Raspberry Pi Robot HAT Part 3

Design of the Raspberry Pi Robo HAT.

In the first video I looked at the list of requirements then created schematics for the Raspi header, the ID_EEPROM, MPU6050 and the PCA9685. In last video, I look at the rest of the parts I need on the first board. In this video I look at all the components of the daughter board to complete the list of requirements.

This is a wish list in order of most important to least. Most of my robots don't have much spare room, so I needed to get as much as possible that is useful onto the board. Items at the top of the list must be present, while items near the bottom of the list are optional.

1. Conforms to the Raspberry Pi Foundations specifications for a Hardware Attached on Top (HAT).
2. Provision for a 4 pin head to supply 5V, Gnd, I2C_SCL and I2C_SDA that is 5V tollerant.
3. Contains a MPU6050 Inertial Measurement Unit (IMU).
4. Contains a PCA9685 16 channel LED/Servo driver.
5. Servo power supply MUST be seperate to the Raspi and other IO power.
6. Contains 4 or more INA219 current sensors.
7. Contains 2 ADS1115 4 channel 16 bit Analog Input Devices.
8. Contains 1 MPR121 12 channel capacitive touch sensor.
9. Contains 1 PCF8574 8 channel digital IO expander.

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I have a number of Play-Lists that may also interest you: Spot Micro build using MRL https://youtube.com/playlist?list=PLgXTfFM40HqF6YqVjWtEtDC-ekbIkpkyE Fred's modified Inmoov Robot Head created in the Fred's Head Series. https://www.youtube.com/playlist?list=PLgXTfFM40HqEbnFfhaLPmLv_RS1ZRCilI Fred's Head, a better stand. (This series) https://youtube.com/playlist?list=PLgXTfFM40HqHV5EPKPULJDfbuXK1KUeeS The Inmoov Walking Robot Series. https://youtube.com/playlist?list=PLgXTfFM40HqEMwg9rJ078INRYWDCG66B3 Fred's Static Leg build and attach series, now finished. https://youtube.com/playlist?list=PLgXTfFM40HqHhaHpmX4HQO9xJAz-pAsOm The Creality CR10S5 3D Printer Series. https://youtube.com/playlist?list=PLgXTfFM40HqH2fJ3Wsu2wX90h1_V4uI5n The Cocoon Create Touch 3D Printer Series. https://youtube.com/playlist?list=PLgXTfFM40HqHJlvRuSbhYUvdWBraW9tri My Industrial videos. https://youtube.com/playlist?list=PLgXTfFM40HqFNvDBGjblVrEkl3jrQKMDE And finally some of my unboxing videos. https://youtube.com/playlist?list=PLgXTfFM40HqFXHXRLBa9tsLhRQGcORZQO

See you in the next video :-). ... https://www.youtube.com/watch?v=HlkmalSqdts