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electronics/README.md

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