hexapod/electronics/README.md

# Electronics

## Connection Diagram

![connections](files/connections.jpg)

## Bill of Materials

### PCB

Name | Thumbnail | Required |
-------- | --------- | -------- |
main |           | 1 |
sub |           | 2 |

### Components

Name | Thumbnail | Required |
-------- | --------- | -------- |
[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 |
[mini360 DC-DC](https://www.aliexpress.com/w/wholesale-mini360-dc-dc.html) Buck voltage regulator | ![](files/mini360.png) | 7 |
[PCA9865](https://cdn-shop.adafruit.com/datasheets/PCA9685.pdf) (TSSOP28)| ![](files/pca9865.png) | 2 |
Resistor: 220 ohm (0805) | | 18 |
Resistor: 10K ohm (0805) | | 12 |
Resistor: 470 ohm (0805) | | 1 |
LED: green or any color (0805) | | 1 |
Capacitor: 10 uF (0805) | | 2 |
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

> Please use 'Eagle' software to open below schematics

### Main

![main_sch](files/main_sch.png)
![main_brd](files/main_brd.png)

### Sub (x2)

> 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)

![sub_sch](files/sub_sch.png)
![sub_brd](files/sub_brd.png)


## Servo Connection

![servo_conn](files/servo_conn.jpg)