12 | SMD | Resistor: 470 ohm (0805) | | 1 | SMD | LED: green or any color (0805) | | 1 | SMD | Capacitor: 10 uF (0805) | | 2 | SMD | 14 pin 2.54mm female header | | 4 | 4 pin 2.54mm female header | | 2 | 6 pin 2.54mm female header | | 2 | 4 pin 2.54mm 90 degress male header | | 2 | 6 pin 2.54mm 90 degress male header | | 2 | 4 pin 2.54mm male header | | 2 | 3 pin 2.54mm male header (black) | | 6 | 3 pin 2.54mm male header (yellow) | | 6 | 3 pin 2.54mm male header (red) | | 6 | 2 pin 2.54mm male header | | 1 | Jumper 2.54mm | | 1 | ## PCB detail ##### Software Please use **Eagle 7.7** software to open schematic files (main.sch/main.brd and sub.sch/sub.brd) Eagle 7.7 can be found at http://eagle.autodesk.com/eagle/software-versions/1 Note. 7.7 is an old and free version of Eagle. Latest Eagle is not free anymore unless you are students ##### Manufacture There are a lot of online service that can manufacture PCB/PCBA for you (just google `PCB/PCBA`). Seeed (https://www.seeedstudio.io/fusion_pcb.html) is one of them. They also provide instructions of generating necessary Gerber files at http://support.seeedstudio.com/knowledgebase/articles/1176532-how-to-generate-gerber-file. ### Main `main.brd`/`main.sch` ##### Schematic ![main_sch](files/main_sch.png) Note. `MP2307` refer to mini360 DC-DC converter ##### Layout ![main_brd](files/main_brd.png) ##### PCB ![main_pcb](files/main_pcb_l.jpg) ### Sub (x2) `sub.brd`/`usb.sch` > 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) ##### Schematic ![sub_sch](files/sub_sch.png) Note. `MP2307` refer to mini360 DC-DC converter ##### Layout ![sub_brd](files/sub_brd.png) ##### PCB ![sub_pcb](files/sub_pcb_l.jpg) ## Servo Connection Each leg of hexapod has 3 servos (body, thigh, foot), refer to below diagram for correct connection ![leg](files/leg.png) ![servo_conn](files/servo_conn.jpg)